WikiPortallus: Chevrolet Corvair.html

The Chevrolet Corvair is a compact, six passenger automobile produced by the Chevrolet division of General Motors for the 1960–1969 model years. The Corvair is the only American made, mass-produced passenger car to feature a rear-mounted engine. The Corvair engine, an air-cooled, horizontally-opposed, aluminum six-cylinder produced 80 hp (60 kW) in 1960, but later versions produced as much as 180 hp (134 kW). A proposed Pontiac version, the Polaris, was never built; the more conventional Tempest was produced instead. The Corvair was intially marketed as a family economy sedan, but with the mid-1960 introduction of the Monza, a five-passenger coupe with bucket seats, the Corvair found a new sporty-car niche, and in 1964 influenced Ford to produce the Mustang. The Corvair Monza Spyder and later Corsa models were among the first American cars to offer a turbocharged engine. The nameplate was also offered as a passenger compact van called the Greenbrier, and commercial vehicles were also initially offered; the "Corvan 95" panel van and two versions of a two-door pickup truck.¹

Compact

The Corvair — like the Ford Falcon and the Plymouth Valiant— was one of the first entries of a new compact car class. These new models were offered in response to the small, fuel-efficient automobiles being imported from Europe by Volkswagen, Renault and others. Unlike the Falcon and Valiant nameplates, whose conventional designs tended to attract customers from the profit-driving full-size models from their respective manufacturers,²the Corvair's un-conventional design drew customers from makes such as Volvo and VW, as well as from the Rambler.³ Because such customers had not been likely to contemplate a larger Chevrolet Biscayne, most Corvair sales did not translate into lost Biscayne sales. Corvair sales were almost entirely "new business" for Chevrolet. Other compacts such as the Chevy II/Nova, Pontiac Tempest, and later subcompact Chevrolet Vega — were smaller versions of conventional automobiles with front-mounted, water-cooled inline engines.

History

Origin 1956

The Corvair name originated in 1954 as a Corvette fastback show car. Several Chevrolet concept cars of the period, including the Nomad were based on Chevrolet's sports car.⁴ The Corvair was championed by Ed Cole, holding chief engineer and general manager positions at Chevrolet in the 1950s. As the first American response to the growing popularity of small, lightweight imported cars, design began in 1956 with the first vehicles rolling off the assembly line in late 1959 for the 1960 model year. Two Corvairs were tested at the Riverside International Raceway in Riverside, California for 24 hours. One car rolled over, but the other completed the drive using only one quart (0.95 L) of oil.⁵ The Corvair was introduced to the public early in 1960 at the Hal Roach Studios as actress Shirley Bonne unveiled the first model.

Overview

The Corvair was a relatively successful model for Chevrolet, with annual unit sales exceeding 200,000 its first six years. Chevrolet deliberately designed it as a radical departure from the conventional Chevrolet. The rear engine design offered enormous packaging and economy advantages, providing the car with a lower silhouette, flat passenger compartment floor, obviating the need for power assists, reducing the need for air conditioning (due to the absence of engine heat blowing over the passenger compartment), and offering dramatic improvements in ride quality, traction, and braking balance. The radically different design also attracted customers from other makes, primarily imports. This was an important, and often under-emphasized, cause of the Corvair's success.⁶The Corvair stood out with engineering significantly different from other American offerings. It was part of GM's innovative Y-body ("Z"-Body from 1965 on) line of cars, and by far the most unusual, due to the location and design of its engine; a rear engine-rear wheel drive layout, like the VW Type 1 and Porsche 911. The 1948 Tucker Torpedo (51 produced), had also used this layout to mixed reviews.

The Corvair's powerplant is an aluminum air-cooled 140 in³ (2.3 L) flat-6. The first Corvair engine produced 80 hp (60 kW). Power peaked with the 1965-66 turbocharged 180 hp (134 kW) Corsa engine option. The first generation model's swing axle rear suspension, invented and patented by engineer Edmund Rumpler, offered a comfortable ride but raised safety concerns associated with the car's handling stability, and was replaced in 1965 with a fully independent rear suspension similar to the Corvette Sting Ray.

The Corvair represented a breakthrough in unibody construction for mass-produced Detroit vehicles, the most successful automobile of this type up to that time, with 1,786,243 cars being produced between 1960 and 1969⁷⁸. The Corvair was built from uniform molds and relied on the shaping of the glass and doors for help with structural integrity⁹. Convertible versions had special supports welded underneath to compensate for the lack of a steel roof.

