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Allis Chalmers Discussion Forum
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Allis C Engine Rebuild

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Don Seymour

12-11-2007 10:06:36




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Hello,

I am in the process of rebuilding my 1942 Allis c and was wondering, do i need to be concerned with the engine possibly being a dual fuel model? How exactly could i tell if it was? if i wanted to make it an all gasoline engine, would i have to change the piston connecting rods to make up compression?

Thanks in advance.

DRS




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Dick Lemmon

12-11-2007 11:27:45




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 Sorry in reply to Don Seymour, 12-11-2007 10:06:36  
I received a phone call while I was trying to answer your questions and forgot where I was at when I could return. I see I forgot to put the word gas in the last sentence.
Old had it covered.



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Dick Lemmon

12-11-2007 11:22:49




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 Re: Allis C Engine Rebuild in reply to Don Seymour, 12-11-2007 10:06:36  
A dual fuel engine is a lower compression engine. That was or can be achieved in three different ways. The pistons were cratered, the pistons were shorter and did not come even to the top of the block. The third way was when overhauling the engines and a standard piston was being used to use two head gaskets. The manifold also needed a heating chamber that was bolted to the manifold to preheat the air entering the combustion chamber when switching from the gas to a lesser fuel.

The pistons you would buy now would be for just gas. No other differences in the engine parts for an all fuel. The all fuel ran fine on just at a slightly less horse power gas

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Dick Lemmon

12-11-2007 11:22:45




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 Re: Allis C Engine Rebuild in reply to Don Seymour, 12-11-2007 10:06:36  
A dual fuel engine is a lower compression engine. That was or can be achieved in three different ways. The pistons were cratered, the pistons were shorter and did not come even to the top of the block. The third way was when overhauling the engines and a standard piston was being used to use two head gaskets. The manifold also needed a heating chamber that was bolted to the manifold to preheat the air entering the combustion chamber when switching from the gas to a lesser fuel.

The pistons you would buy now would be for just gas. No other differences in the engine parts for an all fuel. The all fuel ran fine on just at a slightly less horse power gas

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old

12-11-2007 10:38:04




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 Re: Allis C Engine Rebuild in reply to Don Seymour, 12-11-2007 10:06:36  
The dual fuel engine runs just as well on gas as it does on the other fuels. It will not have as much HP as it would if it was just a gas engine but theres only a 1 or 2 HP difference in the 2 so you would not even nothice it



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Don Seymour

12-11-2007 10:51:37




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 Re: Allis C Engine Rebuild in reply to old, 12-11-2007 10:38:04  
Thanks you for your reply. If i wanted to get the additional HP, i would need to change the crank and connecting rods then, eh?

DRS



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old

12-11-2007 11:02:22




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 Re: Allis C Engine Rebuild in reply to Don Seymour, 12-11-2007 10:51:37  
Nope just the pistons and maybe a jet in the carb. Rods and crank are the same its the piston shape that lowers compression or raises compression



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Don Seymour

12-11-2007 11:08:02




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 Re: Allis C Engine Rebuild in reply to old, 12-11-2007 11:02:22  
thanks

so raising HP isnt to cost prohibitive then. I would like to get as much HP as possible, so i can drive my PTO generator if necessary.

Still havent gotten my hands on a new block. Suposedly, my local junkie, has one i can trade for a shop heater! We will see!!!


Thank you again for your help.



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old

12-11-2007 12:06:01




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 Re: Allis C Engine Rebuild in reply to Don Seymour, 12-11-2007 11:08:02  
A new sleeve kit for that engine costs around $525 which would include new pistons. But ya thats a lot of money to put into one. I still have 2 blocks sitting here. One is just a bare block and the other is for the most part a complete engien but needs a different sleeve in the #2 cylinder or to have the whole top of the block plained to get all the sleeve standing up at the same level

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