Re: Compression Ratio of M pistons and heads

Posted by Janicholson on July 21, 2007 at 09:43:59 from (71.87.39.51):

In Reply to: Compression Ratio of M pistons and heads posted by Tex Farmall on July 20, 2007 at 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

Replies:

• Re: Compression Ratio of M pistons and heads ChadS 08:54:27 07/22/07 (0)

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