Matt W 4 Posted September 30, 2005 Report Share Posted September 30, 2005 if its totaly smooth it restricts airflow!!How does being smooth in the exhaust manifold restrict flow. I thought it was only in the head that if it was totally smooth then airflow would be restricted? As it needs to have some 'roughness' to improve swirl and the like.But i'm still learning so maybe i'm a little confused! !lol Link to post Share on other sites
Ciaran 4 Posted September 30, 2005 Report Share Posted September 30, 2005 no way rough edges are needed cos less restriction means better flow rough edges cause turbulance much like the way a car is more streamlined than a doulble decker bus! Link to post Share on other sites
Nerih 0 Posted September 30, 2005 Report Share Posted September 30, 2005 i dont see how a smooth exhaust tract restricts airflow...it does mean less turbulance and backpressure, no? Link to post Share on other sites
Ultimatetune 0 Posted September 30, 2005 Report Share Posted September 30, 2005 you want rough on the inlet side to a degree to aggitate to the air fuel mix for better combustion and smooth on the outlet (exhaust) as it allows the gases to exit faster. Link to post Share on other sites
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