Posted by CenTexFarmall on February 12, 2008 at 12:22:52 from (172.167.1.246):
In Reply to: Re: Vertical exhaust posted by Bob Kerr on February 12, 2008 at 10:19:33:
While it is possible to "Ram tune" a vehicle exhaust system, I don't think we have that going on with the Farmalls.
The ram tuning only works within a narrow RPM range. Also you'll want a relatively freeflowing exhaust with individual pipes going to each cylinder. The idea is to time the "reflected" pressure wave from an exhaust pulse with the opening of the exhaust valve so that negative pressure exists at the exhaust valve as it is begining to open. As rpm changes, so does the timing of the pulses and at some point you have positive pressure and inhibited exhaust flow. I guess if you could invent an exhaust pipe that changes length with RPM you could make it work over a wider range!
With a typical cast iron manifold that dumps all the cylinder more or less into a "log", the ram tuning effect is basically lost.
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