Someone here had asked me about figureing compression. I will explain this the best i can. Volume of a cylinder: (Pie (Pi?) x radius squared) x height (stroke) FYI--cubic inches x 16.383 = cubic centimeters For example: Say the stroke is 3.25 " , radius 2.020. 3.25 x 3.14 x 2.020 squared = 40.23 40.23 x 16.383 = 659.1 cubic cent. Let's pretend the combustion chamber is 66 cc. 659.1 divided by 66 equals 9.98. So you end up with 10-1 compression. Hope this helps.
