Ne1 pt to exhaust header & crossover design eqns or sw?

[its325]

Looking for exhaust header and system design equations or software.

Thanks,
Mike

 

[evelrod]

Try your browser---that stuff is everywhere. Every header mfgr in the world has a web site.
Try Carrol Smiths books for a laymans point of view on ex design. Amazon.com or whatever. Peterson Publishing/Hot Rod etc.
Pull up Racers Wholesale or Summit Racing and browse their catalogs for programs. You do the 'legwork', ok?


Rod

 

[werdnaid]

from A Graham Bell's Four Stroke Performance Tuning

Primary length

P = ((850*ED)/rpm) - 3

rpm = speed tuned
ED 180 degrees + number of degrees exhaust opens before BDC

Primary Dia

ID = SQR(cc/((P=3)*25)) * 2.1

On a 90 degree motor firing such as V8, balance pipe Dia is 1.5 * P



Hope this helps.

drew

 

[MattWanless]

Hi Gents,

I've been looking at exhaust manifold design, specifically for V6 engines.

All the formula stuff seems to be generic for engines with pulses separated by 180 degrees of the crankshaft. which is cool for 4 cylinders and v8's, but not for V6's.

Is it right to assume that the primary lengths generated by formula for the 180 engines need to be 33% longer for the V6, assuming constant gas speed. This is because the exhaust pulses are 33% closer together (120 degrees of the crank turning as opposed 180). Should I use the same formula's for the 180 degree inside diameter?

Many thanks in advance