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Author Topic: INTAKE/EXHAUST RUNNER LENGTH  (Read 333 times)

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Offline CATDIESEL

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INTAKE/EXHAUST RUNNER LENGTH
« on: March 17, 2013, 09:07:29 pm »
has anyone here ever tried making intake/exhaust runners longer or shorter for more performance? i guess the exhaust would affect the performance the most? i have thought about decking the exhaust flange on the jug. also making some custom spacers to move the muffler away from the jug in 1/4" increments. any thoughts on this?
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Offline aclarke

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Re: INTAKE/EXHAUST RUNNER LENGTH
« Reply #1 on: March 18, 2013, 04:43:16 pm »
In general, longer intake will bias the tuning towards lower rpm.   Calculating the resonance frequency is beyond my ability but there may be some programs available to do this on two strokes....
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Offline Al Smith

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Re: INTAKE/EXHAUST RUNNER LENGTH
« Reply #2 on: March 19, 2013, 04:14:39 am »
Resonant frequency on both the intake and exhaust is the ellusive pot of gold nobody has managed to acheive over any width of rpm range except a very narrow band .
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