significantly better for the same volume of engine the inventive mech has four times the displacement of an ordinary gasoline motor which translates to four times the power but since mech has less friction loss it is projected that a mech engine would have five times the power of the same size gasoline motor or conversely a mech engine would weigh about one fifth the weight of a gasoline engine for the same power a mech engine can be used as the power plant of a car or truck or it can be used as the power source in a hybrid automobile mech engines can also be manufactured for lawn mowers motorcycles electric power generators their lightweight would make them attractive for chain saws and other handheld power equipment large mech diesel or gasoline engines can used in electric power plants home or business self generation units can be constructed using small mech engines it is known that rolling friction is much less than sliding friction pistons sliding in cylinders have high friction losses in the present invention rolling friction is involved when two rotating pistons roll together rather than slide along their longitudinal axes most people associate the word u201c piston u201d with a cylindrical object that slides axially in a cylinder in the present description a u201c rotating piston u201d is defined to be a partial cylinder that oscillates in a rotating.