End of the Corvair 1969

A variety of factors contributed to the Corvair's sales to plummet after 1965. Safety issues had been raised in "The Sporty Corvair" chapter of Ralph Nader's book Unsafe at Any Speed.¹⁰ in which the 1960-63 Corvair was used as a dramatic case study. Nader asserted a greater tendency of loss of driver control, spin-out and even roll-over due to the car's swing axle design rear suspension. Published in 1965, it contributed to falling Corvair sales, although to what degree is not known. Development & Engineering changes where halted in 1966 on the year-old, redesigned second-generation cars with only Federally-mandated emissions and safety changes made therafter through the final 1969 models.

According to noted GM historian Dave Newell, Chevrolet had already planned on ceasing Corvair production after the 1966 model year. Nader's book turned out to be an inconvenience. Not wanting to appear to be buckling to Nader's pressure, Corvair production was continued for another three years. The Corvair had faced increasing competition from the Ford Mustang, Chevy's own Camaro, and other "pony cars", in — ironically, a market pioneered by the Corvair Monza; The Corvair had been costly to produce yet was not offered at a premium price. (not a high profit earner for Chevrolet as was the Corvette, for instance); A declining lack of interest from the company, especially Chevrolet's General Manager John DeLorean and a complete absence of Corvair advertising after 1967, confirmed Chevrolet's initial plans, and reflected the company's priorities including promotion of three redesigned models for 1968 — the Corvette, Chevelle and Chevy II Nova.

In its final years the Corvair was referred to as "the phantom" by one auto magazine, and Chevrolet's 1969 Corvair four-page brochure was "by-request-only." An indication of the Corvair's imminent demise was when the 1969 models were introduced: GM equipped all of its 1969 models one year ahead of government requirements, with a steering column-mounted, anti-theft ignition switch, and a new, square-shaped ignition key. All except the Corvair. It got the new key but was the only GM car to retain the dashboard ignition switch. That final year only 6000 cars were produced. Cars from November 1968 through May 1969 were virtually hand-built by a dedicated Corvair team in an off-line area of the assembly plant as to produce more Novas (built at the same plant) to keep up with the increased demand.

Generations

First generation (1960-1964)

The 1960 Corvair 500 and 700 series four-door sedans were conceived as economy cars offering few amenities in order to keep the price competitive, with the 500 (base model) selling for under $2,000. Powered by an 80 hp (60 kW) engine and three speed manual or two speed Powerglide automatic transmission, the Corvair was designed to have comparable acceleration to the six-cylinder full-size Chevrolet Biscayne. Introduced in January 1960, two-door models have a fold-down rear seat for added storage capacity, which was greatly needed as the spare tire was stowed in the forward trunk compartment. The passenger compartment was heated by a gasoline heater mounted next to the spare tire in the luggage compartment. While it offered immediate hot air, customers complained of what they thought might be decreased gas milage on cold days and through long winters. Chevrolet redesigned the heating system for the 1961 model year, yet left it up to customers to choose the gas heater until the end of the 1964 model year. The line quickly grew from utilitarian bench seat sedans and coupes to the more plushly appointed bucket seat interiors of the new 900 series Monza. It hit showroom floors in the Spring 1960. Two available options on Monza were a more powerful engine, rated at 95 hp (71 kW) thanks to a more radical camshaft paired with low-restriction exhaust, and the introduction of a fully synchronized four speed transmission. Despite its late introduction, the Monza sold 12,000 units, making it one of the most popular Corvairs.

The 1961 Monza was heavily promoted and sometimes referred to as "The poor man's Porsche." The Monza series expanded with a four-door sedan body style in addition to the two-door coupe, and garnered about 144,000 sales.

