Re: M tractor rebuild

Posted by Janicholson on December 22, 2006 at 21:57:45 from (66.173.50.69):

In Reply to: Re: M tractor rebuild posted by Scott Seaton on December 22, 2006 at 16:06:51:

The high altitude parts were used (stock) on IH/farmall tractors to compensate for use at 5000 ft above sea level, and 8000' above sea level. The compression was raised (I believe) with smaller combustion chambers, and pistons with domes/humps sticking up higher than the block. Todays regular unleaded fuel has enough octaine to prevent the higher compression from spark knocking even at sea level. Propane cylinder heads (from factory propane tractors) are also high compression. Cylinder head combustion chamber volume for one cylinder (and volume of piston hump subtracted if it has them) is placed on the right side of a math ratio with the volume of one cylinder on the left. For example if a chamber had a 60cc volume, and the cylinder (displaced volume was 500cc (bore area times stroke)) the ratio would be 500:60 or 8.3333:1.
The kits from here are well liked. The carb from a 450 is needed. All mentioned parts are bolt on replacement. Good luck, JimN

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