Quote:
Originally Posted by cdrazic93
but if the 4-1 manifold were designed in a way to pulse 4-2-3-1 in some calculated order, wouldn't that be close to if not the same thing?
edit: By no means am I saying Full Race has bad manifolds; if anything they have the best. That much can be concluded just with pictures, I'm speculating purely manifold style.
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The length of the runners in an exhaust manfold along with the diameter of the tube, and a few other factors that are beyond this discussion will determine a resonant frequency in the tube. At certain engine rpms this resonance will cause a low pressure area at the exhaust valve which will greatly aid in scavenging. By having a 4-2-1 design they've made it so the runner can resonate ate two frequencies, which if designed correctly will give a broader power band.
Try these for some further explaination.
This one explains header design basics.
http://www.team-integra.net/forum/bl...powerband.html
This one is about intake manifolds, but it does a good job of explaining the resonances.
http://grapeaperacing.weebly.com/uploads/4/1/2/0/41206275/inductionsystems.pdf