Something to remember is that Continental also made a GO-300 that uses the same rods and bearings, and a slightly different piston. ?Same compression, not really any beefier, but turns 3100 or 3200 RPMs. ?They are also a 1200 hour TBO, just for comparisons sake, and often times don't make that. ?As Edd says, the loads go up dramatically with RPMs, so running them hard and fast is a great way to make a really reliable engine into a not so reliable engine. ?And the failure mode of a rod or valve failure is not a pleasant thing to experience in flight. ?Horse power isn't going to get you much in the way of speed. ?Aerodynamics will get you speed. ?HP is good for climb performance. ?I prefer to work at aerodynamic clean up to make the plane go fast and rarely push my engine beyond the recommended rpm range. Your mileage may vary. ?
-Jeff Scott Los Alamos, NM > ----- Original Message ----- > From: edd_wood at talk21.com > Sent: 05/06/13 04:48 PM > To: KRnet > Subject: Re: KR> 0=200 rpm limit > > The greatest load on an engine is at TDC on the exhaust stroke, believe it or > not, and the load is tensile. The 0200 is a relatively large capacity engine > with just four cylinders which means the pistons are large and heavy which > means large tensile loads. The load is squared with the increase in revs > which means that increased revs puts a massive load on the con rods which in > turn leads to engine failure. The beauty of most aircraft piston engines is > the low output, low stress characteristics which is why they are so reliable. > If you want to tune an engine for high horsepower/revs in relation to it's > capacity then an aircraft engine is not the way to go. > ? > > --- On Mon, 6/5/13, Larry&Sallie Flesner <flesner at frontier.com> wrote: > > > From: Larry&Sallie Flesner <flesner at frontier.com> > > Subject: KR> 0=200 rpm limit > > To: "KRnet" <krnet at list.krnet.org> > > Date: Monday, 6 May, 2013, 23:14 > > At 01:49 PM 5/6/2013, you wrote: > > >For the 0-200 what IS the limiting factor for rpm?? > > With most road engines > > >it's valve float. > > >Thoughts? > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > > I've always heard it was valve float.? Crank them up > > till you can't > > get any more rpm and they race them all season like > > that.? If you > > have a need for that much more speed, simply set an earlier > > departure time. :-) > > > > Larry Flesner > > > > > > > > _______________________________________________ > > 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
