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Dale Rogers wrote:
Lehanover@aol.com <mailto:Lehanover@aol.com> wrote:
On the exhaust side ...
Primary lengths in multiples of about 11" to 12". A straight run out of the port as long as possible before the first turn. Both primaries the exact same length, and entering the collector in exactly the same angle.
Did Lynn just answer my earlier question? Is 11-12" the distance an
exhaust pulse travels before the next one starts into the pipe? (Assuming, say, 6500 RPM?)
Dale R.
COZY MkIV #1254
No. It's half the distance 8*)
When a wavefront in a pipe encounters an opening or radical expansion, it sends a negative wave back to where it came from. In tuning, you want that negative pulse to hit the exhaust port just as the next pulse is starting. 11-12" is half the distance the pulse travels.
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