Re: how can i get more power out of my 1943 m

Posted by Phil Auten (Tx) on July 31, 2002 at 09:52:26 from (63.173.243.93):

In Reply to: how can i get more power out of my 1943 m posted by emmett on July 30, 2002 at 18:35:40:

The 4" sleeves by themselves will only yield about 4 HP. The Super M had slightly higher compression than the M to get the other 4 HP difference. If you can find one, get a LP head from a Super M to get the compression up further. Also, the Super M used aluminum pistons instead of cast iron and this may account for the difference in compression. With the aluminum pistons and LP head you should realize about 6.75:1 compression ratio instead of the standard 5.65:1 of the M. If you can't find or afford the LP head, have your head milled a little and use the Super M pistons. There are formulas for figuring out the change in compression ratios for different amounts of material removed in the milling process, but I can't find the book I have that lists them. Go lightly, about .010-.020" and see what happens.
Remember that milling the head will alter the valvetrain geometry and your pushrods may have to be shortened to compensate for the change if you can't get the valves to adjust to spec after the change.
Also, try to find a M&W governor weight kit or similar. This will retard the action of the governor and give higher max RPM. If you are pulling, check your club rules to be sure this won't disqualify you.
Open up the main jet slightly after you get the tractor running and work up to the size that gives you best power.

Good luck,
Phil

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