exhaust

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May 1, 2009 | 11:37 AM

sam

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Joined: Apr 2009

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From: cleveland

exhaust

if i cut 3 to 4 inches off my exhaust will it hurt my motor?

May 1, 2009 | 05:31 PM

73Q

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Joined: Apr 2009

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From: Queensland, Australia

G'day. It may reduce the performance of your engine. The manufacturers design them at a certain length to harmonise the exhaust gas pulses with the cam timing. So shortening it may reduce you performance unless you tune around it. I'm not a mechanic, but I don't think it will damage your engine unless it creates a too lean fuel air mixture. If you make the mod, I'd certainly suggest you have it dyno tuned correctly.

May 1, 2009 | 06:45 PM

CBRclassic

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Q pretty much summed it up ..
Just ripping in and taking pieces out of exhausts can put an engine out of tune...
As a rule mod an exhaust , re tune...,
You can make a simple test by just checking plug color before and after....
It is an easy way to see if it has made much difference..

May 2, 2009 | 12:39 AM

Hangfire

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All the above is correct, however to clarify, are you asking about cutting 3-4 inches off of your actual exhaust pipe, or trying to make a custom shorty exhaust by taking 3-4 inches off of your muffler? And what do you ride?