Allis B horsepower

Lars52

Member
When looking at the Nebraska test data for the Allis B, the 1938 test lists the drawbar horsepower as about 13 hp while the 1950 test lists it as 19.5 hp. Does anyone know when the increased horsepower B was marketed? If I want to purchase a B with the greater horsepower, what years of manufacture do I need to look for? Or were there several smaller increases in horsepower over time during the years that the B was manufactured? Thanks
 
The Allis Chalmers B prior to 1943 was a 116.1 cubic inch engine and turned 1400 RPM. The 1943 and up was125.2 cubic inches and turned 1500 RPM.
 
I don't know how important staying original is for you but my Dad put a 149 cubic inch engine into his 1950 model B. It took a few modifications but the power difference is impressive. The power is the same as a D14 and early D15. It made the the tractor a whole lot more fun. He has made a very nice snow plowing set up with side wing and all. He has put on 13.6 x 24 rear tires also. He plows snow in high gear up some pretty steep hills and still has plenty of power.
 
The difference in the stats is the piston diameter and governor spring only. They went from 3 1/4" pistons to 3 3/8" piston. The stronger governor spring added rpm's for added hp. The over bore kit now for all those engines is 3 7/16". After 77 years it is hard to tell what is in the engine for pistons when looking at the outside. The only difference in the blocks is the bosses added up front left side for the generator mount. No differences in the heads.
 
Many of the 116 cu in engines have been upgraded through the years with new sleeves and pistons to get the higher HP. Yours may be one of those.
 

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