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ACinSC 
Orange Level
Joined: 16 Dec 2015
Location: South Carolina
Points: 2721
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 Topic: CA vs C
Posted: 28 Aug 2023 at 4:23pm |
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What's the difference between the two? One's a 3 speed and one's a 4 ? Just wondering. Thanks
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 80183
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Posted: 28 Aug 2023 at 4:37pm |
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.
Edited by steve(ill) - 28 Aug 2023 at 4:38pm
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Like them all, but love the "B"s.
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 51355
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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... 
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Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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ACinSC
Orange Level
Joined: 16 Dec 2015
Location: South Carolina
Points: 2721
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Posted: 28 Aug 2023 at 4:57pm |
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Thanks Steve and Dave
I see both on marketplace pretty often.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 80183
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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.
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Like them all, but love the "B"s.
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Les Kerf
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Joined: 08 May 2020
Location: Idaho
Points: 748
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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 
Edited by Les Kerf - 28 Aug 2023 at 6:34pm
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ACinSC
Orange Level
Joined: 16 Dec 2015
Location: South Carolina
Points: 2721
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Posted: 28 Aug 2023 at 7:01pm |
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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 !
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Dale (Stonelick)
Bronze Level
Joined: 13 Jun 2019
Location: Stonelick, Ohio
Points: 179
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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.
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1951 CA - 1944 C - 1949 B - Kubota M6800
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dfwallis
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Joined: 09 Mar 2023
Location: DFW
Points: 584
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Posted: 29 Aug 2023 at 11:43am |
 ACinSC wrote:
What's the difference between the two? One's a 3 speed and one's a 4 ? Just wondering. Thanks |
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
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Joined: 16 Dec 2015
Location: South Carolina
Points: 2721
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Posted: 29 Aug 2023 at 11:54am |
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Gary , that was part of my confusion . I thought they were both 18 HP ? Thanks
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 80183
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Posted: 29 Aug 2023 at 12:29pm |
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Higher compression pistons and different governor spring to increase the RPM.
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Like them all, but love the "B"s.
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dfwallis
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Location: DFW
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Posted: 29 Aug 2023 at 12:58pm |
ACinSC wrote:
Gary , that was part of my confusion . I thought they were both 18 HP ? Thanks |
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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ACinSC
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Joined: 16 Dec 2015
Location: South Carolina
Points: 2721
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Posted: 29 Aug 2023 at 2:06pm |
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Thanks guys.
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Lars(wi)
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 7078
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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.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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sparky
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Joined: 13 May 2011
Location: So. Indiana
Points: 1525
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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.
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It's the color tractor my grandpa had!
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