Alfa Romeo Forum - View Single Post - Exhaust systems

mave · 22-05-2008

Interesting link, as I've always understood, you don't want back pressure, you actually want flow velocity. Just so happens that smaller exhaust pipes which tend to have higher flow velocities also tend to have higher back pressure. Or to look at it another way; if you put a 1" pipe downstream of your exhaust manifold, you'd get a lot more power than if you put a plate over the end with a 1" hole in it...

22-05-2008	#17 (Post Link)
mave AO Silver Member Join Date: Sep 2003 Location: Bristol Posts: 2,605	Re: Exhaust systems - What you need to Know Interesting link, as I've always understood, you don't want back pressure, you actually want flow velocity. Just so happens that smaller exhaust pipes which tend to have higher flow velocities also tend to have higher back pressure. Or to look at it another way; if you put a 1" pipe downstream of your exhaust manifold, you'd get a lot more power than if you put a plate over the end with a 1" hole in it...