Quote:
Originally Posted by Purdy Swoft
Check the gaps at the rotor tip on all contacts in the distributor cap body . A lot of times the gaps will be all over the place in some reproduction distributor caps . Ford recommended a conservative gap of twenty five thousands . For hotter spark at the spark plugs I run a gap of thirty five thousands at the rotor tip . Jumping a wider gap ,to a point will increase the spark intensity . Too much gap will advance the timing to the point that it will run poorly if at all . Running too rich could be the cause of darkening of the motor oil . A hotter spark should help ignite the raw gas .
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"Too much gap will advance the timing to the point that it will run poorly if at all." Actually, the amount of rotor gap (or plug gap) has no measurable effect on timing. Secondary voltage rise in the coil is too rapid (milliseconds) to affect when the spark will occur, but if anything, in theory the spark will occur later with a larger rotor gap.