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Super M Horsepower?

D

DHad

New User
Saw an ad for a 1952 Super M and the ad claims 65hp???? Is that possible? I have run Super H's and Reg. M's but they had no where near that kind of HP.
 

It's possible, yes, but I would not count on it. Often people will make claims about their tractor out of ignorance, or they may simply be lying. "Just needs paint" is one of the more often used claims, but is rarely true.
 


The factory NE test # from the book is 44.2 hp

I run a antique tractor dyno service and 65 hp can be done.

A true 65 hp is a 50% improvement over stock rated hp, this takes some work and dyno time to achieve.

I have been pulling a 52 Super M with a 450 kit installed [281] and getting hp #S in the 70s.

It has taken a fair amount of work and money to get to this point, i think were close to the limit.

I think if the weather is perfect and everything is spot on it we will get just over 80 hp.

We don't dyno them at 540 pto either, i try to dyno them in the 450 to 500 range like it is lugging.

We also do this in the 1700 to 1800 rpm range for a stock cam. Anything over this and the cam runs out of lobe [torque #s fall off fast].
 
Stock is HP 46.3 per the Neb tractor test #476. 65 HP is possible - however it requires a LOT of engine modification/upgrade.

More likely 65 HP is a simply number the seller pulled out of his posterior. Might even be the same guy who offered a "1943 Super M" here recently. (Upon close inspection the only thing 'Super' about it was the decals on the hood.)

Buyer beware!
 
Maybe it is Engine HP - They're doing that now like your riding lawnmower 24 hp vs the H's 24. On the other hand, a neighbor had an old Farmall M with an $8000 engine with 18.4-38's he pulled in 4th gear and it would beat souped 4440's and 1066's as it finally spun out. I guess that old M was putting out 7 or 800 hp. The only thing M about it was the hood and steering wheel.
 
A 65 hp Super M would be considered "stock" on the pulling forum. It could have the 281 kit in it, with some other upgrades 65 would be achievable. I would make sure on a dyno before any extra money was paid for claimed hp.
 
I've got an old 51 m that has on my dino 63 h. new valves ,gides, 100thous off head and old 5000 foot pistions , and bigger butterfly .So it can be done ,the old farm tractors with 8000 foot firecraters would pull real good.
 
I am not vouching this will work in practice but if you can increase the redline somewhat there should be a lot of HP to be gained.

Recall the classic equation for SAE units HP = torque * rpm / 5252.

One thing that would have to be done is to decrease the intake restriction somewhat. While this provides a lot of mixture motion at low rpms in the interest of improving lugging torque, the features that enable the mixture motion cause flow restrictions as the engine runs faster.

One would likely not be doing themselves any favors in the durability department by running the engine faster though...
 
I built one awhile ago,looks absolutley stock ,makes 92 ponies on a certified dyno.Bout 3000 bucks in new/different parts tho. Hoss
 

What stroke ? My dyno is calibrated and certified threw the U.S goverment dept of weights and scales yearly.

I would really like to know how your pulling 92 hp on a standard stroke and rod .

I can pull those #s if i spin the motor up into the 2600 rpm range but the cam looses torque at 1900 rpm.

Now with a cam change which anyone can now hear it would make more but not that high.

Tell the hole story, just the facts.

I even run the 450 head and don't make those #s and this head has spent a ton of time on the flow bench.
 
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