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Tractor Pulling Discussion Forum

JOHN DEERE GUYS NEED HELP

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freind of a own

03-08-2005 10:52:25




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A friend has an A currently 185 comp and around 50 hp.How much hp can be gained just by swapping in a powetr block?Also what is the point of dimin ishing returns on stroking?Nine inch?8.75?Thanks.




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Ironsled

03-08-2005 17:00:35




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 Re: JOHN DEERE GUYS NEED HELP in reply to freind of a owner, 03-08-2005 10:52:25  
I'm not sure if there is diminishing return on stroke. The more you stroke the more power you will gain. 9 or 9.25" stroke is pretty common. More than that and you get into serious work like moving the cam. What does your friend have done to his tractor right now as far as bore? A lot depends on what is done, but just a powerblock swap would give you 5-7 horsepower maybe? I've never personally used powerblocks so I'm not the best source.

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a puller

03-08-2005 18:10:35




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 Re: JOHN DEERE GUYS NEED HELP in reply to Ironsled, 03-08-2005 17:00:35  
a powerblock if done right gains usually a max of 10 horse..ususally its ike 3-7hp though....



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49 A

03-09-2005 23:20:12




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 Re: JOHN DEERE GUYS NEED HELP in reply to a puller, 03-08-2005 18:10:35  
While dynos can vary quite a bit from one to another, getting 50 ponies out of an A with stock crank and block isn't bad at all. Given the 180psi, I'd imagine that the tractor already has been bored w/aluminum high comp. pistons, and possibly some head milling or a heisler. If this is the case, going to a stock power block and pistons will likely give it some more torque due to the increased cubes, while the power increase won't be spectacular.
With a stock crank, assuming that you're running a heisler with a cold intake, decent carb & ignition, regrond cam, and .125 over high compression power block pistons, 65-70hp is about the max. Hope this helps.

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