Working Out Compression ratios

[con67]

Theres a toyota patent floating about the net about the chamber design they have a groove in the centre of the cloverleaf, Ive seen the pistons in real life, the peugeot sort of has the same design imo it should be deepened. I dont like the hg or skimming the whole piston ideas. I always wanted to try this with ceramics, still got the pistons and rods but no car to put them in