On Wednesday, June 4, 2014 9:15:55 PM UTC-4, wrote:
My son was wondering

if the difference in timing could be because one coil takes longer to

build up enough voltage to cause the spark plug to spark.

Eric


I doubt it. Assuming this is a Kettering type of ignicion, the way it works is that when the points are closed the current builds up in the coil. When the points open the magnetic field collapses which creates the high voltage. The condenser across the points keeps the voltage from arcing at the points. You might swap the condensers and see if that changes things. If it does one of the condensers is bad.

Dan