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Allis Chalmers Discussion Forum
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WC Compression

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Texas Denny

02-11-2006 18:37:21




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I am currently rebuilding a 1947 WC. The cylinders and pistons were near perfect however the rings were worn out. Bearings were also in spec. Just before I put the head on, I noted that the height of the pistons seemed much higher than I'd seen in the past on WD tractors (rebuilt several - this is my first WC). I measured the distance from the top of the piston to the top of the block and got 0.625. I went back to the manuals and checked the compression ration and calculated that the distance should be 0.889. Calculating the compression of these pistons, the compression ratio will be close to 7.4:1 whereas both the WD and WC should be 5.5:1. Does anyone have an idea what these pistons might be? The crank is 4.0 stroke so it is a WC/WD crank.

Thanks for your thoughts.

As a further aside, according to Professor Rogowski's book "Elements of Internal Combustion Engines", this compression ration should improve the efficiency of the engine from approximately 29% to 33%. And theoretically, horsepower should increase by about 13% from 29.93 to 33.34. I doubt that I'll ever be able to detect that!

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Michael D.

02-11-2006 22:04:12




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 Re: WC Compression in reply to Texas Denny, 02-11-2006 18:37:21  
Is it possable that Allis Chalmers built a high altitude engine kit or a propane kit? In either case the engine would need higher compression to be efficent. The regular stock engine would run just fine but wouldnt be as efficent.



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Texas Denny

02-12-2006 06:10:42




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 Re: WC Compression in reply to Michael D., 02-11-2006 22:04:12  
According to my IT manual, they only had one piston for the WC though it may have come in both cast iron and aluminum. The WD had three pistons for gasoline that had three compression ratios of 5.75, 5.5 and 6.6. The WD had 2 ratios for tractor fuel. They were 5.0, and 4.5. None of these would get to the 7.4 that I measured. The WD-45 had a gasoline of 6.45, two tractor fuels of 5.25 and 4.75 plus the LP with 7.2. However, if any WD-45 piston were used with a WD crank, the compression ratio would be much less. These must be after market. They did not have M & W on them so they would be another company.

Wish that I had studied them more before I put them in. I figured them to be standard because they were the 4 inch bore.

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gene (missouri)

02-12-2006 07:53:44




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 Re: WC Compression in reply to Texas Denny, 02-12-2006 06:10:42  
The WC parts manual lists nine different piston assemblies for the WC. Compression ratios: 4.2, 5.0, 5.5, 4.5, 5.0. 5.5, 5.7, 6.6, 5.02.

Gene



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Texas Denny

02-12-2006 09:21:02




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 Re: WC Compression in reply to gene (missouri), 02-12-2006 07:53:44  
Wow! Never would have guessed they'd have that many. But none are over 7.



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