Mechanism showing operation.

With compression ratio doubling

The doubling of the compression ratio causes the compression ratio of the Energy Storage Piston, while functioning, to return to that of a standard piston, after ignition has taken place and the spring is fully compressed.

The pressure and therefore heat losses will then be the same as a standard engine in the same circumstances, but the spring will be loaded with half the energy as a result of the combustion. This spring energy is not lost to the cylinder walls, as it has been converted into strain energy in the spring, and is now available for output torque.

The engine therefore behaves as a standard engine that has had its compression ratio doubled but without the inevitable problems that this would cause, for example, "pinking". This increase in output energy, compared with a standard piston, results in an increase in efficiency from the engine, producing more miles per gallon hence fewer emissions per mile.

In this case a driver of a vehicle fitted with Energy Storage Pistons would have to throttle back to achieve the same speed as a standard piston engine, causing the fuel consumption and exhaust emissions to reduce proportionately.