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Harry Ferguson Tractors Discussion Forum

what's the horsepower difference with the rebuild

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gshadel

03-31-2004 07:58:40

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I'm rebuilding my TO-20. I got the "power kit" rebuild set with 3 5/16 " overbore sleeves and pistons. That seemed to be the standard sleeve/piston set every place I checked.
Any idea what, if any, difference in horsepower I might expect when I'm done? There wasn't any info with the rebuild kit on that.

I guess I'm also wondering,(maybe for my next "project" tractor), if a person could rebuild a Z-120 engine with sleeves & pistons for a Z-129, with maybe a TO-30 craftshaft if I could find one cheap enough, and basically convert a a Z-120 to a Z-129 engine. Are the outside diameters of the sleeves the same for a Z-120 and Z-129? I would still be stuck with the internal oil filter, but it sounds like most of the other things are pretty similar between the two.
thanks

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Jerry/MT

03-31-2004 20:57:12

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Re: what's the horsepower difference with the rebu in reply to gshadel, 03-31-2004 07:58:40

Since the horsepower is proportional to the airflow and the airflow is proportional to the diplacement, and since you didn't re-stroke the engine, you can figure that:

Horspower(new)/horsepower(old)=Dp(new)^2/Dp(old)^2

where Dp(new)^2 is the new piston diameter squared and Dp(old)^2 is the old piston diameter squared. That'll get you close enough. Doubt that you'll have to worry about doing burnouts with the rebuilt engine!

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gshadel

04-02-2004 10:19:04

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Re: Re: what's the horsepower difference with the in reply to Jerry/MT, 03-31-2004 20:57:12

thanks for the help. I calculated my TO-20 will have ~28 HP.... if I do everything right on my rebuild.

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