Max:
There is a very good book "The Sports Car Engine" by Colin Campbell that gives
much information about tuning small English engines. The relevant section also
discusses the resonance in an induction system. My copy was printed in 1968,
but it would contain information applicable to engines of that period.
The following data is from a graph in that book:
"We must emphasize that the above results are based on two engines and only
cover what is to us the middle speed range. The writer, however, has used the
design data from these tests for many years and when circumstances have
prevented him from using a dynamometer to tune the induction system he has used
the curve of Fig. 93, based on a value of t=85 degrees,, to determine the
correct induction pipe length. It is not often that the results are found to be
in error."
Title "Optimum induction pipe length for different engine speeds. The effective
pipe length is measure from the valve head."
Y axis is "Induction Length for Maximum Ram, inches
X axis is R.P.M.
(2000,47)
(3000,30)
(4000,24)
(5000,18)
(6000,16)
(7000,13)
(8000,12)
I've scanned the graph in if anyone wants to see it.
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