A station wagon body-style, the Lakewood was added to the lineup in 1961 which has the flat-6 engine under the cargo floor. It contains a total of 68 ft³ (1.9 m³) of cargo room — 58 in the main passenger compartment, and another 10 in the "trunk" under the hood. For 1961 an optional four-speed manual transmission was added. The Corvair engine received its first size increase to 145 in³ courtesy of a slight increase in bore size. The base engine was still rated at 80 hp (60 kW) when paired with the manual transmissions and 84 hp (63 kW) when mated to the optional automatic transmission in Monza models. The high-performance engine was rated at 98 hp (73 kW). To increase luggage capacity in the front the spare tire was relocated to the engine compartment in cars not ordered with All Weather air conditioning and the gasoline heater was replaced by a system of ducts that redirected warmed air from the cylinder heads to the passenger compartment. The gasoline heater remained available as an option through 1964. Corvair was the first of the compacts to offer factory air conditioning, as a mid 1961 option introduction. The large condenser lay flat atop the horizontal engine fan. A large, green painted reverse rotation version of the standard GM Frigidaire air conditioning compressor was used, and an evaporator housing was added under the dash with integrated outlets surrounding the radio housing. All Weather Air Conditioning was not available on wagons, Greenbrier/Corvair 95, or the turbocharged models introduced later due to space conflicts in those models. Chevrolet also introduced the Corvair 95 line of light-duty trucks, which used the Corvair driveline and are forward-control, with the driver sitting over the front wheels, as in the Volkswagen Type 2.

The Greenbrier Sportswagon uses the same body as the "Corvan 95" panel van with the side windows option, but was marketed as a station wagon and was available with trim and paint options similar to the passenger cars, arguably making it the first American minivan. The "Corvan 95" model was also built in pickup versions; the Loadside was a fairly typical pickup of the era, except for the rear engine, forward controls, and a pit in the middle of the bed. The popular Rampside, which, as its name implies, has a large fold-down ramp on the side of the pickup bed. Rampsides were used by the Bell System because of the ease with which cable reels could be rolled in and out of the bed. Fleet sales of Corvair commercial vehicles were poor however, due to an approximately $100 premium over competitive Ford products: If 25 trucks were bought, essentially one Ford was had for free. This disadvantage contributed in the line to be discontinued.

In 1962, Chevrolet introduced the 150 hp (112 kW) turbocharged Monza Spyder option for Monza coupes and convertibles mid year, making the Corvair one of the first two production automobiles to come with a turbocharger as a factory option, with the Oldsmobile F-85 Turbo Jetfire of the same year. The 500 station wagon was dropped in favor of the Monza wagon at introduction, however all station wagons were discontinued mid year in favor the new Corvair Convertible and Chevy II (built at the same assembly plant). Self adjusting brakes were new for 1962. Metallic brake linings and a heavy duty suspension consisting of a front anti roll bar, rear axle limit straps, revised spring rates and recalibrated shock absorbers were introduced as optional equipment. The Monza Spyder features a multi-gauge instrument cluster which includes a tachometer, cylinder head temperature and intake manifold pressure gauges, Spyder fender script and Turbo logo deck emblems in addition to the high performance engine.

The Monza Coupe was the most popular model with 151,738 produced out of 292,531 total Corvair passenger car production for 1962.

The 1963 model year saw the availability of a long 3.08 gear for improved fuel economy, but the Corvair otherwise remained largely carryover with minor trim and engineering changes. The Loadside pickup was discontinued at the end of the model year.

For 1964 significant engineering and safety changes occurred, while the model lineup remained relatively unchanged. The engine displacement was increased from 145 to 164 in³ (2.3 to 2.7 L) due to an increase in stroke; the base engine power increased from 80 to 95 hp (60 to 70 kW), and the high performance engine increased from 95 to 110 hp (70 to 80 kW). The Spyder engine rating remained at 150 hp (112 kW) despite the displacement increase of the engine. 1964 saw an improvement in the car's swing axle rear suspension; a transverse leaf spring was added in an effort to diminish rear roll stiffness and foster more neutral handling attributes in addition to supporting a high proportion of the engine weight. Spring rates could now be softer at both ends of the car compared to previous models. The heavy duty suspension was no longer optional, although all models now had a front anti-roll bar as standard. Brakes were improved with finned rear drums. The remaining pickup, the Rampside, was discontinued at the end of the model year.

Second generation (1965-1969)

A dramatic redesign of the Corvair came in 1965. The new body showed influence from the Corvette Stingray and the 1963 Buick Riviera. The mild "coke bottle styling" set the trend for GM cars for the next fifteen years, foreshadowing the 1967 Camaro. For the first time, none of the passenger cars had a "B" pillar, making all closed models true hardtops. The second generation's styling was rated timeless when new, and considered contemporary today in comparison to the first generation. A new fully independent suspension, similar in design to the Corvette, replaced the original swing axle rear suspension.

