Re: 1937 115 vs 1938 six distributor
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Forum Ambassador
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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.
Posted on: 2020/5/11 19:21
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Howard
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Re: 1937 115 vs 1938 six distributor
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Forum Ambassador
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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
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Home away from home
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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
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Just can't stay away
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Thanks for the information from everyone
Posted on: 2020/5/11 21:48
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