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Thanks for the detailed response John, I cc'd my piston but only got 37.4cc for the volume of the dome. I did this by pressing a straight edge down on a piston until the very top of the crown was level with the cylinder walls.
Then I used the glass plate and burette to fill the void with 43.5cc of liquid. I must re-measure the dome height but my initial measurement of 16.1mm gave me a cylinder volume of 80.9cc.
Subtracting one from the other and I was left with a dome volume of 37.4cc.
I'll come back once I have double checked the dome height, perhaps an error here is why I am currently looking at <1mm deck height to get 9.8:1 compression.
andy
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