Re: Streight pipes on WORK tractors

Posted by Bob on July 29, 2007 at 20:39:17 from (69.178.229.154):

In Reply to: Re: Streight pipes on WORK tractors posted by georgeky on July 29, 2007 at 20:20:44:

There's a theory that says HOT valves will sometimes cool very rapidly upon shutdown, with a straight pipe, and then burn next time the machine is "worked", because they are warped and not sealing properly.

Another possible reason is that the engine is "breathing better" with the straight pipe, and running leaner, and a LEAN mixture can burn hotter, and burn valves.

However, in my experience, the "straight pipes burn valves story" is more of an old mechanics' wive's tale than anything else.

Sure isn't good for the ears, though!

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