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1937 115 vs 1938 six distributor
Quite a regular
Joined:
2017/10/23 18:59
From Rochester
Posts: 33
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: 5/11 16:48:41
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Re: 1937 115 vs 1938 six distributor
Forum Ambassador
Joined:
2007/4/20 17:54
From Fresno CA
Posts: 15638
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.

Attach file:



jpg  37-38 dist.jpg (139.64 KB)
209_5eb9ebe5319ad.jpg 1444X416 px

Posted on: 5/11 17:21:37
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Howard
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Re: 1937 115 vs 1938 six distributor
Forum Ambassador
Joined:
2007/3/14 16:01
From New Jersey
Posts: 16014
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: 5/11 17:24:08
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Re: 1937 115 vs 1938 six distributor
Home away from home
Joined:
2008/11/28 17:50
From Calgary, AB Canada
Posts: 867
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: 5/11 17:46:21
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1949 Custom 8
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Re: 1937 115 vs 1938 six distributor
Quite a regular
Joined:
2017/10/23 18:59
From Rochester
Posts: 33
Thanks for the information from everyone

Posted on: 5/11 19:48:35
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