d1mbu1b
10-04-2006, 09:39 AM
Question:
I have seen risers that extend the primary runner length on aftermarket water jacketed tubular manifolds like GIL.
Does anybody know of a manufacturer that makes these or am I imagining things?
Basically, it looks just like a riser but made up of 4 small tubes instead of one big tube. I attempted to draw it...
I feel these may get the runner lengths closer to where they need to be for < 5500 rpm marine engine operation.
Anyway:
I have read that cold exhaust = bad.
why are the manifolds water jacketed?
It seems like this would be the ultimate marine header:
1) primary runner would be greater than 30" long
2) exhaust water joins past the collector
3) posibly heat wrapped up to the collector
benefits:
. no more worries about reversion due to the large runner length; run any cam you want
. hot exhaust easier to push than heavy dense ehaust
. with a true tuned exhaust you can gain the benefits of the 4/7 swap cam that can not be gained with non tuned headers
. propper tuned length allows low end torque w/out backpressure and high end HP due to less restriction of conventional systems
. no need to worry about internal welds breakin and leaking
I have seen risers that extend the primary runner length on aftermarket water jacketed tubular manifolds like GIL.
Does anybody know of a manufacturer that makes these or am I imagining things?
Basically, it looks just like a riser but made up of 4 small tubes instead of one big tube. I attempted to draw it...
I feel these may get the runner lengths closer to where they need to be for < 5500 rpm marine engine operation.
Anyway:
I have read that cold exhaust = bad.
why are the manifolds water jacketed?
It seems like this would be the ultimate marine header:
1) primary runner would be greater than 30" long
2) exhaust water joins past the collector
3) posibly heat wrapped up to the collector
benefits:
. no more worries about reversion due to the large runner length; run any cam you want
. hot exhaust easier to push than heavy dense ehaust
. with a true tuned exhaust you can gain the benefits of the 4/7 swap cam that can not be gained with non tuned headers
. propper tuned length allows low end torque w/out backpressure and high end HP due to less restriction of conventional systems
. no need to worry about internal welds breakin and leaking