A 1:1 ratio is equal to 0 PSI. 14.7 PSI is equal to a 2:1 ratio. Just multiply your ratio by 14.7 to get PSI, or divide PSI by 14.7 to get ratio.
This is only in a perfect cylinder where valves close exactly as the piston reaches the bottom and stays closed the whole way, and if no air bleeds out from the valves, or between the piston and cylinder wall. Not to mention the difference between if it's hot or cold. Plus, according to the math problem, if you had a compression ratio of 1:1, you would be pushing 14.7 psi. So there isn't any REAL way of telling an engines compression ratio without getting the specs for everything.
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Compression ratio is a ratio of the volume of gas in an engine's cylinder before and after combustion. To convert compression ratio to psi (pounds per square inch), you would need additional information such as the specific engine's cylinder volume, operating conditions, and fuel type to calculate the pressure generated during combustion. It is not a direct conversion and depends on various factors specific to the engine.
You can't convert a RATIO (which is a pure number) to a MEASUREMENT such as psi. You get such a ratio by dividing two different pressures, for example.
251.37
To convert 14.73 psi to 15.025 psi, you need to increase the pressure by the difference between the two values. Subtract 14.73 from 15.025, which gives you 0.295 psi. Therefore, you can achieve the conversion by adding 0.295 psi to 14.73 psi, resulting in 15.025 psi.
Multiply psi by 0.006894759086775369 to convert from psi to MPa. ex: 1000 psi = 1000 x 0.006894759086775369 = 6.89 MPa http://www.chapelsteel.com/psi-mpai.html
190 kPa is equivalent to approximately 27.56 psi.