Peripheral Port sleeves
#13
Originally Posted by PDF' post='897877' date='Apr 4 2008, 04:04 AM
For your application 42 or 43mm ID and the same port timing and shape as MFR housings. Twin 2in OD primary pipes (90-100in long) into a 2.5in OD collector then a short 2.5 - 3in megaphone and out through your rear muffler.
how important is the megaphone?
#15
Not sure exactly how important the megaphone is but a lot of top cars use them as did Mazda race teams. From what I gather 2.5 - 3in for street and 2.5 - 4in for race.
90 - 100in primary length works for me. In saying that I have yet to try a short header e.g 12 - 14in.
90 - 100in primary length works for me. In saying that I have yet to try a short header e.g 12 - 14in.
#16
Hrm, thats interesting. I just figured that since most stock port headers run close to a 24" primary runner (RB, paceshitter, SDJ ect), a short runner header on a high rev motor would make more since? I suppose that longer primaries could compensate some low end performance, but Ive never heard of anything in eccess of the norm 24".
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