Quote:
Originally Posted by SSE 4 2SS
It primarily has to do with LSA and then duration... If the LSA is too small, then the exhaust and intake valves are both open at the same time... This can also be affected by the duration. The exhaust valve can still be open when the intake valve opens, thus, boost swirls through the chamber and out the exhaust valve...reduction in boost...limit the duration, and open the LSA and you retain the boost where you want it, in the cylinder... Basically, you want the exhaust valve closed when the intake valve opens...
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This, very much!
Quote:
Originally Posted by Dangeruss
So is anything else limited at that point? Lope? Power?
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Lope is created by LSA....what you're hearing is the valves both being open at the same time. You can retain power with a cam and a blower by using a narrow LSA to limit the amount of time the valves overlap.
I'm on a 113 LSA.....sounds great, but not what you want with a blower.
Quote:
Originally Posted by Supercharged SS
PQ, have you thought about bigger headers if you do a cam. There might be some gain if you do. I didnt read this entire thread but don't you have 1 3/4's.
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Bigger headers hurt boost....same thought process, air is leaving in more volume...that's why you have to swap the pulley out to get back boost lost with headers.