In Reply to: Re: Points Dwell For Ford Tractors posted by Bruce (VA) on July 27, 2010 at 21:46:54:
Interesting discussion here. My understanding of point dwell is that the longer the points are closed, the more coil saturation time is available for the next spark event. It is for this reason that lots of hi-po cars back in the ignition points days of the fifties used dual points - to get still MORE coil saturation time for a hotter spark. Mallory made a blue million of 'em. I doubt increasing the dwell on an N distributor will result in much meaningful spark improvement, but a dwell meter is the very best method of checking point gap. You and me and Harry might each have a slightly different feel for that thickness gauge we drag through the point opening, but 50 degrees in Peeoria is the same gap as 50 degrees in Atlanta, etc.
I've found that one advantage of a 12-volt system is that I can use my dwell meter on the eistributor with the cap off, and get point gap right on the money, before I put the cap on and fire it. If the dwell varies from crank to run, I'd suspect bushing or housing wear.
A dwell meter is a pretty good diagnostic tool as well and can spot a bent shaft, worn bushings, bouncing points, etc. I'd be lost without mine, for sure.
Good Luck
Dave Erb
New Hollajd, AP
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