John Deere G pulling tractor

17tmuthler · Jun 25, 2015

I'm new to John Deere Tractor pulling. I was wondering how much power a 1951 John Deere G would have with 090 overbore, aluminum high compression pistons, lengthed rods, head work, bigger manifold, and a duplex carb from a 730? If you don't know exactly what would a good estimate be?

blue water massey · Jun 25, 2015

the G was tested out at 34.49 hp at the draw bar per Tractor data site

factory it had a
Bore/Stroke: 6.125x7.00 inches [156 x 178 mm]
Compression: 4.2:1

best guess would be between 30% - 45% increase or 44.8 - 50 hp but that is a huge guess

as per your post you upped the bore
you lenghthened the rods and added high compression pistons that gave you a compresion ratio of
what?
re worked the head for better flow
changed the intake for better flow how about the exhaust any work there
any cam work?
and last per your post a bigger carb but how big?
any cam work or distibutor mag recurving?
there's many factors that goes into trying to guess at a hp output
best bet is get dynoed to help set things correct to get the most out of it hp wise and then you
will have a print out of the hp as well as torque
in tractor pulling torque does the work hp keeps it going

Kent Petersen · Jun 26, 2015

A stock G with high compression pistons, gas manifold will pump out 50 to 57 hp the modes you are talking could make a 100 or more depends on how well done

tim s · Jun 26, 2015

There are some G's around here doing 100 plus HP. but I'm not sure of what all has been done to them..

JLG · Jun 26, 2015

Mine had mm&w pistons, lp manifold,
reground cam, and the rods were lengthened
to make 10-1 compression. Ran on cam2 and
dialed everything in on a pto dyno. Best I
could get was 62hp at 540 pto rpm. There
was probably more to be gained with
headwork and a better cam. Look up Josh
Blackburn, he makes some good running G's. That's what I would have done if I would've kept it.

jm. · Jun 26, 2015

Problem is you can do all that but the G has to pull in the class of an 88 oliver and with and work at all and a good driver he will eat your lunch. I have watched many folks spend big bucks on the G john deers and just have a great strong tractor but never a consistent winner.

BushogPapa · Jun 26, 2015

THEN, you can go BIG..BIG Bore and LONG Stroke...

Why would you think you can only get 1/4 HP per Cu In..!!!!!!!!!!!!!!!!

John Deere G pulling tractor

17tmuthler

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blue water massey

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Kent Petersen

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tim s

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JLG

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jm.

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BushogPapa

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