b vs c
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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=46510
Printed Date: 07 Aug 2025 at 6:19am
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Topic: b vs c
Posted By: ewbs79
Subject: b vs c
Date Posted: 01 Mar 2012 at 7:17pm
| Ok I have my b going and I also have a c that is next to get running I know the c is a touch bigger but does it have more hp? Not really sure the differences between the b and c is basically what I would like to know if some people care to help a dummy out |
Replies:
Posted By: R.W
Date Posted: 01 Mar 2012 at 7:23pm
|
B and C have pretty much the same motor and HP if not identical. ------------- In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D |
Posted By: SteveC(NS)
Date Posted: 01 Mar 2012 at 7:28pm
| Yup, identical. |
Posted By: Hubert (Ga)engine7
Date Posted: 01 Mar 2012 at 7:36pm
|
Same motor. Different gear ratio and maybe a little more weight on the C will make a slight difference. Both are handy little tractors.
------------- Just an old country boy saved by the grace of God. |
Posted By: ewbs79
Date Posted: 01 Mar 2012 at 7:42pm
| I know the c is wider. Is 1sta gear. Slower |
Posted By: Charlie175
Date Posted: 01 Mar 2012 at 7:42pm
|
Final drives are the only major difference as the C is geared a bit different.Engine, sheet metal and transmission are the same ------------- Charlie '48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD |
Posted By: Protrucker
Date Posted: 01 Mar 2012 at 8:19pm
|
According to Tractor Data, The C has more horsepower.
B
C
|
Posted By: CTuckerNWIL
Date Posted: 01 Mar 2012 at 8:19pm
Except the radiator shroud. The B was a one row tractor and the C was a 2 row tractor, speaking of cultivating anyway. All B's had a wide front end, C's could be single,narrow, or wide front. I think you might find most C's had foot brakes and electric start because they came out later than the B. Early B's had no starter and hand brakes. The back wheels of a C had a wider stance than a B because of different length of the final drive. The drawbar on a C is a wider arch than a B to fit the wider final drives. OK what else? ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Charlie175 wrote:Posted By: CTuckerNWIL
Date Posted: 01 Mar 2012 at 8:25pm
The B test was done in 1938 with a BE engine. When the C came out, the B had a CE engine just like the C. There was also gas engine at 5.75:1 comp ratio and a distillate at 4.75:1 so there would be another difference in HP. 
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: R.W
Date Posted: 01 Mar 2012 at 8:36pm
------------- In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D |
Posted By: Protrucker
Date Posted: 01 Mar 2012 at 8:38pm
| I was comparing the B to the C with the gasoline engine. I don't know the difference between the BE & CE engines, but the data listed the same bore, stroke & compression ratios for the B & the C with gasoline engine. |
Posted By: R.W
Date Posted: 01 Mar 2012 at 8:44pm
|
Terry Dean's book says 23.30 on PTO for the C and 22.25 for the B on PTO. That is with the CE motor (1943-1957). ------------- In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D |
Posted By: CTuckerNWIL
Date Posted: 01 Mar 2012 at 8:52pm
Well the 12.97 HP was from a test in 1938 (BE 116 cuin)before the CE (125cuin) engine came out. The C test was in 1940 with a CE gas (18.4hp)engine. I guess some details get lost in too much information. The same CE on distillate had less power(15.sompin). I don't know if there were different comp ratios for the BE engine. Too many numbers to look through
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: ewbs79
Date Posted: 01 Mar 2012 at 9:44pm
|
O So essentially the b will not perform as well under the same load as the c with all the same motor because of slightly different gearing with the exact same ground speed? How does that work? I also put taller tires off of my c onto my b is this gonna hurt my ability to pull |
Posted By: R.W
Date Posted: 01 Mar 2012 at 9:47pm
|
I can't tell you about the gearing, but the taller tires will make you go faster than the stock size for your B. ------------- In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D |
Posted By: wjohn
Date Posted: 01 Mar 2012 at 9:54pm
I would love to have power numbers for the BE gas engine. You're right; I'm sure it's higher than the 12.97 drawbar horsepower that the distillate version was tested at. I always figured the higher compression gas motor was around 15 hp or so but I don't have anything to back that up. Just a guess. It should at least be between 12.97 and 18.4! ------------- 1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45 |
Posted By: ewbs79
Date Posted: 01 Mar 2012 at 10:40pm
| So let's say theoretically if I would put my shorter tires on my c it would slow me down but possibly give me more ability in pull with same pto speed? Does this sound feasible? |
Posted By: Charlie175
Date Posted: 02 Mar 2012 at 4:33am
|
if I remember right the ground speed on the C is 1/2 mph slower than a B (at least in first) Correct, the fenders are different. Makes sense that the shroud is different with the narrow front. How about the steering box? ------------- Charlie '48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD |
Posted By: Foolster
Date Posted: 03 Mar 2012 at 8:03am
| I have a B I am rebuilding. Once that is through then I have a C rear end that I am going to put a four speed truck transmission and a Yanmar three cylinder diesel ahead of. From everything I have read the B and C were same tractor except for the early Bs with the smaller engine. The CA was really different with a four speed transmission. However, I think all the major castings have the same bolt patterns so you are able to make a working tractor from parts of any of the three models. |
Posted By: Dick L
Date Posted: 03 Mar 2012 at 9:14am
| After 70 some years you will not find much difference between the (average) BE and CE engines. You have to pull the head and use a ruller to tell the difference. |
Posted By: GregLawlerMinn
Date Posted: 03 Mar 2012 at 1:17pm
|
Below is a link to a good article on the B/C/CA tractors http://www.frontiernet.net/~garosier/Little%20ACs.pdf" rel="nofollow - http://www.frontiernet.net/~garosier/Little%20ACs.pdf ------------- What this country needs is more unemployed politicians-and lawyers. Currently have: 1 D14 and a D15S2. With new owners: 2Bs,9CAs,1WD,2 D12s,5D14s,3D15S2s, 2D17SIVs,D17D,1D19D;1 Unstyled WC |
Posted By: CTuckerNWIL
Date Posted: 03 Mar 2012 at 1:34pm
|
It might have changed things some if the Snap Couple hitch had come out in 1950 as stated, but it didn't come out till 1953. Pretty good article though.
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |