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Quote:
Originally Posted by Ol' Ron
The flathead actually has 4 exhaust ports on each side, because one is used twice at different parts of the engine cycle. Now this could benefit exhaust tuning by creating a vacuum in the exhaust header. The firing order fires the end cylinders on the first revolution of the cycle and the center ports on the next revolution. Thus the center port has two power pulses for each engine cycle. Maybe we could take advantage of this in a new header design. Think fellows, think
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Back in the 50's when I had unlimited free access to a dyno, I tried 3 different exhaust systems on a 315 ci flathead circle track engine.
1- Standard 1.75 dia. 3 pipe swept back street type headers.
2- Home made 2 inch dia "W" type header with baffle in center at big flange
and reverse flow dams at the ports.
3 - 2 inch zoomies with reverse flow dams.
The zoomies made the most power but we could not run them on the track.
We did run them at Bonneville though.