Finding firing point

ChuckZZ

Member
We all know that flathead coils retard as RPM goes up and the only dependable way to properly set timing is to find and mark the flywheel with a timing light. But at what RPM do you make the mark?
 

flattop1

Dawg 89
The mark is a reference point .
Depending on what your after or how you want to set the timing .
Most use static , so at an idle or roll over speed if using a starter .
Now if you want 34* at 6000 rpm its a little more complicated .
 
We all know that flathead coils retard as RPM goes up and the only dependable way to properly set timing is to find and mark the flywheel with a timing light. But at what RPM do you make the mark?
You want it at (or near) peak torque ~4000 rpm on a stocker. That's where ignition timing is most critical.
The mark itself is just a reference. The actual firing point is as the trailing edge of the magnet is directly under the right hand most edge of the D shaped pick-up module (located under the coil body.) Most builders will simply place their chalk mark on the flywheel at the right coil leg for easier visibility.


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