Re: Streight pipes on WORK tractors

Posted by buickanddeere on July 29, 2007 at 21:40:46 from (209.240.124.12):

In Reply to: Streight pipes on WORK tractors posted by Dairy farmer in WI on July 29, 2007 at 19:25:46:

Listen to Bob.
Cold atmospheric air at 14.7psi falling down or being drawn into the pipe, manifold, exhaust port then past the exhaust valve? As the residual combustion chamber pressure of 100-300psi is pushing exhaust out ahead of the rising piston? Ummmmmmm no.
Engine requiring exhaust back pressure to operate..............no.
A carburetor is calibrated for the proper air/fuel mixture with the factory aircleaner & exhaust system.
The carb sometimes will not meter enough extra fuel to compensate for the extra airflow unless jetted richer. That is where the leaner/hotter mixture and exhaust overheats valves and warps/burns them.
If worried about thermal shock to combustion chamber components such as intake/exhaust valves, spark plugs, injectors, piston tops, rings, head gaskets, cylinder walls and cylinder head?
Then you should be worried about your engine in the winter drawing 0F to -40F air through the intake system into the combustion chamber.
Old wives tales here again.
And yes you will be saying huh, what, pardon and speak up more in the future.
The HP gains will be minimal and everybody around will be thinking. Who is the *sshole wantabe racer/puller with the yappy straight pipe?
Oh, straight is spelled as "straight".

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