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02-20-2019, 04:51 PM | #1 |
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Join Date: Jul 2010
Location: upstate NY near Mass border
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Dizzy side hole
I'm looking over the three dizzy's that I need to rebuild and all have a difference in the dimension of the slot where the upper plate timing lever sticks out. One measures 1" wide by 3/8" high. Another measures 1 and 1/4" by 3/8" high. The third is smaller and measures 3/4" wide by 3/8" high. I think the first one is correct but I thought I had better ask. Thanks Jack
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02-20-2019, 05:07 PM | #2 |
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Re: Dizzy side hole
I would only guess without seeing a picture of all of them. The last one 3/4" wide possibly an older one. The others will give you more advance timing range. Either way Ford advised to not trim the opening in the body. It was made to limit the angle to 20degrees.
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02-20-2019, 05:17 PM | #3 |
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Re: Dizzy side hole
Later distributor bodies have "webs" to reinforce where the bale clips attach with rivets.
Earlier not so much. Joe K
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02-20-2019, 05:24 PM | #4 |
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Re: Dizzy side hole
the narrower slot was used until the end of 1930. the early levers were narrower than the later levers. The maximum advance was 20 distributor degrees and 40 crankshaft degrees.
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02-21-2019, 08:27 AM | #5 |
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Re: Dizzy side hole
If you widen the slot, NO big deal!!! Learn your cars' sounds & adjust the spark lever accordingly.
Bill Ta-Ta-Ta- Dum
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02-21-2019, 10:04 AM | #6 |
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Re: Dizzy side hole
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Some folks time the engine with the spark lever down a few notches because they know from experience, it makes their Model A's run well. I suggest that you use the distributor body with the widest opening that permits the greatest amount of full advance, and iterate the timing by adding lever-down notches until you find the maximum advance that your engine will tolerate.
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02-21-2019, 03:55 PM | #7 |
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Re: Dizzy side hole
Thanks to all. I think I will use the 1 and 1/4 one because it is brown and I like the contrast. Jack
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02-21-2019, 04:49 PM | #8 |
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Re: Dizzy side hole
Seems to me that timing the engine with the spark lever down a few notches will REDUCE the amount of possible advance. What am I missing?
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