Re: Chrome Stack

Posted by buickanddeere on June 05, 2005 at 11:55:48 from (216.183.135.44):

In Reply to: Re: Chrome Stack posted by txgrn on June 05, 2005 at 07:29:19:

Natural aspirated engines run best with about 300fps exhaust velocity if memory serves.
Smaller begins to create significant back pressure.
Too large and those exhaust gases don't have enough velocity to induce low pressure scavenging after the exhaust valve close. The gases flowing down the pipe leave a low pressure area behind. This lowers the delta P a little between the manifold and combustion chamber assisting more exhaust out and more fresh air in. .
The length of the pipe and any turns are important as well.
The differences will be much less pronounced on a 404 diesel vs. a tuned two stroke snowmobile engine.

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