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The pressure inside a closed cylinder when engine cranking varis based on engine starter motor speed. The manufacturer designs the engine with what is known as the compression ratio, this means the piston sweeps the volume of the cylinder compressing the air and fuel as it reaches top dead centre. The amount of pressure in a cylinder is not that important provided all cylinders are even, and the cylinder leakage is not excessive. Each manufacturer will have their own specifications for each engine they design.

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