Re: Straight Pipe

Posted by Janicholson on January 29, 2006 at 14:26:35 from (66.173.50.131):

In Reply to: Re: Straight Pipe posted by Greg_KY on January 29, 2006 at 13:28:58:

In addition to what Greg has said, I would add that the introduction of cold air into the exhaust valve ports when the engine is shut off, and the extremely hot valves get unevenly cooled in the stem and head, can warp them.

Headers on an engine (assuming they are designed using computational fluid dynamics and are real competition components) use exhaust scavenging to time the pressure and partial vacuum acoustics of the pipe/s so that at particular engine RPM the partial vacuum is pulling the last exhaust out of the cylinder (during overlap) and creating an easier entry of charge. Unless the engine/cam is pretty far toward the racing end of the spectrum, there will be mild effects of this pulse related advantage. Big huge large diameter pipes and headers are only used on machines that can produce enough flow to create high velocity in the big pipes. Low speed engines with modest cylinder displacement, shrouded valve placement, and small valve area will be little affected.
JimN

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