Car and Driver magazine's David E. Davis Jr. showed enthusiasm for the 1965 Corvair in their October 1964 issue:

"And it is here too, that we have to go on record and say that the Corvair is - in our opinion - the most important new car of the entire crop of '65 models, and the most beautiful car to appear in this country since before World War II." "When the pictures of the '65 Corvair arrived in our offices, the man who opened the envelope actually let out a great shout of delight and amazement on first seeing the car, and in thirty seconds the whole staff was charging around, each wanting to be the first to show somebody else, each wanting the vicarious kick of hearing that characteristic war-whoop from the first-time viewer." "Our ardor had cooled a little by the time we got to drive the cars - then we went nuts all over again. The new rear suspension, the new softer spring rates in front, the bigger brakes, the addition of some more power, all these factors had us driving around like idiots - zooming around the handling loop dragging with each other, standing on the brakes - until we had to reluctantly turn the car over to some other impatient journalist...The '65 Corvair is an outstanding car. It doesn't go fast enough, but we love it."

The base 95 hp (71 kW) and optional 110 hp (82 kW) engines were carried forward from 1964. The previous 150 hp (112 kW) Spyder engine was replaced by the normally-aspirated 140 hp (104 kW) for the new Corsa. The engine was unusual in offering four single-throat carburetors, to which were added larger valves and a dual exhaust system; The 180 hp (134 kW) turbocharged engine was optional on the Corsa, which offered either standard three-speed or optional (US$92) four-speed manual transmissions.¹² The 140 hp (104 kW) engine was optional on 500 and Monza models with manual or Powerglide transmissions.

Many new refinements appeared on the beautiful¹³ new 1965 redesign. The Corsa came standard with an instrument panel featuring a 140 mph (230 km/h) speedometer with resettable trip odometer, a 6,000 rpm tachometer, cylinder head temperature gauge, analog clock with a sweeping second hand, a manifold vacuum/pressure gauge and fuel gauge. A much better heater system, larger brakes borrowed from the Chevelle, a stronger differential ring gear, a Delcotron alternator (replacing the generator), and significant chassis refinements were made. AM/FM stereo radio, in-dash All Weather Air Conditioning, telescopically adjustable steering column, and a Special Purpose Chassis Equipment ("Z17") handling package, consisting of a special performance suspension and quick ratio steering box, were significant new options for 1965.

By this time, the station wagon, panel van, and pickup body styles had all been dropped and 1965 would be the last year for the Greenbrier window van, which was retained mainly for fleet orders, with 1528 being built. In all, 235,528 Corvairs were built in 1965.¹⁴ Chevrolet replaced the Corvair-based vans with the Chevrolet Sportvan/GMC Handi-Van, which used a traditional front engine/rear drive axle borrowed from the Chevy II.

The 1966 lineup remained essentially unchanged from 1965. One change of note was a more robust 4 speed synchromesh transmission using the standard Saginaw gear set with 3.11:1 first gear ratio used by other GM 6 cylinder vehicles. The new 3 and 4 speed transmission was capable of handling more stress. It was a great improvement over the older 3 speed transmission, having a synchronized first gear. A flexible plastic air dam ("spoiler") was installed below the front valence panel to conceal the front suspension and underbody, and lessen crosswind sensitivity. The '66-'69 lenses protrude further from the bezels, and the backup light is less obvious, located inside the inboard lens. In front, The Monza emblem was changed from red to blue and featured a shorter bar. The Corvair script nameplate was moved further down next to the driver's side headlight bezel.

Sales began a decline as a result of Nader's book and the new Mustang that offered V8s up to 271 hp (202 kW) compared to Corvair's 180 hp (130 kW) top powertrain.¹⁵ and rumors of the upcoming "Panther'- the code name for the forthcoming Camaro, slated as a direct competitor for the Mustang. A decision was made to discontinue further development of the Corvair. Production for the model year was down to 103,743.¹⁶

In 1967, the Corvair line was trimmed to the 500 and Monza Hardtop Coupes and Hardtop Sedans, and the Monza Convertible. This model year was the first with true a collapsible steering column. A Dual circuit master cylinder with warning light, nylon reinforced brake hoses, stronger steel (instead of aluminum) door hinges, "mushroomed" instrument panel knobs and a vinyl edged day/night mirror were all made standard equipment. Although taillight lenses were fabricated from the 1966 molds, the "wedding band" chrome trim ring inside each lens was thicker (this detail can trip up even the most knowledgeable Corvair aficionado), and this change was carried through to the end of production. Chevrolet introduced a 50,000-mile (80,000 km) engine warranty on all Chevrolet models including the Corvair. Chevrolet was still actively marketing the Corvair in 1967, including color print ads and an "I Love My Corvair" bumper sticker campaign by dealers, but production and sales continued to fall off drastically. Only 27,253 copies were built.¹⁷

