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Bill Verburg Bill Verburg is offline
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Join Date: Dec 2000
Posts: 23,131
Does anyone have any evidence that boat tailing the webs makes a difference on relatively modern ('83+) 911 motors turning less than 6500rpm?
I do know that c/c pressure is an increasingly big problem as displacement and revs go up. I've seen the cylinder base seals blown out.

The dry sump creates a partial vacuum which alleviates the problem but not totally.

Cup cars use a one way valve to create even more vacuum.
Bill Verburg
'76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone)
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Last edited by Bill Verburg; 07-04-2005 at 08:12 PM..
Old 07-04-2005, 05:23 PM
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