PATENT (pdf) 

• Direct injection gasoline engines
• Indirect injection gasoline engines
• Diesel engines

Articulated rhombic prism pistons feature a rare concomitance of positive characteristics, which overcome all of the well known limitations of cylindrical piston engines, and may mark the birth of the ideal engine. Among their advantages, the following ones are most worth to be cited:

• 1. Doubled specific power (at the same rotational speed) or halved rotational speed (at the same output power);
• 2. More leveled output torque, similare to that of a 5-cylinder engine;
• 3. Drastic reduction of vibration and related power loss; simplification of dampers and acoustic insulations;
• 4. Elimination of the crankshaft;
• 5. Elimination of the camshafts;
• 6. Elimination of auxiliary transmission components for alternator, pumps, compressors, etc.;
• 7. Optimal space occupation and limited size.

CHARACTERISTICS (pdf) 
SIMULATOR (xls) 
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• Closed cycle Stirling engines
• Inverted cycle Stirling heat pumps

Conventional Stirling machines, based on cylindrical pistons, are operated at much lower pressure than internal combustion engines, so they cannot utilize piston rings and, in order to assure a good sealing, they require high precision machining of substantially larger cylinders. In many situations, these factors limit their economical feasibility.

Stirling machines based on articulated rhombic prism pistons:

• are less critical to manufacture, even at large sizes;
• can be optimized, at the design stage, for effective thermal exchange between the working fluid and the two parallel planes of the engine body, by varying the distance between said parallel planes;
• avoid any friction and wear by lateral forces on pistons, since pistons transmit torque to a crank parallely to said two parallel planes of the engine body.