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I don't think that the 2nd link will work to find compression ratio. It doesn't take piston dome into account. Looks like it assumes flat top pistons.

Of course I haven't had coffee yet this morning, so my brain might still be numb.
 

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I don't think that the 2nd link will work to find compression ratio. It doesn't take piston dome into account. Looks like it assumes flat top pistons.

Of course I haven't had coffee yet this morning, so my brain might still be numb.
You could just substract the dome volume from the combustion chamber volume or if it's a dished piston add the volume.
 
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