Thread: 30 degrees of advance at idle?

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Originally Posted by DennyW

.....Besides, the vacuum wouldn't start coming in until you reached the mid-upper rpm's anyway. Same as the ported vacuum does. ...

Denny, I am very confused by this comment, do you mean the vacuum would not start coming in until mid to upper rpms with manifold vacuum? When my engine is at idle, it pulls vacuum of 20. That is the max vacuum ever from the manifold, and therefore maximum vacuum advance.

Also, the one part about this I still don't get (about the overheating issue) is that I was taught that the more advanced the timing is, the hotter the engine will run. Using manifold vacuum will have the most timing at idle when you are sitting in traffic. I'm sure there is something I'm missing if you can help clear it up for me.