Size Variance in Exhaust Ports?
11-04-2005, 03:59 PM
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Size Variance in Exhaust Ports? Talking about 23° Gen I/II heads, but I know there are a lot of good head porters on this site. 
Is there any (good) reason for having the inner two exhaust ports on each head slightly narrower than the outer two? No variance in height, just in width, and the 4 "inside" ports are almost exactly the same size, and the 4 "outside" ports are almost exactly the same size.
Any thoughts?
Is there any (good) reason for having the inner two exhaust ports on each head slightly narrower than the outer two? No variance in height, just in width, and the 4 "inside" ports are almost exactly the same size, and the 4 "outside" ports are almost exactly the same size.
Any thoughts?
11-04-2005, 05:23 PM
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Originally Posted by Birdie2000
Talking about 23° Gen I/II heads, but I know there are a lot of good head porters on this site.
Is there any (good) reason for having the inner two exhaust ports on each head slightly narrower than the outer two? No variance in height, just in width, and the 4 "inside" ports are almost exactly the same size, and the 4 "outside" ports are almost exactly the same size.
Any thoughts?
Is there any (good) reason for having the inner two exhaust ports on each head slightly narrower than the outer two? No variance in height, just in width, and the 4 "inside" ports are almost exactly the same size, and the 4 "outside" ports are almost exactly the same size.
Any thoughts?
11-04-2005, 09:00 PM
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That's kinda what I thought, but why not just make the outer ports the narrower size as well? I'd think that the consistancy between the ports would be essential in a good tune.
11-05-2005, 08:21 AM
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Originally Posted by Birdie2000
That's kinda what I thought, but why not just make the outer ports the narrower size as well? I'd think that the consistancy between the ports would be essential in a good tune.
