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Old 08-20-2019, 06:34 AM   #7
Frank Miller
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Join Date: May 2010
Location: Auburn, MA
Posts: 2,106
Default Re: Gap between rotor arm tip and distributor cap contacts

An electrical engineer can give a better explanation but here is a rough idea. A coil is a building and collapsing magnetic field and how it collapses has an effect. The plug fires in a compression and is the end point for the circuit so that gap is a different effect from the one on your distributor rotor. You can actually pull a plug wire and watch and inch long spark fire a plug. Amazingly this is a fix to get a fouled plug to fire. Go figure. I believe the Model a had a spec for this as you can separate the cap and easily measure the gap.
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