F12 repower-F12 flbs torque?

I have two F12 tractors. One is 100% original and the other is in pieces, bu tsupposedly complete. I tried finding the F12 torque ft lbs-rpms on the Internet with no success.

I wanted to repower the parts tractor with a Pontiac 2.5 Iron duke engine. It has roughly 123 ftlbs of torque at 2400 rpms. I have a small transmission to use to drop the out put rpms roughly to the F12 rpms.

Does anyone have the F12 torque ft lbs at the proper F12 rpm?

Thanks...

Don't have torque but some other specs of F-12 from Nebraska Test# 212; DBHP 11.81, Belt HP 14.59, Max rpm 1400, governed rpm 900-1400, max pounds pulled 1870, aprox shipping weight 2800 lbs, weight as tested 3280 lbs, list price $595.

Harold H

Look at antique pullers forum/s to see what others are cranking into the F-12 chassis, you might be suprised! Jim

The F-12 engine produced about 74 ftlbs at about 1,000 rpm, with very little drop off for 200 rpm on either side.

(quoted from post at 19:58:11 10/18/10) I have two F12 tractors. One is 100% original and the other is in pieces, bu tsupposedly complete. I tried finding the F12 torque ft lbs-rpms on the Internet with no success.

I wanted to repower the parts tractor with a Pontiac 2.5 Iron duke engine. It has roughly 123 ftlbs of torque at 2400 rpms. I have a small transmission to use to drop the out put rpms roughly to the F12 rpms.

Does anyone have the F12 torque ft lbs at the proper F12 rpm?

Thanks...

Click to expand...

The best way to approximate the power and torque of an F-12 is to get a bicycle and a rope. Hook the rope to something heavy and then get on the bicycle , grab the rope and try to pull the heavy object. This will be a close facsimile of the F-12's performance.

That"s it. Sounds about what I thought it would be. I know the Iron Duke 2.5 would be quite a bit more power, but I don"t think I will be excessively overpowering it. I am NOT trying to make a pulling tractor, though.

Hang yourself with that rope!

Can you pull 3820 pounds with your bicycle? That is what the F-12 pulled in its Nebraska test.

Harold H

I think you are exaggerating a figurative reference to the F 12 being puny in reference to modern day tractors...maybe...but

My dad purchased this tractor from a neighbor in 1966 when I was 3 yrs old. I grew up with it. We pulled a Case sq baler that had a Wisconin engine on it, used the IH sickle mower on it, pulled a team hay rake with a short tongue, pulled a team manure spreader with a short tongue, ran a 20" one sided planer, ran a hammer mill (I recall it being a bit under powered for that), pulled out firewood and cedar logs, cut hardwood on a buzz saw ... just to mention a few things. We used this tractor alot for 44 years without much trouble out of it. I do remember a few engine overhauls, etc.

I like it so well I wanted to put another one together, but I need a few expensive engine parts so I"m opting for a repower with a Pontiac 4 cylinder. A neighbor had one with a flat head dodge 226 (6 cylinder). If you got it on a hard pull it would spin the tires and dig holes. This was with the rear steel wheels. Thats why I asked a reasonable question about the torque ft lbs/rpms.

WayneT. Let me give you the best advice you will ever get on these forums. WHENEVER you see a post by Tom43 simply do not read it. He has a filthy reputation on pretty much every forum he feels a need to lurk on. His history is a long one and easily researched.

I figured that out the minute I read "Bicycle".

The gear train will cover a lot more HP than was built with the original engine. Do you plan on pulling when finished.

ROFL! He likes to ridicule people. Seems to feel empowered by it somehow. A very sad individual indeed. His attack on a historically significant machine like the F-12, which along with it's F series sisters were the predecessors of tractors which opened up agriculture in this country and made us into the world power we once were is typical.

Don't have Nebraska tests in front of me, but I believe the gas-powered F-12 put out a bit more than shown in the entry here. An F-12 was my "first tractor," which I started steering before I could reach the clutch, shortly after my father bought the tractor new in 1938. In a few months, I could scrunch down enough in the seat to start and stop the thing.
I see mostly praise for the tractor in the comments here. This was an absolutely great tractor for its day. Not the most comfortable, but not bad. The engine was one of the earlier designs for using increased engine speed to get power, rather than dropping in a humongous engine that ran at low speeds. I give partial credit to full-pressure lubrication for the engineers' willingness to go to higher speeds (I have a little Ford 1100 that will turn up 3000, and it is as reliable as they come!!). The Farmall H goes the same route (aside: a dealer told my father in the early 1940s that the H would tear itself apart because it ran so fast! We had two, and they were as reliable as any tractor made). The tradeoff is not much torque, but tractors designed this way use gearing to get the needed torque to pull their "rated" loads.
In the approximately 25 years that my father
used this F-12, I don't think any repairs were made other than the replacement of a couple of fuel pump diaphragms. In its earlier years, we
used it for all kinds of heavy work because it was so much more comfortable than the steel-wheeled 10-20 that was still on the farm. I never saw any sign of structural weakness in the engine, gearbox, frame, axles, etc. And, for all that some might say about the lack of power, we need to take into account the difference between steel wheels and rubber. Our F-12 on rubber pulled almost the same load that we used to put behind the 10-20--a double 12" plow or a 7-ft. double-disk harrow (the 10-20 pulled 2-14s; never tried that behind the F-12, but I suspect it would have done OK in moist soil in second gear). The F-12 governor was "snappy"--within the load range of the tractor, the governor was very responsive.
I used to cuss at the slowness of the tractor, but it was slow because it was designed in the early 30s for steel wheels. Hauling a hay wagon for a mile to the barn was a pretty leisurely process. The 7-mph 3rd gear would have made this a nice hauling tractor on the rough country roads of the forties.

Well, it looks like a f12 can handle about 300 horsepower,
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