Bore^2 x pie x stroke/4 is the formula for displacement. The displacement is multiplied by the number of cylinders to find the total displacement in the engine.
COMPRESSION RATIO IS A COMPARISON OF TWO QUANTITIES AND IS STATED AS A NUMERICAL RELATIONSHIP. A COMPRESSION RATIO IA BASED ON THE ENGINE COMBUSTION CHAMBER VOLUME WHILE THE PISTON IS AT THE BOTTOM OF ITS TRAVEL COMPARED WITH THE VOLUME WHEN THE PISTON IS AT THE TOP.y