John Deere G on PTO dyno

Put the 51 G on the dyno for the first time ever. She is just a plain jane .090 over aluminum pistons with a cold manifold with a 51 carb and a Delco distributor. She put out 45 HP. Pulled her in 6500 LB class with 20 tractors in the class. Took 5th and lost 4th by .01 of an inch!!!! Lost to my friends G.

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Autos & Vehicles

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• MVI
• 3805

[79fordblake]

Was this engine already broke in when it was on the dyno? I buddy of mine has a 51 G .090 over aluminum pistons with a gas manifold and it made 55hp. Only difference is he is running a straight stack and a K&N air filter.

[plowboy1943]

@79fordblake Ya, there is probably 100 hours on the engine. Every dyno is different. We put a fresh Farmall H with powercraters on it and got 28 hp on the dyno. We put a MM Z that is pretty fresh too on this dyno, 28 hp. All low readings in my opinion. But, it is just for fun. I took the straight pipe off. My 3 year old niece don't like it that loud. And she loves her uncles Deere. Thanks for watching.

[popsmurf1]

There is a LOT of iron in that block. My dad had a 52 G (56583) that was bored out .750!!! Had a head from a '38 G and a straight gas manifold. It dynoed at 65 hp. I pulled a 12' CCA field cultivator at full 8" depth in 4th gear; a 10' fertilizer spreader, a 10' disk, and a 10' drag all at once in 3rd gear; and a 5 knife anhydrous applicator at 12" depth in 4th gear. To quote an article from Two Cylinder magazine: "Compared to the A, the G was a bully!"

[jd1950r]

dont worry about taking off that straight pipe. the muffler makes 20% more hp on a dyno than the straight pipe on my stock B, 48, we even tried different length pipes & tuned on it awhile. oval muffler for a 530 makes factory rated 28hp on the pulley & best we got with straight pipe was 23. same day back to back.

[79fordblake]

@plowboy1943, yeah I hear that, I love these old deeres. My buddy uses his G for pulling only. It will pull the 7500 pound class in 2nd gear. I got three A John Deeres,