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Hot pipe=best performance?

Glitch

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Dec 3, 2001
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#1
I'm starting to get into snowmobiling also now and heard some people talking about a button on race snowmoibiles that I think revs the engine just high enough that the clutch doesnt engage. This apparently heats up the pipes so they are hot for the start of the race, and this gives them a boost. So I asked around alittle in one snowmobile forum buy no one really gave a real answer as to why a hot pipe gives you best performance. I never thought that the pipes temperature had much to do with performance, just its shape. So does anyone know why a hot pipe gives better performance than a cold one. :think:
Thanks
Jim
 

Studboy

Thinks he can ride
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Dec 2, 2001
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#2
What temperature the pipe was designed to run at does play some effect in how warm you want the pipe to be at.  This is part of the reason why an engine jetted too rich often runs poorly, the exhaust temperature is never high enough to heat the pipe up to its "running range.".

If the pipe is cold, it is effectively longer.

If the pipe is warm, it is effectively shorter.