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1937 115 vs 1938 six distributor
#1
Just can't stay away
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JRPackard37
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Hello,

Is there a difference besides model numbers for the Delco 1937 115 distributor vs the 1938 delco six distributor. I know that the model numbers that Delco gave them where different but besides that it looks like the points, condenser, and vacuum advance are interchangeable.

I just noticed that my 1937 115 which has had a 1938 engine in it still has the distributor model for a 1937 engine in it. Is it ok to interchange them as was done.

Thanks

James

Posted on: 2020/5/11 18:48
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Re: 1937 115 vs 1938 six distributor
#2
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HH56
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According to the 37 and 38 model introduction specs in the service letters the same Delco dist was used on both years but there are a few very minor detail changes. Timing spec is different and point gap is different. Wonder if they might have changed the gap to open the points more or longer for a bit better spark and maybe changed the weight or springs for a different centrifugal advance curve. For having the same part number on the basic dist doubt there is much more they would have changed without going to a new number. Is it the Delco number you found to be different or the Packard part number? With such minor differences I would think the dists would be interchangeable.

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Posted on: 2020/5/11 19:21
Howard
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Re: 1937 115 vs 1938 six distributor
#3
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Owen_Dyneto
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I haven't looked it up but the most likely difference would be a small change in either the centrifugal or vacuum advance profiles, or both, due to the larger displacement of the 1938 motor. Just as a generalization, best performance will be with the correct one though the difference may be small.

Posted on: 2020/5/11 19:24
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Re: 1937 115 vs 1938 six distributor
#4
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BDeB
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The centrifugal advance curves are the only difference.
The 1937 and 1937-38 shop manuals on this site show the following advance numbers for distributor RPM:

1937 Start @ 300, 1-3/4 to 3-1/4 @ 600, 9-14 to 10-3/4 @ 2000

!938 Start @ 300, 4 @ 800, 8-1/2 @ 2000

In addition, I have a 1942 Delco catalog that shows advance weights and springs for 1937 647-E distributors with a serial number greater than 27000 the same as the 1938 1110203 distributor so it looks like there was a running change.

Posted on: 2020/5/11 19:46
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Re: 1937 115 vs 1938 six distributor
#5
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JRPackard37
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Thanks for the information from everyone

Posted on: 2020/5/11 21:48
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