super m output

switching sides · Oct 18, 2008

what is the cheapest hp gain on a super m to the 55-60 hp range?

the tractor vet · Oct 18, 2008

Well depending on just what is inside the engine for pistons and what shape the cam is in 60 HP is not out of the question here . I am pulling 60 HP out of my S/MTA with 4 1/8 M&W flat tops With my dist. set up on the timing curve and has real good bottom end performance will spike on overload to 68 hp , Now my one buddy's S/MTA with the 8500ft high Alt. pistons in 4 1/8th with a stock 450 cc. and just port matchen along with a 450 carb and tweeking on the dist. will pull 94 hp at PTo speed on 93 octane gas. This tractor is used everyday on the farm .

Ed pap · Oct 18, 2008

Hello,
I am interested in setting the timming to get low end tourque. I did 2 H motors this summer they ran great. i don't like to use HP numbers, I am not sure if my dyno is calibrated right. they were both over RPMs less than 10%. and i had 37 and 36 hp at rated speed. one has a dist. and the other has a mag. both tractors pulled good but they just lost it at the end. I know my H has pulled better Years ago.
Any advice or help would be great.
Thanks Ed

james rumph · Oct 18, 2008

I have a P-400 dyno and we have learned to dyno them between 400 and 540 rpm on the PTO.

Set the timing under full load with a digital tach/timing light, go for the highest rpm under load.

You will be shocked at the HP that can be gained by timing this way.

Put light springs in the Dist. so the weights will give full advance in timing.

the tractor vet · Oct 18, 2008

Well i don't know about you but that sure ain't the way i set up a dist. mine are all done on a dist strobe and as far as what works best has taken me years of playing with them . And a lite set of springs just don't cut it . As to giving out my timing curve well that just ain't ah going to happen . and total dist. advance is cut back to what here again i ain't sayen . But the guys that have run my set up can tell ya that from top all the way down till ya can see the fan blade going around they don't die. This is tractor pullen not drag racing . And yes i can set up and old dual point system that will do the job.

Gearnut · Oct 21, 2008

Jim, our last dyno session was to include a timing adjustment while under load at a MUCH lower rpm (like 1000) to see if we could improve low-end torque.

Instead, we made Jiffy Pop....

Mark Osborne

Red SW6 · Oct 21, 2008

[b:7d6aa11ae8]Hi,
Here is what I did to my SM to make 65-70hp>>
4 1/8 flatops, 450 cam. Rejetted the carb, heavier gov. spring.
I do my distributors on a syncro graph, try and hit 22-25 degrees total at full rpm. If you look up the specs for the distributors there is a degree reading for several different RPM's on the way up to full RPM. You can check that with a timing light and a digital tach right on the tractor. I'm not convinced more advance is the answer. As engine horsepower went up in the C-248/26/281 engine series, total advance went down. All of my tractors run distributors, and they have great bottom end lugging power.
HTH
Ken[/b:7d6aa11ae8]

charles todd · Oct 22, 2008

94 HP from a SMTA that can be used in the field!!! WOW! I am begining to consider a Super M more and more every post. CHEAP HP...

Charles

super m output

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