fot
[Top] [All Lists]

Re: [Fot] Fwd: Tr3 Cylinder pressures

To: "Randall" <tr3driver@ca.rr.com>
Subject: Re: [Fot] Fwd: Tr3 Cylinder pressures
From: Bill Babcock <billb@bnj.com>
Date: Tue, 2 Nov 2010 17:07:20 -0700
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 
> _______________________________________________
> fot@autox.team.net
> 
> http://www.fot-racing.com
> 
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe: http://autox.team.net/mailman/options/fot/billb@bnj.com
_______________________________________________
fot@autox.team.net

http://www.fot-racing.com

Donate: http://www.team.net/donate.html
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums


<Prev in Thread] Current Thread [Next in Thread>