In 1968, the four-door hardtop was discontinued, leaving three models; the 500 and Monza Hardtop Coupes and the Monza Convertible. All Weather air conditioning was dropped as an option, due to concerns about thermal loading added by the now-standard Air Injection Reactor ("smog pump") which probably hurt sales as factory air became more popular generally in automobiles. The GM multiplex stereo system was also discontinued when new units changed wiring adapters; the Corvair's 9-pin connector would no longer fit the new units. Additional safety features, including side marker lights, and shoulder belts for closed models, were fitted per the federal government's requirements. All advertising was virtually stopped and sales were down to 15,400.

The final model-year 1969 Corvairs were assembled with the Nova in Willow Run, Michigan, the same facility Corvairs had been built from the beginning. Demand for Novas was high and a decision was made in November 1968 to move Corvair assembly to a special off-line area in the plant, dubbed the "Corvair Room", making Corvairs produced between that time and May 14, 1969 essentially hand-built by a dedicated Corvair team. Assembled bodies arrived from Fisher Body and awaited assembly in the off-line area. A number of collectors and GM executives expressed interest in purchasing the last Corvair, number 6000, but GM management decided that the Olympic Gold Monza hardtop would not be sold. Representatives from the press, along with corporate execs were present at the small ceremony when car number 6000 got its final fittings and drove off the line to the railroad cars with Novas (and a few Corvairs) ready for dealer shipment. It was not loaded on to a railroad car, however. Some accounts state the car was driven to the roof of the facilty parked with a few other Corvairs reserved for testing and later scrapped; some claim it went to a GM executive; the car has never surfaced. Reaction to the death of the Corvair was mixed, from sadness and regret such a fine car could not survive in the marketplace, to sharp criticism of Chevrolet's decision they had continued building the car. GM's policy has always been to forbid non-employees from photographing in their assembly plants. The Corvair was the the exception as CBS TV did a short story on the last models, with reporter Mike Pappas on-site at Willow Run when car #6000 was driven off the final assembly line.

Stillborn Corvair

Chevrolet had a proposed 1970-on model Corvair, essentially a re-skin of the 1965-69 model with new exterior sheetmetal. The overall appearance of stillborn third generation Corvair was very similar to the 1973 GM A Body intermediates—particularly the 1973 Pontiac Grand Am. It retained Corvair proportions, with a rounded sweeping body, terminating in a tapered tail with a glassy roof, featuring fixed quarter windows. This program progressed past the point of full scale clay models before being dropped in early 1968. One interesting project at GM was the Turbo Hydramatic 350 transmission, introduced in the 1968 Camaro and later adopted by most Chevrolet models. It was laid out in a manner that would've permitted its use in the Corvair, unlike the Turbo Hydramatic 400. Had the 1970-on Corvair been built, it is clear this transmission would have been adapted for the Corvair.

Criticisms

Handling (1960-1963 models)

Although the Corvair was a competent handling vehicle as delivered from the factory.." The average buyer more accustomed to front-engined cars, did not take account the car's different handling characteristics."¹⁸ Due to the swing axle design the rear tires would undergo large camber changes during fast cornering. These characteristics were quite similar to many imported cars, such as Mercedes and Volkswagen, which also used swing axle rear suspensions with similar handling attributes.

The criticism of the 1960-'63 Corvair handling was not entirely groundless as some cost-cutting was applied to these early Corvair models, specifically, the lack of an anti-roll bar. Chevrolet had considered adding a front anti-roll bar for the original 1960 car, which would have shifted a significant part of the weight transfer to the front outboard tire and reduced the rear slip angles considerably in severe cornering. Unfortunately, Chevrolet decided that the extra cost ($6 per car is often cited), with the confidence in tire pressures adequately compensating for the inclination for oversteer- led them to delete the front anti–roll bar from production models. They used different recommended low front and high rear tire pressures to combat the oversteer. As the Corvair was designed to avoid terminal oversteer by using very low air pressure in the front tires, typically 15 to 19 pounds per square inch (100 to 130 kPa), so that they would begin to understeer (increase slip angles faster than the rear) before the swing axle oversteer would come into play, this pressure was quite adequate for the very light-weight Corvair front end on the relatively wide (6.50-13) tires. However owners and mechanics, either through ignorance of the necessity for this pressure differential between front and rear or thinking that the pressure was too low for the front, would frequently inflate the front tires to current "average" pressures. If this pressure difference was not maintained, in very hard cornering, the rear slip angles would exceed the front slip angles, and could lead to oversteer at high speeds. The anti–roll bar did become available as an option in 1962, and was finally made standard in 1964.

