Now you can easily measure the volume of the compression chamber, assemble the cylinder, piston and cylinder head, you can use grease for sealing. Pour water inside and you have an accurate figure for the size of the compression chamber, if CR is 1:17 the volume is 44 cc, if CR is 1:20 the volume is 37 cc. This difference is made by a 0.9 mm gasket, well, if you want CR 1:13, you need a 3 mm thick gasket.
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Doing your assembled volume measurement use a light oil instead of water. The residue film left will protect the metals. And you will have less leakage past the piston rings.
Tilt the whole engine to have the open injector hole up; at the highest point. Bang on the engine assembly with a length of wood to shake loose any air bubbles.
S.U.
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