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I dug up an old post of mine (2004) showing the relationship between runner length and harmonics.
Edit: never mind you need to be registered on that forum to view attachments, so I just re attach it here.
In certian RPM ranges its like having free turbo or super charger boost.
I have found a lot of runners like to be right around 24 inches.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
Last edited by oil pan 4; 01-31-2012 at 04:19 AM..
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