Quote:
Originally Posted by gator2511
The pdf file posted by Billa is very good with one exception. The author states "and, since most vacuum advance control units pull in about 16 degrees of vaccum advance at cruise speed (where the full centrifugal advance will also be deployed), the 36 degree setting will produce 52 degrees of total combined advance at cruise with the vac advance fully deployed."
I don't know about you but I don't have full mechanical advance at cruising speed. I have always set my mechanical advance to be fully deployed at around 3,000 rpms. I would have to be cruising at 100 mph to get to 3,000 rpms and cut in FULL mechanical advance.Maybe I'm not getting something but if your throttle plates are open enough to get 3,000 rpms your manifold vac will be very low. If I'm reading this wrong please educate me.
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Completely agree that mechanical should be all in before 3000 RPM; what do use cruise at? With 3.08s and a 3 speed, I cruise at 2750...and have set my mechanical advance accordingly.
Typically at cruise manifold vacuum is enough to get most of the vac advance in; 4-5 inches.
The biggest help here is to know what your cruise RPM and manifold vacuum is - this isn't hard to get
