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Allis Chalmers Discussion Forum
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WD-45 Crank in a WC?

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Farmall Daddy

03-26-2006 17:57:35




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I own a 1942 military WC, and i use it for pulling during the summer time. Our local rules have changed and now we can pull at 18'' rather than the traditional 16''. I have oversize flat top pistons in the motor and it dyno's 44 horse. I would like to stoke it out by putting the 45 crank in it. I have been told it can be done, but my main question is, when i put the crank in, what do I have to do when it comes to the cam? Do you have to put the 45 cam in with it? Also, if i needed to put the 45 cam in, could i still use my magneto, or would i have to go to a distributor? Thanks a million guys/gals!!

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slowsmoke

03-29-2006 05:37:49




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 Re: WD-45 Crank in a WC? in reply to Farmall Daddy, 03-26-2006 17:57:35  
45 crank will drop in. Cam upgrade at this time is easy. Comp. ratio with flat tops and 45crank will be around 10/1. Don't forget the extra nose weight with the higher hitch.



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Texas Denny

03-27-2006 06:28:35




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 Re: WD-45 Crank in a WC? in reply to Farmall Daddy, 03-26-2006 17:57:35  
You won't need to change the cam. It sounds like you have the 4 1/8 cylinders. If you don't change the pistons (maybe rods as well), your compression may be in the diesel range. Do you know what the compressio ratio is of the setup you now have? I'd guess the compression is higher than stock since your horsepower is more than expected by just increasing the displacement. You could measure the distance from the top of the piston at TDC and calculate the compression ratio. Then reduce this measurement by 0.25" and re-calculate the ratio. If it is under 11.5:1, you may be able to run it with 93 octance fuel.

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old

03-26-2006 19:15:46




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 Re: WD-45 Crank in a WC? in reply to Farmall Daddy, 03-26-2006 17:57:35  
Shoot why not just drop in a WD-45 engine and be done with it. The WD-45 engine will bolt right up and its a 3 hour job if you have the right tools.



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Farmall Daddy

03-27-2006 07:14:35




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 Re: WD-45 Crank in a WC? in reply to old, 03-26-2006 19:15:46  
The engine that I have in it now was just overhauled about 20 hours ago. Our pulls are going to make it harder for us little tractors to keep our power up since we are not used to pulling 18 inch. I'm not sure on the compression, but I believe it would be around 5.5:1. Plus, I would like to keep the original engine in the tractor due to it being unique in my area. I would think that not changing the cam would throw the timing totally off. My theory was that my timing would be too fast since the difference in the strokes between 4" and 4 1/2". Thanks guys!

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jd ployboy

03-27-2006 16:04:45




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 Re: WD-45 Crank in a WC? in reply to Farmall Daddy, 03-27-2006 07:14:35  
i just bought a 45 wc that the fellow said he put a wd-45 crank in it. he said it has the 4 1/8 bore in it. i think he used the same rods that are in the wc so it stroked it a half inch. he put a wd-45 carb on it and it has a d-17 governor spring. i dont know what the hp is and have not pulled it yet but any gear you put it in and shoot the gas to it, it will pick the front tire off the ground. i will pull it in 2 weeks hopefully. i also have a stock 35 wc and it won first and second place most all times and this other one has a lot more hp.

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John (C-IL)

03-27-2006 10:01:41




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 Re: WD-45 Crank in a WC? in reply to Farmall Daddy, 03-27-2006 07:14:35  
Changing the crank doesn't effect the timing unless you don't line it up right. What you do get is another 25 cubic inches of displacement, faster piston speeds and a little more torque.

I'm not sure that the main journals on a WD45 226 crank are the same as a WC 201. The journals are the same on a WD 201 and a WD45 226. You will probably need to change pistons along with the crank unless you want a really high static compression ratio.

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