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2. Opposed-piston engine - Wikipedia

   en.wikipedia.org/wiki/Opposed-piston_engine

   A 1914 Simpson's balanced two-stroke engine. An opposed-piston engine is a piston engine in which each cylinder has a piston at both ends, and no cylinder head.Petrol and diesel opposed-piston engines have been used mostly in large-scale applications such as ships, military tanks, and factories.

3. Two- and four-stroke engines - Wikipedia

   en.wikipedia.org/wiki/Two-_and_four-stroke_engines

   Opposed-piston engines have been tried before in both 2 stroke and 4 stroke, the combination of the two different cycles is unique to this engine. The engine has a far greater efficiency over the break-even value known to combustion engines (about 35%) and closer to the one associated with steam turbines or electric engines (about 70%).

4. Flat-four engine - Wikipedia

   en.wikipedia.org/wiki/Flat-four_engine

   A flat-four engine, also known as a horizontally opposed-four engine or boxer engine, [1] is a four-cylinder piston engine with two banks of cylinders lying on opposite sides of a common crankshaft. The most common type of flat-four engine is the boxer-four engine, each pair of opposed pistons moves inwards and outwards at the same time.

5. Engine configuration - Wikipedia

   en.wikipedia.org/wiki/Engine_configuration

   H engines have been produced with between 4 and 24 cylinders. An opposed-piston engine is similar to a flat engine in that pairs of pistons are co-axial but rather than sharing a crankshaft, instead share a single combustion chamber per pair of pistons. The crankshaft configuration varies amongst opposed-engine designs.

6. Lycoming O-360 - Wikipedia

   en.wikipedia.org/wiki/Lycoming_O-360

   The Lycoming O-360 is a family of four-cylinder, direct-drive, horizontally opposed, air-cooled, piston aircraft engines.Engines in the O-360 series produce between 145 and 225 hp (110 and 170 kW), with the basic O-360 producing 180 hp (130 kW).

7. Lycoming IO-390 - Wikipedia

   en.wikipedia.org/wiki/Lycoming_IO-390

   The IO-390 was developed from the similar IO-360 engine, by using cylinders from the IO-580 [citation needed] to increase the O-360's cylinder bore. (Although the IO-390 cylinder assembly [4] is not the same part number as the IO-580, [5] the cylinder barrels of both have a 5.318 bore and 4.375 stroke dimension.)

8. Four-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_engine

   The original Atkinson-cycle piston engine allowed the intake, compression, power, and exhaust strokes of the four-stroke cycle to occur in a single turn of the crankshaft and was designed to avoid infringing certain patents covering Otto-cycle engines. [4] Due to the unique crankshaft design of the Atkinson, its expansion ratio can differ from ...

9. Lycoming O-235 - Wikipedia

   en.wikipedia.org/wiki/Lycoming_O-235

   The Lycoming O-235 is a family of four-cylinder, air-cooled, horizontally opposed, piston aircraft engines that produce 100 to 135 hp (75 to 101 kW), derived from the earlier O-233 engine.