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I'm installing a piston set in a Skoda Estelle 120 engine. I know this is not a definite way to measure piston to deck clearance, but it jumped to my mind to measure it with a vernier caliper using its rod to measure depths: all pistons are about 1.4 mm under the cylinder liner top. This is what the manual says:

Bore x stroke (mm): 72 x 72 Cubic capacity (cc): 1174 Compression ratio: 9.5:1

Not a word about piston deck clearance. So question is: is 1.4 mm under deck acceptable? I know it affects compression...would it mean it will be a bland engine? What PSI a compression test would yield, more or less?

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EDIT: this ain't Porsche :) but I'm reading in Porsche 911 the deck height should be between 1 and 1.5mm, with a 75 mm bore

Aram Alvarez
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Do the calculations: you have bore & stroke and compression ration. You could work out the volume in the cylinder head. Then you will know if they match.

The workshop manual should tell you what the compression test values should be.

Solar Mike
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