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How to figure out what compression should be using MATHS!?!

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Old 01-20-15, 12:25 AM
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How to figure out what compression should be using MATHS!?!

So, I'm wondering if you can figure out what you should be getting on a compression test by using measurements of the motor. Like in a piston motor you can take the bore, stroke, combustion chamber size, blah blah and calculate it to figure out what you should be getting from a compression test.

Is this possible to do with a rotary engine?
Old 01-20-15, 12:44 PM
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probably, but you could also look in the shop manual, and it will tell you...
Old 01-21-15, 09:02 AM
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Originally Posted by j9fd3s
probably, but you could also look in the shop manual, and it will tell you...
It doesn't say.

It's an old sachs km-48 from the 70's.
Old 01-21-15, 09:49 AM
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whats the compression ratio and port timing? i can put it in my piston software
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