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Farmall & IHC Tractors Discussion Forum
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Engine Bore of M and SM

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terryjd98

08-08-2003 21:35:30




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I was wondering if anybody knew if the Engine of the M and Super M were bored the same size just with different sized sleeves in them or if the Super M was a bigger bore engine.

Thanks

Terry




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Doug in OR

08-10-2003 09:08:43




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 Re: Engine Bore of M and SM in reply to terryjd98, 08-08-2003 21:35:30  
The Super M was bored larger. You can take an M and use 4 inch pistons by using an overbore kit. They used thinner sleeves for this. You can take a Super M engine and go from a 4 inch bore to a 4.125 bore simply by using an overbore kit. These kits consisted of the larger pistons and a thinner sleeve.

You cannot take an M engine and put a 4.125 kit in it, unless you bore the engine or run it without sleeves.

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randy hall

08-09-2003 07:08:35




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 Re: Engine Bore of M and SM in reply to terryjd98, 08-08-2003 21:35:30  
a super m block has 1/8" larger cylinders. the sleevess are the same thickness.



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Farmall Don

08-09-2003 06:40:23




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 Re: Engine Bore of M and SM in reply to terryjd98, 08-08-2003 21:35:30  
I believe the M had a 3-7/8 bore and 5-1/4 stroke and the super M had a 4 inch bore and a 5-1/4 stroke. Giving a 247.7 vs 263.9 displacements in cubic inches.



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