Sport Performance Aviation LLC (SPA) unveiled their long anticipated Corvair 3.3L Stroker engine at EAA AirVenture. The engine uses a stroked version of SPA’s custom USA-made billet crankshaft installed in a machine-clearanced case, and also includes SPA’s second-generation 5th bearing, reconditioned cylinder heads, and rear alternator combined with FlyCorvair’s conversion parts.
The 3.0L Corvair configuration, developed by Dan Weseman of SPA, is 3000cc (190 cubic inches). This configuration is a popular powerplant for aircraft such as the Sonex, Zenith, and most recently SPA’s Panther. The stroker engine is 3300cc (200 cubic inches). The thrust of this configuration is similar to the output of the 3.0L, but with a lower rpm to make more efficient use of propellers.
After AirVenture, Stroker engine testing will continue on a test stand and then move to a third-party dynamometer for output verification. SPA expects to then re-engine their prototype Panther N515XP with the new engine for flight testing. Based on testing, orders will be accepted in fall of 2015.