Although much is said about jacking (tendency for swing axle suspensions to go into very severe positive camber in extreme corners), the bias ply tires used at the time were very insensitive to camber and did not significantly reduce cornering grip (unlike radial tires).Although Nader arguably overstated the severity of these handling problems, as was later claimed by U.S. National Highway Traffic Safety Administration (NHTSA) investigators. Part of Nader’s evidence against the Corvair was a promotional film created by Ford Motor Company, in which a Ford test driver purposely turned the Corvair in a way to make it appear unstable.

The 1964 rear suspension was modified considerably with a transverse leaf spring extending between the rear wheels to limit rear wheel camber change, and carrying much of the rear weight combined with softer coil springs.

In 1965, the Corvair got a state-of–the–art fully independent rear suspension closely resembling that of the contemporary Corvette. The redesigned suspension reduced the rear roll center down to half its previous height, using fully articulated half-axles that offered constant camber on the rear tires in all driving situations. The 1965 Corvair was referred to by Motor Trend as "the first American production automobile on the road with fully-independent rear suspension." (the Corvette was considered limited production). These changes however were viewed by some as an admission by Chevrolet of problems with the original design.

In what may be the automotive industry’s greatest irony the NHTSA, the federal agency created from Nader’s consumer advocacy issued a report clearing the 1960-1963 Corvair. The 1972 safety commission report conducted by Texas A&M University concluded that the 1960-1963 Corvair possessed no greater potential for loss of control than its contemporaries in extreme situations.¹⁹ Former GM executive John DeLorean, asserted in On a Clear Day You Can See General Motors (1979) that Nader's criticisms were valid.

Air-cooled engine

The Corvair engine, unique for an American car, presented a different set of requirements for mechanics. A common problem in the earlier years was oil leakage caused by dissimilar metal thermal expansion of the aluminum–and–steel engine. Chevrolet wrestled with several problems of this nature the entire time the Corvair was in production with varying degrees of success. The problems involved in sandwiching cast iron cylinders between an aluminum case and alloy heads were highly magnified by putting another cylinder on each bank. The cause of the oil leaks was the material used to manufacture the O-rings at the ends of the pushrod tubes. They were incapable of withstanding the Corvair's engine operating temperatures. After a year of driving, the O-rings became hard and crumbled allowing the leaks. When the tubes leaked, the oil would drip on the hot muffler piping from the heads creating that oil smell and resulted in bluish smoke coming out the rear vents. It was not until the 1970s that Viton made an O-ring which perfectly fit the tubes and could withstand temperatures up to 500F, and today Corvair owners utilize the Vitone o-rings and leaks are gone for several years. Chronic oil leakage from the pushrod tubes, caused by GM's choice of pushrod tube seal material, also contaminated the passenger heating air. That air might also become noxious if a 6-inch (152 mm) wide rubber seal almost 16 feet (5 m) long, located between the engine assembly and the body, was not maintained in like-new condition.

The problem of fumes and gases entering the passenger area via the heater system was endemic to air-cooled engines that used heat radiated from the engine directly to heat air for the passenger compartment. Carbon monoxide and other noxious gases could enter the passenger areas if exhaust system gaskets aged or failed. The gaskets were inside the heater box air intakes, and air for engine cooling was used for passenger–compartment heating when the heater was on (or leaking). The 1960 model Corvair used a GM Harrison division gasoline heater located in the front trunk area as its standard heater, similar to the Eberspächer heater offered as an auxiliary heater by Volkswagen as a dealer-installed option. This feature became optional in 1961 and was dropped in 1965 due to weak consumer demand. The Volkswagen Type I Beetle, another automobile with an air cooled engine, had a heater system which better isolated fresh air from engine cooling air fumes, and was only susceptible to carbon monoxide contamination from the two heat exchanger to muffler seals at the rear of the engine, as opposed to the eight exhaust joints in the Corvair system.

