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Rino,
I'll take a guess at this and say that the smaller
tubes should be different lengths for maximum tuned benefit - however as
the secondaries are for lower RPM , tuning them would be pretty much a waste of
time. Would the same length and different diameter ( speed) have a
detrimental effect on optimum performance on the primaries? I just don't
know.
Ed Anderson helped me with some maths to get to a
theoretical length but I just don't have it in front of me at the moment, but
this would only get you into the ball park as each motor is slightly different
to other installations. My calculations gave 21.36" for 2" PP. It would be
shorter lengths for smaller pipes as the velocity increases and could be between
18" and 21" in my unqualified opinion.
Testing is the only answer also my
calculations may be on erroneous assumptions.
Hope that helps.
George ( down under)
What would be the
prefered runner length to get the maximum power at about 6200 rpm on the Renesis
(6 intake ports). Is this a trick question. Well, it is not a trick
question , I want to build yet another intake manifold. This is becoming a
full time hobby for me.
I will go for Ed's
suggestion for 1 1/4" id for the two primaries and 1 1/2" id for the two
secondaries. Now tor the length?
The present
secondary runners are too large.
Rino
Lacombe
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