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Re: some header questions..... Posted by DavidC [Email] (#194) [Profile/Gallery] (more from DavidC) on Wed, 28 Nov 2007 18:26:24 In Reply to: some header questions....., Smeter, Wed, 14 Nov 2007 07:33:39 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Consider thinking about your primary pipe length a bit.
Estimate of Primary Pipe Length (in)
EXHAUST VALVE OPENING IN DEGREES BEFORE BOTTOM DEAD CENTER BBDC
RPM 50deg 55 60 65 70 75 80 85 90deg
4000 46.0 47.0 48.0 49.0 50.2 51.2 52.0 XX XX
4500 40.5 41.3 42.3 43.2 44.3 45.1 46.0 47 48.0
5000 36.2 37.0 37.7 38.6 39.5 40.4 41.0 42.0 48.0
5500 32.6 33.2 34.0 34.8 35.7 36.4 37.0 38 38.8
6000 29.6 30.3 32.0 31.7 32.5 33.1 33.8 34.5 35.4
6500 27.2 27.6 28.4 29.0 29.8 30.4 31.0 31.7 32.4
7000 25.0 25.5 26.0 26.7 27.5 28.0 XX 28.6 29.2
7500 23.0 23.6 24.2 XX XX XX XX XX XX
8000 21.5 22.0 22.5 XX XX XX XX XX XX
8500 20.0 20.5 21.0 XX XX XX XX XX XX
Primary Length P (in) = 800*ED/RPM -3
Where
ED = number of degrees Before Bottom Dead Center
RPM: that header is tuned to work best at
Primary Pipe Inside Diameter (in) = (cc/(P+3) * 25) * 2.1
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