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e170drvr e170drvr is offline
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Join Date: Sep 2006
Location: Evansville IN
Posts: 261
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Interesting thread here guys. I think what confuses me most is the fact that there were so many variations on the dizzys of our 930s over the years. When I see a post describing the pot actually retarding the timing it is confusing, since my 87 us model does not seem to do that. It only retards in the absence of vacuum, it does not respond to positive pressure at all. It seems that the pot in my car is only there for emmisions and cold starting. the retard port is blocked during start-up increasing the idle when it warms the pot sees vacuum. on the advance side the pot sees vacuum increasing timing during warm up, then a solenoid shuts the vacuum off, then with a warm engine the only function of the pot is for ignition retard at idle only, which is gone when you step on the gas. correct me if i'm wrong, i'm still trying to figure this thing out.

Eric
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87 930 Coupe Red, K27S, Kokeln IC, Rarlyl8 Headers system, Tial 46MM, .9 Bar. "Lola"

81 911SC Coupe Guards Red, Stock. "Zippy"
Old 04-09-2008, 09:50 AM
  Pelican Parts Technical Article Directory    Reply With Quote #33 (permalink)