It wasn't me that was induction tuning (it was Eric), but that's good info.
Though it looks like it would be hard to tune for "low-end grunt" -- that
42-inch ram pipe would look pretty funny sticking up out of the hood! Though
I suppose you could coil it up like an English horn...
on 11/28/01 12:56 PM, Bullwinkle at yd3@nvc.net wrote:
> 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.
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
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