Re: Uncorked exhaust

[jlandry@domain.elided (John A. Landry)]

LATE BREAKING NEWS: Tom Mandera <tsm1@domain.elided> wins the 40 million dollar
lottery and says:

>I've been told NOT to run a motor w/o an exhaust for long, or you'll
>burn the valves?  Something about the too-cool ambient air rushing up
>the manifolds and into the heads when you shut the the motor doww, and
>causing "bad things."
>
>True?  Not true?

Tom,

This is one of those "wives tales" that probably evolved out of the fact
that an engine run with little or no exhaust back pressure will exhibit a
shift in the power curve.  The changes depend on the engine and its design,
but sometimes the changes are negative (less torque for example).  But
running a stock engine without an exhaust isn't going to hurt anything
except your ears... and maybe the hot exhaust might fry a few things in
close proximity to the engine if exposed long enough.

John L.
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