bravenrace
bravenrace SuperDork
12/3/10 8:30 a.m.

Anybody know a good manual formula for calculating primary tube and collector diameter?

oldeskewltoy
oldeskewltoy Reader
12/3/10 12:01 p.m.

http://www.google.com/search?q=header+calculators&sourceid=ie7&rls=com.microsoft:en-us:IE-SearchBox&ie=&oe=

TJ
TJ SuperDork
12/3/10 12:02 p.m.

pasted from here

"You can roughly calculate primary internal diameter with this formula: ID = (The square root of cc/(P+3) x 25) x 2.1 Where: ID = Inside Diameter cc = Cylinder Volume in cc P = Primary Length

Having a tube with a slightly larger cross sectional area than the exhaust port is a decent starting point as well."

TJ
TJ SuperDork
12/3/10 12:20 p.m.
Paul_VR6
Paul_VR6 Reader
12/3/10 12:50 p.m.

Fill out the Burns header sheet and have them give it to you.

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