here is one useful link that I found when googling..
it describes the basics of concept and gives some calculations.. which may be useful for some members who are interested in mods
http://www.stealth316.com/misc/grapeape-inductionsystems.pdfhere is a example
"The Helmholtz resonator theory does work well, however, it is limited to how many cylinders can
operate off a single plenum. To be effective, no more than 4 cylinders should be used in a single
plenum. This set up is very effective on 6 cylinder engine with two plenums, each plenum feeding 3
cylinders. To make matters worse, the cylinders must be even firing, so simply dividing banks of a V6
or V8 will not work unless the banks each fire evenly. For a V8, the best solution is to use a 180
degree crankshaft to even out the firing order of each bank. Then the Helmholtz resonator can be
applied as if it were a pair of 4 cylinders. It is possible to see small gains at low rpm
with using one plenum for 8 cylinders, but this will usually lead to a reduction in top-end power. There
are 3 tunable aspects of the Helmholtz resonator, the plenum volume, intake ram pipe, and intake ram
pipe diameter. "
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Topic: short runner or long runner plenum (Read 1739 times)