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This depends on a lot of factors.

Mostly though it would be the compression ratio, which is basically the ratio of the cylinder volume open/closed, and the stroke which would be the length, as well as the bore which would be the width.

So how much surface it is hitting (bore) would vary the pressure needed, along with how far it has to go (stroke), and finally how much voume it's actually compressing.

The cylinders are generally rated for the pressure needed, so I would look up what a cylinder leak test for your particular vehicle should be at minimum, then if it's 100psi you have a high baseline to start with.

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Q: How much pressure is required to push up and down the piston of a 4cylinder internal combustion engine?
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