Like I really need to be typing more ....
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Originally Posted by oab_au
The interference pipe will extend the period of low pressure returned to the cylinder, but it will take a longer time. This is OK for low reving engine that can spend the time .... (snip)
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Or if the pipe was "too short" in the first place ? Wouldn't this accomplish the goal of allowing a shorter pipe distance from header to main cat and still having a favorably timed (albeit smaller amplitude) low pressure wave ?
I guess the one thing that's not clear to me is how "strong and sharp" the exhaust pulse is from a modern engine (like, say a Subaru ?) compared to the ancient beasts that Robertson, er, I mean Morrison, worked with. Maybe that's a factor that isn't considered in his work. But a sharp pulse reflecting off the closed end of an interference pipe will still produce a fairly sharp spike in the middle of the extended waveform travelling down to the resonator. It should be a copy of the original, more or less, reduced by half.
Cheers,
Jeff