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Bored-Out Two Cylinder.....Problems?

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Tye

03-22-2002 05:29:12




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I understand that you can bore out a two cylinder tractor to increase horsepower. Does anything have to be done to modify the clutch and PTO to handle the increase in horse power? What kind of modification do you have to do to the carb? Ok I have one more question. How much horse power could I increase on a 50 if I did bore it out one day? Thank you for all your time and I appreciate any responses.

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Toivo

03-22-2002 07:23:26




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 Re: Bored-Out Two Cylinder.....Problems? in reply to Tye, 03-22-2002 05:29:12  
Simply boring the 50out by 1/8" or .0125" won't increase cubic inch displacment enough to significantly increase horsepower. Raising the compression will help power. The drive train, and cluch, and PTO is built well enough to handle what you will be able to increase the power. The stock carburetion will work fine on a high compression 50.



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G Taylor

03-22-2002 08:59:14




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 Re: Re: Bored-Out Two Cylinder.....Problems? in reply to Toivo, 03-22-2002 07:23:26  
Boring a JD50 out to 125 thou will increase the displacement from 190 cu in to 200.089 cu in. If the same HP per cubic inch was made the new output would be 32.43 HP or only 1.66HP more. Of course the carb/head/exhaust will be slightly less efficient trying to supply the higher flow so HP per cubic in will be slightly less. Also more combustion heat will be soaked through the thinner cylinder walls to the coolant instead of staying in the combustion chamber to make pressure/torque.

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Ron

03-22-2002 18:33:11




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 Re: Re: Re: Bored-Out Two Cylinder.....Problems? in reply to G Taylor , 03-22-2002 08:59:14  
With an increase in compression-say.. 7 to 1, and a +.125 you will perceive a very good increase in power... Some say 6.5 to 1 +.125" will give 7 to 1 .... It will do about anything a late "A" will do..... It will be real "Stuborn"...damn near refuse to pull down, on a 6' bush Hog...probably in 4th gear, too.



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