> > Why is it that the motor blows when you go over 10,000 Rpm. In the first
> > place that a little high for the red line. In the real world after you
> > hit the red line or max. power that the engine will develops you would
> > float the valves and the power would drop off.
> Valve float is not necessarily experienced right after
> red-line. Red-line could be set by other mechanical limits in the
> motor. In any event, the power does drop off in the Papy motors above
> 8400 I believe.
> Power drop-off is almost never caused by valve float (since motors
> with floating valves don't last very long, even on a dyno), but by
> volumetric efficiency, head flow, camshaft design, and fuel delivery
> concerns.
> > Now I tried what the book says to be at 8,000 RPM at the end of the
> > Straight-aways. Now I think that a bunch of bull. People will blow
> > right on by you. If anyone racing on line is using this as a red
> > line and getting good results set me straight.
> I don't know what book you're reading, but I think 9000 at the end of
> the straights is a better shot for sprint races and 8700 or 8800 for
> long races.
> ---Jim
While you're on the thread, Jim..
I used to race Sears P a lot, and after a while, I started a habit of
changing quite early (say 8-8500), and found my laptimes improved, but,
it also seemed like the car spun its rear *** more. How is torque
"tuned" in the Papy engine? I ceirtainly use a lot less fuel when
running low RPMs..
Best,
Matt
--
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Matthew Birger Patrick Knutsen
(http://www.racesimcentral.net/~matthebk)
"Racing cars is like dancing with a chainsaw"
-Cale Yarborough
Cheek Racing Cars (http://www.racesimcentral.net/~kareknut/)
Please Remove "NoSpam" from my E-mail adress when replying!
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