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Tractor Pulling Discussion Forum

JD G - how much power will I have?

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JL

08-31-2003 17:14:10




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I'm boring .090 with M&W alluminum pistons and LP manifold. How much horsepower should I have now?

Any other little things can I do to boost horsepower? Would Roberts Super 51 carb help or hurt me with this set up? I pull in stock classes so I can't put on a flathead or stroke it. I'm not looking to go too radical, just need some ideas to maximize what I have. Thanks for any response.




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rick

09-02-2003 17:50:36




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 Re: JD G - how much power will I have? in reply to JL, 08-31-2003 17:14:10  
first i would bore to at least 125 put in high dome pistons and a cam



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JDGnut

09-02-2003 09:19:48




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 Re: JD G - how much power will I have? in reply to JL, 08-31-2003 17:14:10  
Like Everyone else.. you should be in the mid 50's.. (maybe a little higher) Like others have said... depends on the rules.. Like Chad has been explaining about increasing the compression on the farmalls.. the same can be done in the JD's.. Lots of "stock" tractors out there with custom pistons and other tricks to increase the compression for more HP.. (As the rules usually state.. No Stroking in these classes.) Below someone mentioned about milling.. and Milling on the back side of the block.. (A nice trick if U find the right machine shop.. or do it your self.) I have seen the blocks milled down to the cut outs for the plugs on the front side.. (not the plug holes.) Try removing the gasket between the block and crankcase (its not very thick to start with.. but) or a thinner head gasket... Every little bit will help... I'm not sure on the carb.. don't know if it will help a stock cubed tractor... Good Luck
JDGnut

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JDGnut

09-02-2003 09:18:40




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 Re: JD G - how much power will I have? in reply to JL, 08-31-2003 17:14:10  
Like Everyone else.. you should be in the mid 50's.. (maybe a little higher) Like others have said... depends on the rules.. Like Chad has been explaining about increasing the compression on the farmalls.. the same can be done in the JD's.. Lots of "stock" tractors out there with custom pistons and other tricks to increase the compression for more HP.. (As the rules usually state.. No Stroking in these classes.) Below someone mentioned about milling.. and Milling on the back side of the block.. (A nice trick if U find the right machine shop.. or do it your self.) I have seen the blocks milled down to the cut outs for the plugs.. (not the plug holes.) Try removing the gasket between the block and crankcase (its not very thick to start with.. but) or a thinner head gasket... Every little bit will help... I'm not sure on the carb.. don't know if it will help a stock cubed tractor... Good Luck
JDGnut

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ChadS

08-31-2003 17:22:09




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 Re: JD G - how much power will I have? in reply to JL, 08-31-2003 17:14:10  
depending on the compression pressure, it should be right around 57-62 hp, just a guess. If you have access to a dyno, you could see a 4-9hp increase by fine tunning the carb and distributor. Use a good, premium fuel, if you are able to get an ethanol based fuel, the better it will run. If you have a COOP with a fuel station you could find ethanol. Just my opinion, Chads



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weedbender 60

08-31-2003 17:50:46




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 Re: Re: JD G - how much power will I have? in reply to ChadS, 08-31-2003 17:22:09  
What kind of stock class are you in??? Most pure stock classes are 10% over stock H.P. and 10% over stock RPM. This keeps the pull even and fair. Be careful if your going to spend that much $$ and time on your G ya might get bumped up to the next class. Another thing a few pure stock pulls do is dyno 1st place in every weight class to see if it is really a stock tractor or not. Don't mean to sound like a cry baby just my .02 worth. Just check with the rules before hand.

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JL

08-31-2003 18:32:05




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 Re: Re: Re: JD G - how much power will I have? in reply to weedbender 60, 08-31-2003 17:50:46  
There are several pulls in my area but only a few are sponsered by a pulling club that has a detailed set of rules defining stock. Mostly the stock pulls say no major modification such as a powerblock or turbo. No stroking and no more than .125 overbore. But it's just like any other motorsport, people push the grey areas. There is one pull I go to that has the 10% over rule, but that seems to be pretty lax. I saw one G pulling with the block and head milled down to where the water pipe and manifold were nearly touching, and this was in the "stock" class.

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ChadS

08-31-2003 18:27:14




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 Re: Re: Re: JD G - how much power will I have? in reply to weedbender 60, 08-31-2003 17:50:46  
Well, a bone stock tractor, with no mods, may pull well. But, if you take the same tractor,and fine tune it, carb work, setting the timing correctly, and give more fuel, it may out pull the stock tractor. Its not changing bore and stroke, just making the engine run better to its full potential, with carb work, the right "legal" fuel, and the proper timing setting, you will notice a big change in the way it runs down the track. I am a fan of farmstock pulling. Been pulling stock tractors for years, I go through the carb extencively, to pull a few more ponies out of it without boring or stroking. Just my opinion, ChadS

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Tyler Neff

08-31-2003 17:43:01




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 Re: Re: JD G - how much power will I have? in reply to ChadS, 08-31-2003 17:22:09  
I used this set up for a long tyme and it made about 65-70hp . Plane your head .125 do the front of the block and the back of the block.125 also.Next cut your rocker arms.Now find a good cam.Theres nothing wrong with the stock one for what your gonna do,but every little bit helps.Ihave a good cam design Ive been useing, it doesnt do much for horse power but it will hold your RPMs for a long tyme.(lugs real good).If u have any questions E Mail me

Thanx TY

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