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Determining a vehicle engine's compression ratio without disassembling it can be approached through indirect methods, though these might not deliver pinpoint accuracy as physical measurement would. One practical method is to use a compression tester. Though typically used to measure the compression pressure in an engine's cylinders, with some additional data and calculations, it can give you insights into the compression ratio. Firstly, perform a compression test to measure the pressure in psi (or bar) in a cylinder at top dead center. Then, you'll need the atmospheric pressure reading, which you can find for your specific location and time. By using the formula CR = (Measured Pressure + Atmospheric Pressure) / Atmospheric Pressure, you can approximate the compression ratio. Remember, this gives you a ballpark figure rather than an exact value because the method doesn't account for all variables that affect the compression ratio, such as cylinder volume changes due to wear or the exact position of the piston at top dead center during the test. Always consult your vehicle's manual or manufacturer's resources for more precise information if available. This approach provides a way to estimate compression ratio, helpful for diagnostics or understanding engine performance without the need for disassembly.
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