For the 0-200 what IS the limiting factor for rpm? With most road engines it's valve float.
Thoughts? On Mon, May 6, 2013 at 1:14 PM, <brian.kraut at eamanufacturing.com> wrote: > One thing about the O-200 is planes like the KR is that you really need to > run them up around 3,200 RPM or more to get the most out of them. The > O-200 in my M1 was way more powerful when I lowered the diameter of the > prop and got it up a few hundred RPM. Some people think it is not good to > run them past their redline, but the redline from a 150 is with a big heavy > metal prop. They are quite happy running faster with a light wood prop. > > -------- Original Message -------- > Subject: Re: KR> Interesting info, Corvair torque > From: "Mark Langford" <ml at n56ml.com> > Date: Sun, May 05, 2013 4:49 am > To: "KRnet" <krnet at list.krnet.org> > > 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 > -------------------------------------------------------- > > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options > > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options > >
