dwell setting

Samuel Chapman · Jul 19, 2008

Can anyone tell me how to find the dwell on a 'B' w/ batt.ignition. I've been chasing point settings for 2 weeks. Some play in the shaft, but not extreme. I have a dwell meter and am getting 60-68% dwell, which converts to about 54-62 on my 4 cyl scale, but I don't know what it should be? Any suggestions? PLEASE HELP Thanks, Sam

Wayne in MN · Jul 19, 2008

Divide 360 degrees (circle) by the # of cylinders.
360 / 4 = 90. Dwell time (points are closed) should be 2/3 of that amount. 90 X 2/3 = 60 degrees of dwell for 4 cylinders.
Just set the point gap at .020" and forget the dwell. Tractors are not that fussy when running at 1850 rpm.

Red Mist · Jul 19, 2008

(quoted from post at 11:38:08 07/19/08) Divide 360 degrees (circle) by the # of cylinders.
360 / 4 = 90. Dwell time (points are closed) should be 2/3 of that amount. 90 X 2/3 = 60 degrees of dwell for 4 cylinders.
Just set the point gap at .020" and forget the dwell. Tractors are not that fussy when running at 1850 rpm.

The perfect answer, Wayne. Good job.
mike

Samuel Chapman · Jul 22, 2008

Thanks Guys, I've set the points @ .020 numerous times but my shaft must be worn worse than I thought because it changes after I run it then check it again. I was setting points on cars when you had to, so I've had plenty of practice. Anyway, I finally got the dwell very close to 60^ and it runs pretty good. I also ordered a shaft, bushings, and an electronic ignition. Thanks again, Sam Lone Jack, MO

dwell setting

Samuel Chapman

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Wayne in MN

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Red Mist

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Samuel Chapman

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