Re: Re: Re: Thanks for the input on the M fellows--comparison questions now.

Posted by john d on August 13, 2000 at 15:44:33 from (206.141.74.34):

In Reply to: Re: Re: Thanks for the input on the M fellows--comparison questions now. posted by Rich (ks)---Teach me!! on August 12, 2000 at 12:30:22:

Rich, you probably won't go wrong with a good specimen of either model. The engines of these things have been modified over the years in a high percentage of the tractors you'll encounter. The hp data is the way the came out of the factory, but many farmers opted to take advantage of some "updating" and modifications when overhaul time came around. The H started life as roughly 2/3 the weight and power of an M. Both can be pushed into lots more power with either aftermarket or IH -produced sleeve and piston sets. These typically offered a little increase in piston diameter by using a thinner-walled sleeve. Many times these kits also included higher-compression pistons, and parts which altered the distributor advance. Some other common changes included governor modifications. Lots of these old tractors run several rpms above the stock setting, and some have aftermarket kits that made the governor more responsive and longer-lasting.
Untold numbers of M tractors have the same displacement as the stock SuperM because of the larger sleeves and pistons. In like manner, lots of SM and 400 models have the same displacement as a stock 450. Similar changes were made in the H line, though a SuperH and a 300 have more displacement than the upgraded H will typically have.
Another factor is compression. I've got a '43 H that was a "distillate" tractor on steel wheels when it came out. It's had some "improvements" over the years, but it still has the low compression (distillate) head. The last time it was overhauled, Dad put some high altitude pistons in it. Made such an improvement, he stuck those things into the M and SM when their turn came! M has dynoed at 52hp, a considerable jump over stock.
At one time there was quite an aftermarket industry built on upgrading these tractors. M&W, Heisler, IH, and some small-time wizards all offered parts to increase performance.
Good luck in your tractor search, and don't assume that the insides of the engine are the way they came out of the factory!

Follow Ups:

• Re: Re: Re: Re: Thanks for the input on the M fellows--comparison questions now. Rich (ks)-----Thank You John d!~~~~~~~~~~ 18:22:40 08/13/00 (0)

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