madkaw Posted August 4, 2013 Share #13 Posted August 4, 2013 No, you want to see what the total MECHANICAL advance is.The vacuum from the no load scenerio in your garage would probably pull in additional timing. Link to comment https://www.classiczcars.com/topic/39782-how-to-check-timing/?page=2#findComment-429077 Share on other sites More sharing options...
rcb280z Posted August 4, 2013 Share #14 Posted August 4, 2013 (edited) Doesn't he need to have the vacuum advance connected to check "vacuum advance"?Have I been doing it wrong all this time? Edited August 4, 2013 by rcb280z Link to comment https://www.classiczcars.com/topic/39782-how-to-check-timing/?page=2#findComment-429078 Share on other sites More sharing options...
beermanpete Posted August 4, 2013 Share #15 Posted August 4, 2013 Check the mechanical advance separately (remove vacuum hose) and then check the vacuum advance separately at idle by connecting the vacuum servo to a vacuum pump (Mighty-Vac) or manifold vacuum. Add the 2 together for the total. There are advance curves for each in the factory service manuals. If everything is working properly they will compare favorably to the factory data. Link to comment https://www.classiczcars.com/topic/39782-how-to-check-timing/?page=2#findComment-429085 Share on other sites More sharing options...
Yarb
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