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Allis Chalmers Discussion Forum
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compression wd

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ccrock

02-18-2007 19:01:35




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Does somebody know about how many pounds of compression the cylinders on a wd 45 should put out?




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baldwin

02-20-2007 13:30:51




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 Re: compression wd in reply to ccrock, 02-18-2007 19:01:35  
checked mine and got 220



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steve(ill)

02-19-2007 16:06:23




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 Re: compression wd in reply to ccrock, 02-18-2007 19:01:35  
atmospheric pressure is 14.7 psi (or about 15). if you have a 6:1 compression ratio, then you r compression would be 15 x 6 = 90 psi. if you have a high compression engine with 10:1 compression, then you have 150 psi.... approximately.



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Dick L

02-19-2007 07:06:57




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 Re: compression wd in reply to ccrock, 02-18-2007 19:01:35  
Should put out? All depends. If it is not smoking or fouling plugs with its work being puttering and all four are above 90 on every one and all close to the same your in the money. If you want to have the most horse power you can get for pulling and have not oversized it you will want to be in the 110 to 125 range. If you want to spend some money you can start shooting at 200or above. I am over 200 on my one C.

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Texas Denny

02-18-2007 20:14:27




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 Re: compression wd in reply to ccrock, 02-18-2007 19:01:35  
I couldn't find anything from AC. I checked my WD after a rebuild (and some use but not totally broke in and they were between 125 and 127 #. I had a spec on my 50 Studebaker and the spec on it was 125. I'd guess if you are over 110, the engine is pretty good. If it is below 70, it is time for a rebuild.



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