The Multi-tasking of isotropic pressure

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The internal pressure of the cylinder is described as Isotropic pressure, meaning, the first work applied to the crank-piston surface, is not affected by another second work applied to the surface of the floating piston, unless the second work changes the mean effective pressure of the cylinder, by moving in the same or the opposite direction.

Acting on the floating piston, to move in the same direction,  increases the mean effective pressure during the time of a power stroke of the crank-Piston, and that means we have a synergic effect relation between the two pistons.

Have we applied the work output of the floating piston motion, to operate as an oil pump, then such work output of the oil pump is not considered as part of the friction losses suffered in conventional engine, because, while such work is performed as a result of the combustion forces, it is in fact a byproduct of an isotropic pressure that can act on two or more surfaces, synergically without deducting one work output from the other, as long as the two surfaces are not moving in opposite directions, and not affecting the volume, the way done in the opposite-pistons model. 

In the opposite pistons cylinder, each piston is responsible for traveling half of the distance of the power stroke, and each piston is responsible of decreasing the isotropic pressure equally.

The floating piston on the other hand, moves in the same initial direction like the crank-piston, causing an increase in the isotropic pressure applied to the crank-piston, and even if it acts as an oil pump, the work output of such oil pump, is an added gained work of the total Relative-Cylinder work output, above the work performed by the crank-cylinder.