Re: Dwell

Posted by Bob M on November 26, 2003 at 15:23:24 from (66.66.126.128):

In Reply to: Dwell posted by Clete on November 26, 2003 at 13:25:22:

I gotta disagree with Michael on this one...

"Dwell" is the angle of crank rotation (measured in degrees) the ignition points are closed per distributor firing impulse. Dwell thus affects the time available for the coil primary to build up current hence how strong a spark is created when the points open. Dwell also is another way of expressing point gap presuming the distributor cam lobes are not worn. If point gap is too large, dwell angle becomes small, coil current does not build up fully and the spark is weakened. Conversely if point gap is too small, dwell angle increases and the points may not open far enough to break the primary circuit. Result is again a poor spark and burned points. As Michael suggests, dwell is pretty much meaningless at the speeds Farmall engine's run. It only becomes significant on 6 and 8 cylinder engines running faster than several thousand RPM.

Only way I know to measure dwell is with a tach-dwell meter. (Any mechanic who wrenched on cars before the advent of electronic ignition will have at least one tach-dwell meter gathering dust on a shelf in the garage�) However if you set your point gap correctly dwell will then be correct too.

Hope this makes sense...

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