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How Headers Work
by Mike Kojima
....Headers make more power three ways; by using gas column inertia pulse tuning to help evacuate the cylinder during the exhaust stroke, acoustic pressure wave resonance tuning to create a low pressure reflected wave rarefaction pulse during the overlap period and finally through a reduction in back pressure. If the first two reasons sound like a passage from “Hooked on Physics”, check out this simplified analogy. Some say a well built engine’s sound is music to the ears. Well this really is true; basically a header is a glorified musical instrument. A header is tuned in much the same way that an organ pipe is tuned but in this case the header is tuned to produce the right conditions in the cylinder to make power instead of a specific note on a musical scale.
CONTINUE HERE
http://www.motoiq.com/MagazineArticl...rk-part-1.aspx
by Mike Kojima
....Headers make more power three ways; by using gas column inertia pulse tuning to help evacuate the cylinder during the exhaust stroke, acoustic pressure wave resonance tuning to create a low pressure reflected wave rarefaction pulse during the overlap period and finally through a reduction in back pressure. If the first two reasons sound like a passage from “Hooked on Physics”, check out this simplified analogy. Some say a well built engine’s sound is music to the ears. Well this really is true; basically a header is a glorified musical instrument. A header is tuned in much the same way that an organ pipe is tuned but in this case the header is tuned to produce the right conditions in the cylinder to make power instead of a specific note on a musical scale.
CONTINUE HERE
http://www.motoiq.com/MagazineArticl...rk-part-1.aspx