Re: 52 200 distributor question

Posted by Tim Cole On 2012/1/15 12:57:28

Dear Packard 1949:

No. The vacuum advance is not active during idle conditions.

The unit uses what is called "ported vacuum" and becomes active under part throttle acceleration and low to moderate rpm cruise conditions when more ignition advance is allowable.

Modern cars use a computer program with data cells for given throttle and load conditions. The vacuum method is a mechanical approximation.

Hope this helps.