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On 24 Sep 98, at 10:50, Ross O'Shea wrote: > Attempt at logic: vacuum retard is to "slow down" timing at idle to > prevent overheating due to being stuck in damn traffic again - right > so far? With this working, timing is meant to be set at TDC at idle. > With this feature disabled, should the idle timing be set to > somewhere BTDC to advance to the same extent when not idling? If > this is true, how much? You have the right idea, but I believe that what was usually done was to set the timing to about 5 deg BTDC with the retard hose off, then install the retard hose. If you cannot install the retard hose, or the retard side of the vacuum unit is broken (very common, and very expensive to replace) then just leave it alone and live with the extra pollution. An alternative would be to find an appropriate distributor from another year that had only a vacuum advance. This will have more mech advance to make up for the extra 5 BTDC that you will be missing when you properly time this new distributor to TDC. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/