The interior air would also be contaminated if the voltage regulator allowed an over-voltage condition and the original battery vent hoses were not attached. The battery, which was mounted in the engine compartment, could emit hydrogen if overcharged. Chevrolet installed special battery caps and hoses that vented the battery to air outside the engine compartment, but these were often discarded by owners during the car's life. This air contamination problem is illustrated by the fact that many American cities' taxi regulations had prohibited air-cooled engine cars from being used as taxicabs when they derived their heated air from engine exhaust heat, decades before the Corvair and VW Beetle entered the market.

The Corvair engine's cooling fan was on top of the engine. The fan and generator were operated by a belt on the rear of the crankshaft. The criticism was the belt had to turn around two ninety degree pulleys, each twisting it sideways.

Steering column (1960-1965 models)

A criticism in Ralph Nader's 1965 book concerned the steering column design. Like most cars of its era, the Corvair's steering column was rigid and could impale the driver in a front-end collision. While the Corvair's steering box was mounted ahead of the front cross-member, it was well behind the frame horns, in what would later be called a "crumple zone," and could, in a severe front-end collision, push the steering column and steering wheel toward the driver. In practice, most driver chest injuries were sustained due to the lack of a shoulder belt, rather than steering column intrusion. Any increase in risk of injury due to steering column intrusion in a front-end collision was, however, more than offset by the absence of an incompressible engine and transmission in the front of the vehicle, which commonly intruded into passenger compartments on vehicles of the era. Chevrolet, aware of Nader's criticism, changed the steering shaft to a two-part design with a frangible joint late in the 1965 model year, and a collapsible steering column was provided in 1967, towards the end of the model's life span.

Production notes

Concept cars

The Corvair spawned a number of innovative concept vehicles including the Corvair SS, Monza GT, Monza SS, Astro III, and even two Corrozzeria Pininfarina "Corvair Speciale" show cars.

The Chevrolet Corvair Monza GT coupe toured together with the Monza SS (Spyder) in early 1963, making a further public appearance at the New York Auto Show. Although both cars were based on the Corvair drive train, each represented a futuristic development of the adaptable Corvair design. In the SS convertible, the engine (with a four-carburettor setup) was left in its stock location behind the transaxle, allowing a shorter (88 in (2,235 mm)) wheelbase. Although the SS came very close to production, both cars remained concepts only. The Monza GT is housed at the GM's Heritage Center in Detroit.

Racing & Modified Corvairs

Many sports car purists were more interested in the Corvair (particularly the 1965 and later cars) than in more conventional designs, such as the Ford Mustang, despite the latter's power advantage.

Yenko Stinger

Don Yenko, who had been racing Corvettes, could not compete successfully against the Carroll Shelby Mustangs after they arrived on the scene; he therefore decided to race modified Corvairs, beginning with the 1966 model. As the stock Corvair did not fit into any of the SCCA categories, Yenko had to modify four-carburetor Corsas into "sports cars" by removing the back seat; in the process he would introduce various performance improvements. As the SCCA required 100 cars to be manufactured to homologate the model for production racing, Yenko completed 100 Stingers in one month in 1965. Although all were white, as the SCCA required for American cars at the time, there was a great deal of variety between individual cars; some had exterior modifications including fiberglass engine covers with spoilers, some did not; some received engine upgrades developing 160, 190, 220, or 240 hp (119, 142, 164, or 179 kW). All were equipped by the Chevrolet factory with heavy duty suspension, four speed transmission, quicker steering ratio, positraction differentials (50 with 3.89 gears, and 50 with 3.55 when Chevrolet dropped the 3.89) and dual brake master cylinders (the first application of this by Chevrolet, to become stock equipment the next year). The Stingers competed in Class D Production, which was dominated by the Triumph TR4, which was very quick in racing trim; however in its first race in January 1966, the Stinger was able to come in second by only one second. By the end of the 1966 season, Jerry Thompson had won the Central Division Championship and placed fifth in the 1966 Nationals, Dick Thompson, a highly successful Corvette race driver, had won the Northeast Division Championship, and Jim Spencer had won the Central Division Championship, with Dino Milani taking second place.

