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Allis Chalmers Discussion Forum

WC horsepower

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Author  [Modern View]

07-04-2008 19:58:34

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I have a 1945 WC that we have rebuilt with .125 over pistons, they are flat tops, we also rebuilt the carb and mag. Did I gain any power?? If so, give me a rough estimate. thanks guys

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Texas Denny

07-05-2008 06:36:14

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 Re: WC horsepower in reply to 630rich, 07-04-2008 19:58:34  
630rich, I've read all of the posts here and it looks like I am going to disagree with a lot of people. My opinions on this one will be based on some facts and some experience.

Fact #1: The displacement of a WC engine with 4.125 cylinders is increased from 201 to 214. That is more than half way to the WD-45 displacement of 226. If they maintained the compression ration of the original piston, it would suggest a 7% increase in horsepower - from about 28 to 30. Fact #2: Every 4 1/8 piston I've ever seen is a flat top which will provide a significant increase in compression ration. Theoretically, when compression ratio is increased, the power output increases by the same ratio. Since we don't know the after compression ratio, it is a guess as to how much horsepower will increase from the compression ratio change. Fact #4, M&W was one of (or maybe only) piston and sleeve maker in the 50's that pushed the larger cylinder. They advertised a 7 horsepower increase for the WD and the only difference that I am aware of between the WD motor and the WC motor was RPM. The difference between a WD and a WD-45 is about 8.3 HP. So the M&W cylinders almost get to the WD-45 horsepower. Since you've made an adjustment to rpm, you may have reached the rpm of the WD - RPM being the major engine difference between the WC and WD.

With all of the above facts, it seems quite likely that your horsepower has improved significantly. The starting hp was 29.93 on the belt. Changing displacement, rpm and compression, may have boosted you from 6 to 10 horsepower - put hp higher than the WD but perhaps a bit less than the WD-45.

When I was in high school, my family farmed with two 1939 WC tractors. I lived in southern Minnesota in black soil country. We pulled 2-16 plows in second gear accept in alfalfa when we sometimes had to go in first on old hay fields. We pulled a 10 foot tandem disk. When we had one of the WC's rebuilt with 4 1/8 cylinders, that tractor could pull the 2-16 plow in third gear (didn't do it except for test because it threw the dirt too far). The rebuilt tractor could pull the 10 foot disk in third gear easily - no strain in 3rd with either the disk or plow. Since the advertised speeds for 2nd and 3rd are 3.5 and 4.75 mph, that WC had an increased hp of 35% or about 10 hp. Remember, we had it rebuilt because it was tired so it probably didn't have 29 hp to start. We also bought a WD with 4 1/8 cylinders. That WC could keep up with the WD on all tasks - couldn't observe a difference. Later on, we rebuilt the other WC with exactly the same results.

Now for opinion. The original WC hp is listed as 29.33. Based on what you have said, I'd guess your hp to be between 37 and 40. You did all these - displacement, compression and rpm. Increase any of these and hp theoretically will increase proportionately. Increase them all, and the effect is additive.

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07-05-2008 16:14:54

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 Re: WC horsepower in reply to Texas Denny, 07-05-2008 06:36:14  
texas denny sounds like you agreed with me .

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07-05-2008 09:59:09

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 Re: WC horsepower in reply to Texas Denny, 07-05-2008 06:36:14  
thanks everyone, really helpful...gotta find a dyno!

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07-05-2008 06:27:41

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 Re: WC horsepower in reply to 630rich, 07-04-2008 19:58:34  
The old M&W kits promised around 7-10 for wc, wd if i remember.

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Jeff Z.

07-04-2008 20:08:48

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 Re: WC horsepower in reply to 630rich, 07-04-2008 19:58:34  
The hp gain is probably so insignificant you won't even notice it.

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07-04-2008 20:17:14

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 Re: WC horsepower in reply to Jeff Z., 07-04-2008 20:08:48  
We also had the head done also, and worked the rpms a bit.

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07-04-2008 20:50:27

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 Re: WC horsepower in reply to 630rich, 07-04-2008 20:17:14  
yeap you increased the horespower probably by 5 to seven percent. increasing the bore size should have raised the compression maybe a half a point also .

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07-04-2008 20:55:28

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 Re: WC horsepower in reply to mlpankey, 07-04-2008 20:50:27  
raising the rpms will give signifigant gains if you raised say to d17 or 170 rpms. even though those tractors had the 226 instead of the 201 .the 201 still benefeits from the increase.

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07-04-2008 20:45:49

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 Re: WC horsepower in reply to 630rich, 07-04-2008 20:17:14  
You may have gained a HP or 2 but thats probably about it. 1-5HP increase you will not notice much if any

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