Gas-powered internal combustion engine

An internal combustion engine comprising

• a housing;
• a solid ring rotatably located inside the housing, the solid ring having a central plane bisecting the ring into a first side and a second side;
• a first pair of diametrically opposed pistons on the first side;
• a second pair of diametrically opposed pistons on the second side, the first pair of diametrically opposed pistons offset from the second pair of diametrically opposed pistons by 90 degrees;
• and
• four end faces removably attached to the housing, each end face being associated with one piston each of the first and second pairs of pistons, each of the end faces having an intake port, an exhaust port, and a pressure relief port.

An internal combustion engine comprising:

• a housing;
• a circular ring rotatably located inside the housing, the ring having a plurality of pistons fixedly mounted thereon;
• a first end plate on a first side of the ring;
• a second plate on a second side of the ring, distal from the first side,
• wherein the first and second plates each rotate relative to the housing;
• and
• a plurality of end faces removably attached to the housing, each of the plurality of end faces being associated with one of the pistons, each of the end faces having an intake port, an exhaust port, and a pressure relief port.