CA vs C
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=196902
Printed Date: 01 May 2025 at 9:16am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: CA vs C
Posted By: ACinSC
Subject: CA vs C
Date Posted: 28 Aug 2023 at 4:23pm
| What's the difference between the two? One's a 3 speed and one's a 4 ? Just wondering. Thanks |
Replies:
Posted By: steve(ill)
Date Posted: 28 Aug 2023 at 4:37pm
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CA is a 4 speed, spin out rear wheels , better hydraulic pump , slightly heavier rear axle housings........... basically same engine , radiator, sheetmetal, tires... CA is a "newer model" of the C. a lot of the parts can be installed between the two as assemblies.
------------- Like them all, but love the "B"s. |
Posted By: DiyDave
Date Posted: 28 Aug 2023 at 4:48pm
Don't forget the CA has pto that will spin while the tractor slows or stops. Not exactly live pto, but much improved over the C... ------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |
Posted By: ACinSC
Date Posted: 28 Aug 2023 at 4:57pm
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Thanks Steve and Dave I see both on marketplace pretty often. |
Posted By: steve(ill)
Date Posted: 28 Aug 2023 at 5:56pm
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as DAVE said, the CA has a hand clutch on one rear axle to disengage travel while maintaining the main clutch drive thru to the PTO shaft... Thats an advantage... but 90% of the ones you buy WILL NOT WORK after 60 years... Most need rebuilt. ------------- Like them all, but love the "B"s. |
Posted By: Les Kerf
Date Posted: 28 Aug 2023 at 6:33pm
If your agility has diminished such as mine has, the C (and B) with the flat seat and backrest is fairly difficult to mount and dismount; the CA has a pan seat without the back rest and is somewhat easier for the aged and infirm  |
Posted By: ACinSC
Date Posted: 28 Aug 2023 at 7:01pm
| I hear ya , Les . My old D 15 is easy to climb up on . Especially with the nice step I bought from the guy on this site . Thanks ! |
Posted By: Dale (Stonelick)
Date Posted: 29 Aug 2023 at 11:18am
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I think of 10 improvements (1) HP, (2) hydraulics, (3) 4 speed trans, (4) heavier axle, (5) draft control, (6) seat shock, (7) hitch, (8) hand clutch [Rick rebuilt mine], (9) live PTO, and (10) spin out rear wheels. ------------- 1951 CA - 1944 C - 1949 B - Kubota M6800 |
Posted By: dfwallis
Date Posted: 29 Aug 2023 at 11:43am
CA also has an increase in horsepower of about 11% over the C. They increased the compression ratio to 6.25:1 and increased the max RPM (don't know what else). This in part to enable support for a 2-bottom plow.
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ACinSC wrote:Posted By: ACinSC
Date Posted: 29 Aug 2023 at 11:54am
| Gary , that was part of my confusion . I thought they were both 18 HP ? Thanks |
Posted By: steve(ill)
Date Posted: 29 Aug 2023 at 12:29pm
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Higher compression pistons and different governor spring to increase the RPM. ------------- Like them all, but love the "B"s. |
Posted By: dfwallis
Date Posted: 29 Aug 2023 at 12:58pm
After 70 years, most of them have probably been rebuilt with an "overbore" kit. That can further increase HP from about 26 stock to about 29, nearly equal to a stock WD.
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Posted By: ACinSC
Date Posted: 29 Aug 2023 at 2:06pm
| Thanks guys. |
Posted By: Lars(wi)
Date Posted: 31 Aug 2023 at 6:55pm
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My Father said the CA was the perfect tractor for the Roto-Baler. Just enough hp to notice the engine sound change as the hay condition changed during the day. Dad said a trained ear would know when the baler needed adjustment, by listening to the engine. ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
Posted By: sparky
Date Posted: 31 Aug 2023 at 7:12pm
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I’ve owned 7 CA’s and have 3 now. Just my opinion but pound for pound I believe that the CA’s were the strongest tractors Allis ever built. ------------- It's the color tractor my grandpa had! |