A- C history question

J. Schwiebert · Sep 21, 2014

Where did A - C use a Waukesha UMA engine

Lonnie Smith · Sep 21, 2014

Could you give the bore and stroke of a UMA? The WC had a 3.625x4.5, 186 ci and the B had a 3x4 at 113 ci. Off hand I can't think of another Allis with a Waukesha but there might be one?

J. Schwiebert · Sep 21, 2014

I though LeRoi made the WC engines. These Waukesha engines are older than that.

ACEd · Sep 21, 2014

According to Norm Swinford in Allis Chalmers Farm Equipment 1914-1985, the U and UC tractors initially used a Continental engine which was replaced by an Allis UM engine "manufactured by Waukesha" for AC beginning in 1932.

I am unclear as to whether this was an AC design or a Waukesha design or a joint venture. You may be aware of a similar question on the JE engine in the Minneapolis Moline / Twin City JT tractor initially claimed as a MM engine but later identified as a Waukesha engine after the RE engine came out in the Z.

The original UM engine was 4.375 x 5 (300.7 ci). In 1936 the bore was increased to 4.5 in (318 ci). The UMA designation appears as a motor s/n prefix on the 318 ci version from 1936 to at least 1953.

AC also used Waukesha L-head engines for the first 29 WC tractors (3.625 x 4.5 or 186 ci) and for the first 101 B tractors (113 ci) before switching to their own engines. But this has nothing to do with the larger UMA engines.

David R Inman · Sep 21, 2014

According to Norms AC farm equipment, the first 25 WC's had 3.625 bore, 4.5 stroke, 186 ci, 1300 rpm Waukesha motors, and the first 96 B's had 3.00 bore, 4.00 stroke, 113ci, 1400 rpm Waukesha motors. I could be overlooking somthing in the book (its a scan, not as easy to leaf through), but only other tractors without Allis built motors are the 6-12 with a LeRoi, the 12-20 with a Midwest of Indinapolis, the U pror to SN 7405 with a continental, and the G with a Continental. Im excluding crawlers.

David R Inman · Sep 21, 2014

ACEd,
Funny we should both post quoting from the same, wonderful, under printed book at the same time, and get diffrent numbers for how many WC's and B s had Waukesha motors.

For the sake of the other readers here at YT, I get 25 WC's from page 53, and 96 B's from page 47.

ACEd · Sep 21, 2014

I may have misspoke - my reference was to S/N break points 29 and 101 - but real point was they have nothing to do with the UMA question and the previous response that UMA engines may have been used in WC was incorrect.

ACEd · Sep 21, 2014

To cut to the chase - UMA engines were used in AC U / UC tractors 1936 thru at least 1953. UM were used 1932-36. Only question in my mind is whether they were Waukesha engines or AC design made by Waukesha and if the later, did AC take over production at some time.

Hope that helps. Ed

J. Schwiebert · Sep 22, 2014

Thanks for the help. I knew early model B had the Waukesha (kind of like an early -12 IH) I did not know about the WC. This was in a Waukesha book telling that in the 30's A-C and Oliver were there big tractor engine customers. Thanks again. J.

ACEd · Sep 22, 2014

Would be interested in Book details - I know Waukesha supplied AC, MM, Oliver, Case (VAC) and others. But having problems finding info on JE engine made for MM in the 1930s.

JimIA · Sep 22, 2014

The UM engines were designed by A-C and were contracted to be built by Waukesha. I had found this out through the internal historical society through Waukesha.

Jim

A- C history question

J. Schwiebert

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Lonnie Smith

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J. Schwiebert

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ACEd

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David R Inman

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David R Inman

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ACEd

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J. Schwiebert

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ACEd

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JimIA

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