Re: Adjusting the Timing on a

Posted by Ross On 2022/6/26 7:32:45

If the idle is set just a little high then vacuum will be directed to the vac advance and you will get a false reading. So especially on an engine where many and unknown hands have diddled it is a good idea to disconnect the line. There is no need to plug it. Then with the engine idling slowly so that the centrifugal advance is not kicking in you can set your timing.

I have had cars in where the timing was set massively retarded because the idle was high and both the centrifugal and vac advances were operating when the baseline was set. They will run hot and have no power.