The next year, however, Chevrolet dropped the Corsa line, and the Monza line was not initially available stock with the four carburetor engine; the engine was eventually offered as a special performance option, however, along with the 3.89 differential. The Monza instrumentation, however, did not have a tachometer or head temperature gauges, which had to be separately installed. The SCCA, on the other hand, had relaxed its ruling regarding color, and the cars were available in red or blue. It is believed that only fourteen 1967 Stingers were built, but Dana Chevrolet, who distributed Stingers on the U.S. West Coast, ordered an additional three similar cars to be built to Stinger specifications, but with the AIR injection system to meet California emissions laws, with Yenko's permission. A total of 185 Stingers are believed to have been built, the last being YS-9700 built for Goodyear Tire and Rubber Company as a tire test vehicle in 1969 – 1970. Comedian, television star, and car enthusiast Tim Allen currently owns and races Yenko Stinger #YS-043.

Fitch Sprint

Longtime roadracer John Fitch was particularly interested in the Corvair as the basis for a spirited road and track oriented car, due to its handling. The basic Sprint received only minor modifications to the engine, bringing it to 155 hp (116 kW), but upgrades to the shock absorbers and springs, adjustments to the wheel alignment, quicker steering ratio, alloy wheels, metallic brake linings, the obligatory wood-rimmed steering wheel (leather available for an additional $9.95) and other such minor alterations made it extremely competitive with European sports cars costing much more. Body options such as spoilers were available, but the most visually remarkable option was the "Ventop", a fiberglass overlay for the C-pillars and rear of the roof that gave the car a "flying buttress" profile.

Fitch went on to design and build a prototype of the Fitch Phoenix, a Corvair-based two-seat sports car, superficially resembling a smaller version of the Mako Shark based Corvette. With a total weight of 1,950 pounds (885 kg), even with a steel body, and with the Corvair engine modified with Weber carburetors to deliver 175 hp (130 kW), the car delivered spirited performance for $8,760. Unfortunately, the Traffic Safety Act of 1966 placed restrictions on the ability to produce automobiles on a small scale; this was followed by Chevrolet's decision to terminate production of the Corvair, which confirmed the end of Fitch's plan. He still retains the prototype however, and occasionally exhibits it at car shows. The car may be glimpsed briefly in the documentary film Gullwing at Twilight: The Bonneville Ride of John Fitch.²⁰

From the first appearance of the Corvair, a large selection of high-performance equipment and modifications became available for it.

V8 Corvairs

The ultimate Corvair modification was replacement of the engine with a V8. As daunting as this might seem, two things made it possible:

A radiator occupies the former trunk, in the front of the vehicle. However, the former engine compartment in the rear now is available as luggage space. A complete kit to adapt a Chevrolet small-block V8 to a Corvair was manufactured by a company named Crown Manufacturing, for $600. The resulting vehicle weighed only 2,750 pounds (1250 kg), compared to 3,700 pounds (1680 kg) for a small block Corvette, and possessed independent rear suspension of almost the same design. Crown's prototype with 350 hp (261 kW) Corvette engine recorded an elapsed time of 12.22 seconds and 105 miles per hour (169 km/h) in the quarter mile (402 m). An advantage of this modification is that the mid-engine design provides optimal handling characteristics for the road, as well as excellent drag strip traction without the need for slick or "cheater slick" tires as seen in front engine cars, let alone modifying the wheelbase as on the FX funny cars of the time. Although a few Corvairs have been modified to accept the Chevrolet big-block engine, the added size of the engine makes the work significantly more difficult, and the result, although a great performer, tends to be unreliable. Yenko Corvair YS99 was one of the 300 or so CORV8 conversions made. It is also possible to install a reverse rotation small block chevy in place of the flat six with many modifications.

Eshelman Golden Eagle

The first Eshelman Golden Eagle was an ordinary mid-1960s Chevrolet Corvair retrimmed with special emblems and other ornamentation and marketed through used-car dealers by Eshelman Motors Corporation of Baltimore, Maryland.

By 1967 the model was called the Eshelman Golden Eagle Safety Car and was based on the contemporary Chevrolet line, but now each Golden Eagle had a patented standard 15 mph (24 km/h) impact-resistant "crash absorber" fashioned by incorporating each car's spare tire into the front bumper. Advertising claimed the cars were "Designed for the owner who has a special value for his life and the lives of his loved ones." Known Golden Eagle dealerships included the former Kislack Kar Sales in Houtzdale, Pennsylania and Plaza Motors in Niagara Falls, New York, but exact sales numbers are not known.

Dune Buggies & Aircraft

Corvair flat-six engines were a popular alternative to Volkswagen engines in dune buggy applications, and off-road racing. Some corvair engines have also been used to power light aircraft.

Gallery

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