jtothawhat is about to bust a 1.6
#184
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Looking at Brain's quote regarding scavenging, it appears that the same scenario that benefits number 2 cylinder would also benefit number 3 because number 4 is opening before number 3 is closed and they are adjacent. Jtothewhat's manifold should likely increase the efficiency of both number 2 and 3 cylinders at all RPMs. The amount of benefit is going to be greater with engines using larger camshafts because the duration of the overlap would be more significant.