Re: Will straight pipe hurt motors??

Posted by Mark - IN. on October 14, 2005 at 20:04:51 from (152.163.101.7):

In Reply to: Re: Will straight pipe hurt motors?? posted by Jerry/MT on October 14, 2005 at 14:07:12:

You're correct on richening to a point. Richer typically will run cooler, however too much richening will burn unburnt gasses into the exhaust runners, hence the gold or bluing of the pipe. That can be bad too, if over done. When running an air cooled, instead of idling non-stop, is better to pop the throttle occasionally because that instant short reflux of cool gas into the cylinder actually provides a momentary cooling. When I pop the hog at an intersection on a hot day, not trying to show off or drive the folks ears nuts, just trying to keep a 97" shovel from seizing and having to put another $5K into the motor. Been there, done that. Besides, S&S backs me on that one.

I hear guys talking about the racers do this, and the racers do that, but those are very expensive throw away engines from an aspect of at least tearing them down and rebuilding per run (drags) or race (oval). Not too many folks gonna do that to the old A, Jubilee, etc. I think some are confusing what they think optimum is, with reliability.

Mark

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