M or Super M

KTNC · Sep 30, 2012

I am looking to go pulling in an antique club, that is essentially for stock tractors. Can have up to 20% hp over factory test, up to 2 tire sizes bigger, etc... I really want a Super M, bigger CI, but without the heavier TA, etc... It seems however M's are more prevalent. My question - can an M be "coverted" to a Super M, or are there too many aesthetic differences? I want it to be period realistic...

D Slater · Sep 30, 2012

Over 60,000 SM tractors made without a T/A and over 30,000, maybe over 35,000 made without live hydraulics. If you want it to look stock, be lighter and allowed 20% more power over factory rating. I would use a non live hydraulic SM. About the same weight as a M and can have more power.
Ment to say the rules would let you have more power with a SM. M could be built for the same power but since they had a lower rated horse power engine and if the rules are strickly enforced the M would not pass if making the same power as a 20% over SM.

Janicholson · Sep 30, 2012

The M will have the ability to use larger thin wall sleeves, and high compression pistons. .050 can be milled form the head. A 450 carb manifold and cam can add more power. But then a SM can be enlarged as well. in the same manor to make it even more powerful. It will take premium fuel, and careful timing to get it dialed in with no spark knock, but they will make power. Don't take RPM much beyond 2200 or you will be doing a lot of parts replacement. Jim

Bill(Wis) · Sep 30, 2012

There are several of those Super Ms minus TA that are in the photo ads right now.

M or Super M

KTNC

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D Slater

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Janicholson

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Bill(Wis)

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