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Old 02-03-2021, 08:47 AM   #12
35fordtn
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Location: McMinnville, TN
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Default Re: Dual points for increased dwell??

Quote:
Originally Posted by Mart View Post
Michael (35fordtn) summed it up and his description fits in with my understanding.

1932 technology.

You need 30+ degrees dwell to charge the coil. To do that with the single points of the day the points gap would be too small.

Dual points allow 30 degrees + but allow each pair of points to open to an acceptable gap.

If you look at th early ford points, they are more or less a bellcrank where the lift at the heel is not significantly mulitplied into much extra movement at the points.

Many modern designs use the points rubbing heel located half way along a long lever with the points at the tip. so you get (I'm guessing) twice as much points gap generated relative to cam lift.

That is (in my mind at least) how they can use a single set of points in a V8 application and generate both a decent dwell angle and an adequate points gap.

Mart.
Exactly Mart. If Ford had thought of the more modern design with the rubbing block closer to the pivot point single points would have been all that was needed on the V-8's.
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