header length

beentryin

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May 17, 2010
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anyone know what sbp ex chamber header length gives what powerband for low-end vrs top-end
 
really? hey my bad didnt know i commited a felony wont happen again.believe it.wow!!!!!!! umm isnt this the REPAIR AND MODIFACATION thread? like moding a ex chamber?
 
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i was just wondering what short header length vrs long .is long better for torque or top end.
 
For one thing, there is only a certain range of lengths where the tuning actually works. You have to be in a range that "gets on the pipe", IOW you have to be at a length where the expansion chamber is actually working for you. You rev and you feel power COME ON - then you can shorten the pipe to raise the RPM of the power band a bit.

The length of the pipe in the stock configuration is longer than it needs to be in most cases. If you
would like to increase the power in the upper rpm range you will need to shorten your header length.
This is done by removing and shortening the section of straight pipe between the exhaust header and
the 45 degree fitting. Remove ¼ inch sections at a time and retest. Continue shortening this header
until you get what you are looking for.
A word of caution, these engines only produce so much power. You cannot expect to just keep
shortening the header length and it will continue to rev higher. There is a point where the port timing
of the engine just will not allow it to rev any higher and on these motors is probably a good thing or
we would blow them up.
 
For one thing, there is only a certain range of lengths where the tuning actually works. You have to be in a range that "gets on the pipe", IOW you have to be at a length where the expansion chamber is actually working for you. You rev and you feel power COME ON - then you can shorten the pipe to raise the RPM of the power band a bit.
its has good mid to top end but bogs below 10 15 mph i want more low end torque
 
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