Re: silly question about muffler versus straight s

Posted by B-maniac on February 22, 2007 at 14:32:01 from (207.241.134.34):

In Reply to: Re: silly question about muffler versus straight s posted by Hendrik on February 21, 2007 at 23:46:10:

You are right about the 2 stroke thing but only to a point. That point being that the only back pressure that is of any bennefit is PROPERLY TIMED back pressure. This is why a 2 stroke uses a tuned expansion chamber instead of a muffler to achieve max hp and torque. Exhaust pulses bounce back and forth to provide scavenging when needed and back pressure when needed. Diesel..no need. Gas engines(4 stroke) don't need back pressure , BUT they do need the fuel mixture richened up to make up for no back pressure or they will run lean and we all know what that does to an angine.Run hot,burn pistons,and valves and less power. Tuned headers actually "draw" the exhaust out in a timed manner which is even better than 0 back pressure BUT only if you add fuel at the other end.

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