The total stroke of the valve needle (14) is thereby divided into a clearance stroke and a residual stroke.

The compression piston (23, 23a, 23b) performs alternately an intake stroke and a compression stroke and the power piston (11a, 11b) performs alternately a power stroke and an exhaust stroke.

The stroke of the valve needle (18) is made up of a pre-stroke and a residual stroke.

One of the cylinders is adapted for an air and fuel intake and a compression strokes only, and the other of the cylinders adapted for power and exhaust strokes only.

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The piston (4) executes a working stroke and a return stroke in the duct.

The pumping stroke is followed by a return stroke.

The piston (12) reciprocates in the cylinder (14) with a compression stroke and an inlet stroke.

Subsequently a compression stroke, a combustion stroke, and an exhaust stroke, which are identical to those in a four-cycle internal combustion engine, occur.

The feeding pistons of the feeding cylinder alternatively carry out a suction and a compression stroke.

A drive mechanism (10, 110) couples the working members so that they reciprocate together and a first of the working members performs an outlet stroke while a second of the working members performs a suction stroke.

The reciprocating fluid engine has a piston (7) in which every stroke is a drive stroke.

In this process, the mechanical translator (19) translates a stroke of the actuator (10) into a stroke of the nozzle needle (6).

Therefore, reliable closing of the ball valve (1) during an intake stroke following a delivery stroke is achieved.

The user interactively selects a desired racetrack and race.