Classic Car Archive Specs, Facts, & History
The Chevrolet Corvette (C4) was a sports car produced by the Chevrolet division of General Motors for the 1984 through 1996 model years.
The editors of Consumer Guide stated: "The first fully redesigned Corvette in 15 years was more sophisticated and more practical than the beloved Shark.”
1992 was a very good year for the Corvette. The horsepower ratings for the Corvette all changed drastically with the introduction of the LT1 motor in the 1992 Corvette.
The Corvette LT1 engine The LT1 was named after the highly regarded solid lifter small block LT-1 motor first used in the 1970 Corvette. The horsepower increased by 20% to 300 hp. This was accomplished by using computer controlled ignition timing, a low restriction exhaust system, a more aggressive camshaft profile and free-flow cylinder heads. Max. RPM was 5700, a whopping 700 RPM more than its L98 predecessor.
Probably the most interesting change in the LT1 was the revised cooling system strategy. Most engines route the coolant from the water pump to the block and through the head(s). In the LT1, coolant took the opposite path, starting in the cylinder heads and then cooling the engine block. Cooling off the heads first enabled the LT1 to reach new horsepower levels.
The Corvette ASR (Acceleration Slip Regulation) created by Bosch was introduced. Standard equipment on all Corvettes, it worked by retarding the engine spark, closing the throttle and brake intervention. The throttle cable relax feature was interesting. It communicated to the driver that the system was “taking over” by giving him/her a gentle push back on the gas pedal. It was designed with the performance oriented driver in mind and could be switched off.
On July 2, 1992, the one millionth Corvette was built! The color choice for the one millionth Corvette, white with red interior and black roof was appropriate. This was a nod to the 1953 Corvette, whose entire production run of 300 units featured the same livery. It is fitted with an automatic transmission, as was all of the 1953 Corvettes.
As could be expected, the motoring press greeted the new standard engine with applause. Perhaps what Chevrolet did not expect was that most reviewers would also conclude that the LT1 and its 300 hp tended to make the ZR-1 with its 75 extra horsepower, not to mention its steep sticker price, somewhat irrelevant. Car and Driver, for example, found that while the ZR-1 could hit 60 mph from a standing start in 4.7 seconds, the LT1 could reach it in just 5.1 seconds. While the magazine’s top speed of 179 mph for the King of the Hill still reigned supreme, few rational motorists could argue that the 161 mph top-end the LT1 reached wasn’t enough. On paper and in buyers’ minds, the extra $31,683 tariff for the ZR-1’s dwindling performance premium hardly seemed worth it, and only a scant 502 buyers ordered RPO ZR1.
|Engine||0 to 60 MPH||Quarter Mile||Source|
|350 cu in 300hp LT-1||5.1||13.8 @ 105 mph||Simulation|
|350 cu in 375hp ZR-1||4.7||13.3 @ 108mph||Simulation|
|350 cu in LT-1||350 cu in||Injection||300 hp @ 5000rpm||330 lb-ft@ 4000rpm|
|350 cu in ZR-1||350 cu in||Injection||375hp @ 4800rpm||370lb-ft @ 4800rpm|
Ask Corvette expert Richard Ehrenberg