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Thread: Turning up power on PT pump on 855

  1. #1

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    Turning up power on PT pump on 855

    We have an 835 Versatile tractor with a 855 cummins in it. Its a 1982 model rated at 230hp and 800 lb ft of torque. I would like to know how to get up to 250hp and 850 lb ft torque out of it. I think all one has to do is remove a plate from somewhere on the injection pump and drill a larger hole in it but I'm not sure of where to do this at.



    I hope someone can help



    CR Toney
    '03 2500&'05 3500-6spd 4x4 Smarty Jr ( timing 3, torque 4) 50hp injectors, ATS ex manifold, 4" exhaust w/Donaldson muffler, Centramatics Fluiddampr, intake horn, modded airbox intake muffler MIA TPP turbo blankets
    03 DT free spin, Timbrens FASS 05 GDP 2mic fuel filter Triple C Hydrabed 6.7 airbox

  2. #2

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    Diesel Injection of Pittsburg has been tweaking the 855's for years. Go here for lots of info:

    http://www.dieselinjection.net/frames.html



    Click on "Bruce's Horspower and Torque Articles".
    95 2500 4X4,#5 plate,3K, PDR HX35/14, 215's, BHAF, 4" Jardine, Jacobs in-line, mystery switch, Goerend triple, 222K.

  3. #3

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    If it is turbocharged and has the aneroid head on the back of the PT pump, all you have to do is put a bigger button and spring in the pump from a 250, 290, 335, 350, 400 etc. However, there are better and safer ways of turning the PT up ,however, it takes some calibration from the stand. A good tech on a calibration stand can make a PT pump engine really run awesome and still stay within the factory tolerances. The spring and button is a cheap easy way but can get a little toasty if you dont watch your foot.

  4. #4

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    Get a pyrometer, whatever you do. Don't get any bogger implements, just pull it faster. Clutch may not be happy about it.



    Don't recommend it, but you could just put a pair of Vice-Grips on the return fuel line. lol It will increase the fuel pressure. The PT stands for pressure/time. More pressure means more fuel and thus more power. Get a fuel pressure gauge.

  5. #5

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    Make sure it has a turbo. In the automotive market, most 250 hp and less 855's were N/A. Not sure about tractors





    "NICK"
    74F350 4x2w/90ctd, 5spd Clark w/3spd Spicer-aux, aftercooler w/#16 hsg, 8.5cfm Holset air comp, air horns, seats, Pacbrake, overloads, maxi brake, 5"stacks, aluminum bed. 01 quad cab 4x4, 6spdw/3.55, 275s, edge juice w/attitude, 4" MBRP, BD brake. 91.5 D250, 5spd, 50 hp inj. #16, pac brake.

  6. #6

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    230hp 855

    The engine is rated at 230hp at 2100rpm and 800ft lbs at 1400 rpm the other models are 250/850 280/950 the only difference I could find was rad size on the 280 hp and one extra fan blade on the 250 hp. The injector cups had a different part # for higher flow. I thought if I could do a slight adjustment I could up the power at a slightly lower rpm. We have an C series in a tractor that is rated the same but mated to a powershift doesn't pull near as well 2mph slower with same load.



    CR Toney
    '03 2500&'05 3500-6spd 4x4 Smarty Jr ( timing 3, torque 4) 50hp injectors, ATS ex manifold, 4" exhaust w/Donaldson muffler, Centramatics Fluiddampr, intake horn, modded airbox intake muffler MIA TPP turbo blankets
    03 DT free spin, Timbrens FASS 05 GDP 2mic fuel filter Triple C Hydrabed 6.7 airbox

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