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Allis Chalmers Discussion Forum
:

Miss Information From Somewhere

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Dick L

01-17-2010 09:28:41




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Not to pick on anyone Don't know where you found the higher compression information but it is not so. The later B's, C's, and CA's were all 125 cubic inch displacment. They were all 3 3/8" diameter pistons. They all had a 3 1/2" stroke. The heads all had sand cast firing chambers with close to the same depth. In rebuilding all three models heads they were all very close to the same depth at the top of the valve. You can find some difference in the firing chamber depth at the deeper and shallower sides of the firing chambers. However you can find the shallower firing chambers on the earlier B's. Sand cast parts are not held to plus or minus .001

Not wanting to rely other peoples myths and rumors I cut up parts to see what I am actually dealing with.

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Brian Jasper co. Ia

01-17-2010 14:48:38




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 Re: Miss Information From Somewhere in reply to Dick L, 01-17-2010 09:28:41  
Dick, the compression ratio info is on page 81 of Norm Swinfords book. It jumped from 5.75-1 in the C to 6.25-1 in the CA.



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BDT in Minnesota

01-18-2010 05:27:01




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 Re: Miss Information From Somewhere in reply to Brian Jasper co. Ia, 01-17-2010 14:48:38  
for clarification, here are a few part numbers from a CA dealers parts catalog (issue date August 1960:

Piston Assembly, 5.7:1 ratio, gasoline, used prior to Engine serial number CE 153962.

Piston Assembly, 6.25:1 ratio, gasoline, used on engine CE 153962 and up.

Piston Assembly, 5.2:1 ratio, low octane fuel.

Piston Assembly, 4.7:1 ratio, low octane fuel.

Now, the ONE cylinder sleeve that is listed is #208743.. So,all of these part numbers are for the standard 3 3/8" cylinder bore.... All four of the pistons listed are 3 3/8" diameter...




A ratio of 5.75:1 is also listed in the I&T shop Manual # AC-11...????????????????

Ok, these engines were produced in various horsepower ratings, as well different fuel types: Distillate, gasoline,


And yikes, I haven"t mentioned the various aftermarket overbore kits that have been around for decades.....
This post was edited by BDT in Minnesota at 05:47:44 01/18/10.

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