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Tractor Pulling Discussion Forum

John Deere A Power

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A-Man

05-31-2005 15:43:51




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I have a "47 A 6.125x6.75, msd ignition, jerrys head and manifold. Any ideas on how much horsepower (ballpark) this tractor might have.




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buickanddeere

06-02-2005 14:42:42




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 Re: John Deere A Power in reply to A-Man, 05-31-2005 15:43:51  
About the same HP as a factory stock 620/630. It doesn't take very much money to strip every bit of weight off 620 down to an A's weight. And use an aluminium rad, light weight floor,seat and use an electric drive on the fan/water pump. The 620 can be woke up for about another 10HP of snort with just LP pistons, LP manifold, a cam plus a good port cleanup/blending.



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o,kspuller

05-31-2005 19:44:28




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 Re: John Deere A Power in reply to A-Man, 05-31-2005 15:43:51  
that engine has a 630 cam , with a g carb bye roberts,



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a puller

05-31-2005 19:31:30




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 Re: John Deere A Power in reply to A-Man, 05-31-2005 15:43:51  
55-60 hp.....



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Drew

05-31-2005 16:04:45




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 Re: John Deere A Power in reply to A-Man, 05-31-2005 15:43:51  
I would guess around 65 to maybe 70, depending on your carburetor, camshaft, compression and RPM you are trying to run it at. The Jerry's induction system is too big for a small engine and low end torque suffers.



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jdhauler

05-31-2005 20:53:14




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 Re: John Deere A Power in reply to Drew, 05-31-2005 16:04:45  
no more than 55 hp tops, just cant without alot of rrr's or stroke.



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adude

06-01-2005 18:58:25




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 Re: John Deere A Power in reply to jdhauler, 05-31-2005 20:53:14  
know of a JD A with a cam, powerblock/G pistons, and a G carb with a port/polish job, 3 angle grind with 53hp



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