Adjusting Distributor Vacuum advance retard, How do you do it? |
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Adjusting Distributor Vacuum advance retard, How do you do it? |
porsche735 |
Sep 9 2003, 10:01 PM
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#1
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Member Group: Members Posts: 189 Joined: 10-January 03 From: Los Altos, CA Member No.: 127 |
So, we seem to have found the source of our blown pistons and ring lands! Our distributor (off a fresh rebuild I might add), does not have enough vacuum retard at WOT. Turns out we were way too far advanced (about 38-40 degrees) under load.
My question is, how do you adjust the vacuum unit? The advance and retard work when you pull a vacuum on them. However, I suspect that the adjustment screw is not adjusted properly. It is almost all the way out. Does anyone know how to get this speced right? Thanks for your help, Chris |
Bleyseng |
Sep 9 2003, 10:24 PM
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#2
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
According to the stuff I have read, the vacuum advance should be full on by 2500rpms and not affect the advance after that. Brad Anders did some testing last year on this and what the difference having the vacuum advance hooked up or not did.
Hell, just plug the vacuum advance hose and tune the engine to get it running right, then plug the hose back in. The car should run great without it as it is supposed to help only between 1500-2500 rpms. Geoff |
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