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Old 02-13-2018, 10:25 PM   #50
40 Deluxe
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 2,816
Default Re: Replacement Ignition Coil

Originally Posted by gustafson View Post
40 Deluxe, suppose a brand new coil fires a split second sooner when the points open, that would be the same as more advance. And something that would be both hard to measure and the resulting increase in RPM of no meaning; would love to know your test results
Mr Swoft how many would be concerned about compression blowing out a spark with a 4.2 head at 2200 rpm. A 10:1 head at 7K, that would be different .
Spark, timing, coils, points and such can be confusing and could be a great thread to clarify from. To many, timing and ignition and spark is just shoving a pin in a hole
OK, did my idle test this afternoon. I did it on my '40 Ford, all stock with the exception of a remote coil adapter on the original helmet distributor. The coil is a 6 volt 1.5 ohm Echlin of unknown vintage, but old. The engine idled at 610-615 RPM. I then mounted a new out of the box 12 V. Bosch 012 coil and powered it with jumpers directly from a 12 V. battery. The engine idled at 595-600 RPM. Reconnected the first coil and idle RPM went to about 605 RPM. Revving in neutral, both coils sounded the same.
So no RPM increase for me.
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