Total timing?

[PKRWUD]

Originally posted by red82gt
I'm confused? Howcome my car hasn't detonated itself to death then? With the vacuum advance hooked up my car goes to about 50* advance @2500 and it doesn't ping but if I crack the throttle wide open with the light on it, the timing falls to my original 32* mark? Vacuum advance is mostly for fuel mileage, otherwise why would a lot of performance distributors not have it? This is the website I've been reading... http://www.fordmuscle.com/archives/2...ng/index.shtml

Ahhhhh! I now see why you are confused. That article is incorrect. If you read the sidebar right next to it, where it says "Tuning Vacuum Advance", you will see that they contradict themselves. The sidebar is correct, the article is mistaken.

The reason that you setg the base timing with the vacuum disconnected is so thet you can accurately set it. If the vac was hooked up, you wouldn't know how much of your advance was mechanical, and how much was vac. BUT, you MUST include the vacuum advance in your calculations.

Hope this helps.

Take care,
~Chris