Quote:
Originally Posted by katy
How "hot" do they have to be?
|
My coil tester has a Heat mode built in where the instructions say to test the coil first, then place the switch onto Heat mode for 10 minutes or until it feels quite warm, then test again. I will tell you that a good many Model-A coils have only a marginal spark with this tester. A modern reproduction coil be in the mid-range of the good section.
Notice in my picture below just how far the spark is jumping however also notice that range is considered poor to questionable at best. I have tested some Model-A coils that were in the good range, so my theory is many Model-As are running around with poor performing coils. If they have an engine with lower compression, they likely don't realize the lack of performance.
.
.