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Another website with formulas, good stuff, mostly fiat based. They have some other good information too, but this most directly relates.
http://www.scuderiatopolino.com/Exhaust.htm

Length of primaries.

L=(1700)120/N N being desired RPM and L being length in inches...same as the other one I guess.

Diameter of primaries

V=(Piston Speed in feet per second)x(D2/d2)

V is velocity of gas, they say roughly 300fps is ideal.
D2 is the bore squared
d2 is the diameter of the primary squared.

Bring on the algebra!

I love the smell of 2-stroke exhaust in the morning...no seriously, I can't get enough of it.
 

· Registered
Joined
·
2 Posts
Another website with formulas, good stuff, mostly fiat based. They have some other good information too, but this most directly relates.
http://www.scuderiatopolino.com/Exhaust.htm

Length of primaries.

L=(1700)120/N N being desired RPM and L being length in inches...same as the other one I guess.

Diameter of primaries

V=(Piston Speed in feet per second)x(D2/d2)

V is velocity of gas, they say roughly 300fps is ideal.
D2 is the bore squared
d2 is the diameter of the primary squared.

Bring on the algebra!

I love the smell of 2-stroke exhaust in the morning...no seriously, I can't get enough of it.
 
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