Joe Wallace wrote: > I found an article that may be interesting and maybe old stuff for all... > jw > http://www.flycorvair.com/thrust.html
The interesting thing about this page and the other associated links on William's website is that torque/hp numbers aren't given for the Corvair, at least not that I've been able to find. Don't get me wrong, I'm a big fan of the Corvair engine, but you'd have thought WW would have published actual test results for at least one Corvair engine from that same dyno stand. On one of his pages he writes "It has taken years of development to get the 164 cid Corvair motor to economically produce 100hp with the reliability that is required from flight engines. While we now have a 120hp 190cid motor, it makes its power at an elevated rpm, 3,200rpm, and it cannot be considered a direct replacement for the O-235 in this application." The "desktop" dyno simulations that I did years ago indicate that you could get 100 HP @3200 rpm out of a Corvair when modified with the OT-10 cam. See http://www.n56ml.com/corvair/specs.html for lots more details on CorvAircraft engine performance with various cams and displacements, as well as factory torque/HP tests. But back to the aforementioned O-200 test showing only 85 HP, When I had the 2700cc (stock displacement) Corvair engine in N56ML, Larry Flesner's plane and mine were almost a dead match for each other, until I got wheel pants on my plane. And that was probably with 2000 hours SMOH on his engine, and 200 hours on mine! So don't think the O-200 is a slouch of an engine. Maybe it's the larger diameter prop that gets it there, but they hold their own, and very reliably, as Larry's engine attests. Troy Petteway has one of the fastest KRs out there, and it runs an O-200, although it's the high compression version. There's certainly nothing wrong with the O-200 in a KR, other than the fact that longer gear legs are needed for proper prop clearance, but longer gear legs aren't a bad thing either... Mark Langford ML at N56ML.com website at http://www.N56ML.com --------------------------------------------------------
