Re: rev-limiter; what's the big deal?

From: Sam Parthemer (samp@cts.com)
Date: Fri Oct 17 1997 - 15:45:02 EDT


*snip*
> As to what the benefit is -- gas pumps such as the internal combustion
> engine produce more specific output as more gas flows through them. Given
> that only a certain percentage of the gas gets through the combustion
> chamber in each cycle, the way to move more gas is to spin the motor
faster
> and faster so you get more cycles. Of course, there are still limits.
>
> This is why, under rules that restrict displacement, every form of auto
> racing involves engines spinning at incredible speeds (getting close to
> 20,000 rpm in F1).
>
> Hope this helps,
>
> Jim

        But with the stock cam, even better breathing won't bring the HP peak
above 5000 rpm (a supercharger/nitrous probably would-- but you can't run
the
MP SBEC with either (without serious detonation problems)). A different
duration/lift
cam would move the peak hp rpm higher, and a free reving computer would
work
then.

        My peak of 212 hp (to the ground) is at 4400...and anything about 4500
the hp drops like a rock... Peak torque comes in at 3800 rpm...and goes
away
above 4500 rpm like the hp.

        Sam



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