All Corvairs are Horizontally opposed, air cooled, six cylinder, direct drive engines.They can be run on either 100LL fuel, or automotive fuel, with ethanol content up to 20%.
All engines have equal reliability, the increase in power is always from a displacement increase, the engine is doing the same work per cubic inch.
All engines 2,700-2850 are based on using the Forged GM crankshaft.
Engines 2,700-2,850 use remanufactured forged GM connecting rods.
All HP ratings are at 3,100rpm. All engines can be run at 3,400 rpm continuous.
2,700cc 100HP
Standard Corvair Conversion engine, Most popular engine in previous years. Based on Sealed Power Pistons. Weighs 235 pounds, slightly lighter than an O-200 Continental or a Viking 130. If run on auto fuel, the engine requires a slight timing reduction and is rated at 95HP. Most economical engine to build.
2,850cc 112HP.
Displacement increase by .105” overbore. Maximum displacement increase with “bolt on” parts, (Larger displacements require machine work to the cases and heads) Built with Ross Pistons, which allow full power on automotive fuel. Weighs 228 pounds, weight reduction due to overbore on original GM cylinders. Strong power increase with modest cost increase.
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