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Allis Chalmers Discussion Forum

Allis model b

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12-24-2017 06:30:40

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Just purchased an Allis Chalmers model b. Joined a local club. Went to my first show and pulled a 146%. Not sure how good that is for a stock 1949 CE low octane. Does anyone have any tips on improving that. Iíd rather not dig to deep into the motor. How about I little head work? How to improve intake and exhaust using todayís fuel. How about tire pressure on a 2200lbs tractor on 9.5-24 Sat II 23 tires? Also, for the life of me I can not find the Fire, Center marks on the flywheel! Iíve had someone turning it over by hand slowly, looking in the hole with a flashlight and my readers on, and canít see it. Not a dot, hashmark any sort of marking. I have installed 12v starting system. Other than that itís stock.

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Dick L

12-30-2017 11:31:24

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 Re: Allis model b in reply to plowboy1972, 12-24-2017 06:30:40  
They make a stiff wire brush that will work in a electric drill what will go into the inspection hole. I would guess you will find it when cleaned to where the flywheel looks like new steel on the edge.

I started pulling with an Allis Chalmers stock C. Same engine as your B. I was told I could get more HP with a stronger spring. What I found when pulling on a transfer sled as soon as the tractor took on a load the rpm dropped way before the traction give out and it might have gained an inch or two if any. I went to a cot spring, which is almost like using a piece of bailing wire direct to the carburetor, that would take the RPM to its fuel limit. this was not much faster that the heavy Allis spring. I drilled out the power jet a slight bit until I had the RPM as fast as I thought I could get by with. Same results as before. Without more engine it was not going to gain me much if any more distance on the track. Over the next winter I removed the head and milled .150 off that head. When I started pulling again the engine would support the extra RPM and I could see some extra gain in distance. The next year I installed small block Chevy valves and reamed out the ports to 1 1/4". This also gave me more wins than before. Because of competition from a cousin all reason went out the window. This is when I went to a 4 inch stroke, a crane ground camshaft with larger valves and all the restrictions removed from the below the valve seats. The original carburetor received a larger power orifice and venturi. I built a pulling track at the edge of my yard in a field to try all changes I made in the carburetor along with what the different balance an air pressures did.

The first head hand reamed first then milled.
third party image
third party image

This not the head I run but the same work was done.
third party image
third party image

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12-24-2017 18:58:51

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 Re: Allis model b in reply to plowboy1972, 12-24-2017 06:30:40  
If your engine is new enough, just use a D-15 governor spring. That will yield 2,200 RPM when adjusted right.

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12-24-2017 12:50:13

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 Re: Allis model b in reply to plowboy1972, 12-24-2017 06:30:40  
To increase the HP of an engine, you raise the compression, increase the bore/stroke, increase the RPM's or install a larger carburetor. Doing any cylinder head porting will be an absolute waste of time on an engine like that. Increasing compression or bore/stroke is beyond what you are willing to do. A larger carb and more RPM's will get you more HP. Get one off of a D15 or D-15 S2 and make it fit the engine.

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12-24-2017 18:43:40

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 Re: Allis model b in reply to DrAllis, 12-24-2017 12:50:13  
Thanks for the reply. I understand going with a bigger carb. How can I raise the rpms. Governor upgrades our mods?


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