"Tuning the A-Series Engine", 3rd edition by David
Visard has about 30 pages on exhaust systems. He
speaks specificaly about 4-2-1 and recommends a
computer program "Dynomation" JK
--- Greg Wilkinson <gregwilkinson@adelphia.net> wrote:
> Hi Michael,
> You might want to check this site out.
> http://www.burnsstainless.com/Xdesign/xdesign.html I
> bought a bunch of
> stainless J bends from them to make my un-scientific
> exhaust. Xdesign is a
> computer exhaust modeling program that I read about
> at the above address. It
> talks about 4 to 2 to 1 systems. Their oval tubing
> looks pretty cool
> especially for our low cars.
>
> Happy New Year,
> Greg
>
> -----Original Message-----
>
> I need to design and build an exhaust header for
> AHX12 (100S engine) to use
> in the upcoming Aussie / US Challenge series.
> I have been able to find a formula for a 4 into 1
> system but cannot find a
> formula for a 4 into 2 into 1 system which reputedly
> produces a wider power
> band.
> Can anyone out there help with this?
>
> Michael Salter
> www.precisionsportscar.com
>
>
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