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Purdy Swoft · 02-12-2018, 01:07 PM

I believe that Ford increased spark plug gap to .035 before model A production ended ... Anyway , I have always set my spark plug gap at .035 on my model A's and most others with points ignition . Spark plug gap had nothing to do with the rpm increase after installing a performance coil . The reason being that the gap had allways been at .035 , not readjusted to .035 after the installation of the flame thrower coil .I agree that more spark plug gap , to a point better burns the fuel . I agree that spark plug gap increased with the introduction of electronic ignition . The coils would have had to have been improved to handle wider spark plug gaps . Standard , ( not necessarily brand) , replacement coils for points ignition will fail rather quickly If the gap is opened too wide ! I have used other performance coils and they all increased idle rpm and noticably improvement performance . This is my experience .

02-12-2018, 01:07 PM	#33
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Replacement Ignition Coil I believe that Ford increased spark plug gap to .035 before model A production ended ... Anyway , I have always set my spark plug gap at .035 on my model A's and most others with points ignition . Spark plug gap had nothing to do with the rpm increase after installing a performance coil . The reason being that the gap had allways been at .035 , not readjusted to .035 after the installation of the flame thrower coil .I agree that more spark plug gap , to a point better burns the fuel . I agree that spark plug gap increased with the introduction of electronic ignition . The coils would have had to have been improved to handle wider spark plug gaps . Standard , ( not necessarily brand) , replacement coils for points ignition will fail rather quickly If the gap is opened too wide ! I have used other performance coils and they all increased idle rpm and noticably improvement performance . This is my experience .