exhaust valve annular membranes 230 the sequence of drawings shows the approximate timing of the engine cycle intake stroke as illustrated in fig9 a during the intake stroke the intake valves are open 220 while the exhaust valves 230 are closed the fuel air mixture 30 is drawn into the opening combustion chamber by negative pressure relative to ambient created in the expanding combustion chamber through the valve holes 240 compression stroke as illustrated in fig9 b during the compression stroke the intake valves 220 are closed with the exhaust valves 230 remaining closed causing the fuel air mixture to be compressed as the volume in the combustion chamber decreases and ultimately to ignite 470 via compression ignition power stroke as illustrated in fig9 c during the power stroke energy from the charge ignition 470 drives the combustion chamber open imparting power via the hydraulic fluid to drive the resonance of the power spring membrane for the next cycle and providing net power for electrical output exhaust stroke as shown in fig9 d during the exhaust stroke the exhaust valves 230 are opened and the exhaust gases 40 are pumped out through valve holes 230 as the combustion chamber again compresses leaving the combustion chamber empty except for a residual amount of exhaust for the beginning of the next intake.