Dyno Farmall M

grizz665 · Aug 14, 2016

Dyno 1951 Farmall M with a replacement block with cover plate below carb. burns oil, smokes pretty bad compression 100 ,110, 130,120 It made 50 hp would like to rebuild engine . What hp would we be looking at after rebuild?

rankrank1 · Aug 14, 2016

I would say your plain M already is at a Super M or beyond type of engine kit in it.

Plain M were only about 36 PTO hp originally.

Super M start getting in the 48 hp range. (M&W, IH firecraters, kits, 450 kits etc would all be in the ballpark area around there to slightly more).

With those type of compression numbers, I would be tempted to simpy re-ring it and break the glazewitha light cylinder hone if diagnostic tests showed the oil consumption was ring related and hope for the best.

DeltaRed · Aug 14, 2016

You are aready at the top of a 'stock' M.You want more ponies? Dig out your wallet,open your bank account. Oh sure you can get 100+ horse out of an M,but that costs BIG bucks,and pretty much 'wrecks' it for every day use.Or Get a KeyStone turbo kit. Under $2000.00

DeltaRed · Aug 14, 2016

My Super M rebuilt in '82 with 450(stephead) pistons/sleeves(4 1/8") is 'only' at 60 +/- hp (measured).Thats with fuel opened a
bit and RPM 'tweeked' a bit.Nothing else special. at over 5000 ft altitude.

grizz665 · Aug 14, 2016

It has 8060 head with z casting on head that would make the head 1954. Has firecrater pistons don't know what the bore is until I pull the head off.

Highwayman · Aug 14, 2016

Got a 48 with 4" firecraters. Will make 57 on the dyno. The old timer had 2-3 Ms around and always said that this was the best one. There were a lot of variables to them over the years heads,pistons, bore etc...... I have 3 an M , SM and SMTA SM was the strongest at 62 but it has 4.125 M&W pistons the M and SMTA are about the same. Don't know what's in the MTA's never had it apart but I suspect it probably has 4" firecraters or equivalent

D beatty · Aug 14, 2016

With the help of my IH dealer I did a 51 M with the 264 block in it and put the over size IH fire crater 281 kit in it. Dealer took the carburetor and distributor and put the kits in them that came with overhaul kit. They give you a template to make a new 22 degree mark on damper pulley to advance timing. We also upped the RPM by about 250 RPM. After we give it a little break in time they put her on a dynamometer and it put out a little over 70 HP. We also used an LP gas manifold.

D Slater · Aug 14, 2016

IH tested a SM 4.125 fire crater package in 1964 with results of 52.5 to 53.5 PTO HP. SM gas manifold used, standard elevation pistons, SM gas head and total timing advance set at 22 degrees and standard RPM. Says the current camshaft used in a C-281 will give 1 to 1.5 more HP if used and the current 450 gas manifold will give a little more HP.
M&W advertised a M standard altitude M&W piston gasoline kit at 53.8 belt HP. 4.125 SM kit at 55.5 belt HP. 4.125 standard altitude M&W piston 400 engine 58.3 belt HP.
IH run tests on the 400 and 450 engines with standard elevation fire crater packages also dated 1964 and come up with 54 to 55 PTO HP.
IH tests used 29.92 inches of mercury barometric pressure and 60 degrees Fahrenheit air temp.
Interesting thing about the IH test papers I picked up is a stamp on them, Deere & CO. product planning sept. 3 1964. Looks like the companies tried to keep track of what the other was doing.

BarnyardEngineering · Aug 15, 2016

If it's making that much power, I'd be looking at other sources of the smoking besides bad rings. Could be worn valve guides.

KENIND · Aug 15, 2016

I have a 50 M that has been helped in the engine department and is turning 54 hp. On the pto dyno. Love listening to the straight pipe when I am plowing with it.

grizz665 · Aug 15, 2016

On the 100 pound and 110 pound compression
cylinders I get oil coming around spark
plugs

kub6040 · Aug 15, 2016

I have a 48' with a m&w striker and 4" domes , balanced and blue printed that makes 120 at 3000 rpm but not much over 60 @ rated rpm, my only thought if you want it to spin fast have it balanced trued end to end , and have a spare engine because they will spread iron and oil and leave a window on the side of the block you can stick your head in and find the problem.

Dyno Farmall M

grizz665

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rankrank1

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DeltaRed

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DeltaRed

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grizz665

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Highwayman

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D beatty

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D Slater

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BarnyardEngineering

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KENIND

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grizz665

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kub6040

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