And my point exactly.
On Nov 2, 2010, at 4:11 PM, Randall wrote:
>> Oops again. Yeah, I used 6500 instead of 13000.
>
> Anyway, my point was not to argue about the numbers, only that BMEP varies
> with rpm and drops off significantly at higher rpms, due to restriction in
> the intake and exhaust. Your 7 to 8.5 bar (roughly 100 to 120 psi) is
> probably reasonable at the revs these engines see on the race track, since
> folks are presumably pushing the upper limits of breathing.
>
> None of which, unfortunately, gets Alexandre what he wants, which is
> presumably BMEP across the rev range he is planning to run at, for the
> purposes of guessing at optimum timing. With head porting and camshaft
> design being the black arts they are, I suspect the only good way to answer
> the question is to run the motor on a dyno and measure it. Of course,
> getting best power implies finding the best timing first, so might as well
> keep that rather than going through the BMEP calculation.
>
> Anyway, that's my theory <G>
>
> -- Randall
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