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On 15 May 2002, at 20:12, Marc Bona wrote: > >In a distributor for carb engines, the spring tension for the vacuum > >advance is adjustable. The pin in the dist. body that the spring > >attaches to is an excentric. > > Could this possibly be a way of > tuning the advance curve on these distributors? Exactly. It changes the point at which the advance starts. The slope of the advance curve is determined by the spring constant of the return springs and by the size of the vacuum can diaphram, the size of the springs (if any) inside the vacuum can, and the properties of the vacuum pickoff in the carb. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe