Final Engine Compression Ratio?
a few measurements and a couple of picts, thanks for all the responses
piston TDC .159" to .228" - couldn't get aa repeatable measurement LOL
bowl depth on head at deepest point .681"
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I see the problem with trying to get a flat Plexiglas plate over the piston protrusion, but there is a way.
Move the piston down into the bore a known - exact distance, lets say one inch.
Then cover the cylinder, and add the fluid and get the number of cc's it takes to fill it with the piston crown as the bottom surface and the Plexiglas plate as the top flat surface.
Then based upon your bore size calculate how many cc's of fluid would take to fill it to a height of one inch with a flat bottom and top surface.
Subtract the actual measured cc from the calculated empty bore cc and you will have the cc's of the piston head.
Obviously an inch is overkill, I did that to make the illustration easy, You just need to lower the piston enough so it does not protrude, but you need to know that exact distance to be able to calculate the flat bottom volume
