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Allis Chalmers Discussion Forum
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Biggest Possible Bore in a B

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Just wondering

11-19-2005 07:01:12




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What is the biggest ever seen?? Has anyone tried 3-3/4" or attempted 4" with different sleeves and machine work?




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Dick L

11-19-2005 15:57:06




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 Re: Biggest Possible Bore in a B in reply to Just wondering, 11-19-2005 07:01:12  
4 inch pistons would be out. You would have to much overlap between sleeves. 3 3/4 inch pistons is a might be maybe type of thing. You might have to run a dry block. I know you can make 3 9/16 inch pistons work. I put a set of 3 1/2 inch pistons in and found out after I bought them that the same outside diameter sleeve could be bought with 3 9/19 pistons. I have a set of 3 5/8 88 Oliver sleeves that I set on top of the little block but have not totally checked out the measurements. If those sleeves can be made to work then the 3 3/4 pistons would work. You can go as big as that in the 88 without doing anything to the block.

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Just wondering

11-19-2005 19:29:36




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 Re: Biggest Possible Bore in a B in reply to Dick L, 11-19-2005 15:57:06  
I went 3-7/8. I turned the outside of the sleeve to 4.200. The counter bores overlap. I will have to cut flats on them to clear. It didn't get into the bolt holes or water ports, but the counter bore did. I could bore the sleeves to 4", but the cylinder walls would only be .100 thick. That's getting kind of scary. I will end up with a 3.875 + .030 over for clean up for a finish bore of 3.905. That gives me 168 cubic inches, but I may stroke it 1" for 216 cubes. 4" would be possible if you moved the two center cylinders slightly closer together. This would allow for a little thicker sleeve. The only problem I see so far is that the cam lobes will have to be notched on the corners to clear my sleeves. I haven't cut the counter bores yet and only bored two of the cylinders, but I can post some pictures if you would like. The block also gets thin opposite the cam side.

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HAULLER

11-21-2005 09:59:47




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 Re: Biggest Possible Bore in a B in reply to Just wondering , 11-19-2005 19:29:36  
Curiose, what are you doing for an oil pump?
these motors seem like they need some more oil flow..... ..



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mf440

11-21-2005 07:09:36




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 Re: Biggest Possible Bore in a B in reply to Just wondering , 11-19-2005 19:29:36  
I would love to see some pictures. My brother has a strong running "C" with a stock engine, and would like more. This last year it was not very competive aginst a farmall super C that has H sleves in it. We have a few extra blocks that we can play with. Thanks for the info.



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Dick L

11-21-2005 10:45:21




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 Re: Biggest Possible Bore in a B in reply to mf440, 11-21-2005 07:09:36  
I drilled my crank to oil the rod bearings under pressure and used a D-15 oil pump for the extra volume. The bolt pattern is the same on both pumps.



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