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Farmall & IHC Tractors Discussion Forum
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Compression Ratio of M pistons and heads

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Tex Farmall

07-20-2007 22:08:43




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I recently bought an M with a suffix code of X1B, which decodes to be a 5000ft high altitude motor. I know the pistons are going to be different than a regular M, but does anyone know for sure if the head is also different (i.e. smaller chamber)? Also what would be the actual compression ratio with 5000ft pistons?
Would the high altitude head from an M be better than a regular head from a Super M for making power?

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Janicholson

07-21-2007 09:43:59




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 Re: Compression Ratio of M pistons and heads in reply to Tex Farmall, 07-20-2007 22:08:43  
Tex, Compression ratio is a math problem that for any engine has to have the measurements taken. Area of the cyl bore (Area=pi*radius of bore squared) times the stroke. This (for one cylinder) is its swept volume, or displacement.
Next you need the displacement of the combustion chamber (with the piston crown sticking up from the block deck subtracted from it. Turning the head upside down and putting measured water in the combustion chamber works. Putting the piston crown into a calibrated beaker to the depth of the crown will give that difficult displacement. With the numbers, will be the compression ratio Swept volume compressed into the combustion chamber volume.
The most important elememt is the compression pressure. this is a dynamic factor that on farmalls can be as high as 175 or more on some stock gas engines (or much higher on pulling engines running special fuels. Someone may respond with some numbers, but this is the best I can do. Pressure below 140 probably can use regular fuel. over 150 will need premium. JimN

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ChadS

07-22-2007 08:54:27




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 Re: Compression Ratio of M pistons and heads in reply to Janicholson, 07-21-2007 09:43:59  
IH was playing with cyl pressure quite a bit back then. A engine could have a 7 to 1 mechanical ratio and have a cyl pressure of 10 to 1. ChadS



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