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.
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.
