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John Deere A horse power ?

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Earl

01-05-2003 16:10:26

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How much power might you be able to get out of a JD A with 0.125 over piston with a 7-3/4 crank?

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BIG IRON

01-14-2003 18:54:04

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Re: John Deere A horse power ? in reply to Earl, 01-05-2003 16:10:26

Multiply your engine displacement by .200 and you will ge pretty close. The .200 number comes from dividing a 530 JD's cubic inch's by its horsepower. 530's were the most efficient 2 cylider John Deere's. For example if you multiply a 70 gas JD's displacement (380 ci.) by .2 you will get 76 hp. If you could make a 70 gas as efficient as a 530 it would have 76 hp. Do the math then see what you come up with for real world hp numbers on the dyno. You will be suprised at how hard it is to achieve. Good luck.

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BIG IRON

01-14-2003 18:42:40

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Re: John Deere A horse power ? in reply to Earl, 01-05-2003 16:10:26

A 530 JD is the most efficiant two cylinder tractor John Deere ever made, which was .2 hp per cubic inch. This is a good bench mark to measure power by even if it is a bit depressing. I have a 70 gas with .450 over gas pistons and a stock stroke. It produces 67 hp with about 385 cubic inches. 385 divided by 67hp = .174. If I could make this tractor as efficiant as a 530 I could have 385 multiplied by .2 =77hp. This is what I'm shooting for. I would be willing to bet the big inch pullers are not at the .2 multiplier. Example 800 cubes multiplied by .2 = 160 hp. Let me know if I'm wrong. So take your cubic inches and multiply by .2 and see what you come up with for a hp number. Good luck with your A.

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BIG IRON

01-14-2003 18:37:47

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Re: John Deere A horse power ? in reply to Earl, 01-05-2003 16:10:26

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Ron

01-06-2003 06:38:16

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Re: John Deere A horse power ? in reply to Earl, 01-05-2003 16:10:26

Tommy Ivo proved that you can even make horse power with a NAILHEAD BUICK..... !!!

The secret to Horse Power is all in the Breathing...!! The lower an engine has to pull, to get enough torque to pull the load, the Poorer the breathing of that engine is....!!! A long stroke engine will make Torque, even if it Can't breath well...!! Combine good breathing with Cu. In. and you have a Winner.!! You can make the SAME amount of Torque with a Short stroke/Big Bore engine--OR Vice/Versa...the pressure is the Same at the output end..the Large bore/short stroke engine is thermally more efficient..!! ( less cylinder wall area exposed to cool the hot gases..BUT that is not the point.. JD showed in the '20, and '30 series that Big Bore/to stroke relationships were preferable to the earlier that was used with ALL-FUEL...!!!! ALL-FUEL engines had to run slow, to be efficient....!!!!

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2 cylinder

01-05-2003 18:35:44

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Re: John Deere A horse power ? in reply to Earl, 01-05-2003 16:10:26

I know this is not the answer your looking for. But just for information purposes, I tractorpull with a 47 JD-A (with the stock stroke) that has a Powerblock with .125 over high compression aluminum pistons, head (not flat style) ground to the eye browes, 3 angle valve job, with the head and manifold ported, and the oil bath replaced with a paper filter that will turn 55hp on the dyno and still run on 87 octane pump gas. Just to let you know.

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lynn

01-05-2003 17:01:40

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Re: John Deere A horse power ? in reply to Earl, 01-05-2003 16:10:26

Earl..got 60 hp out out unstyled a with .125 over and 8 inch stroke..lynn

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