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2. Two- and four-stroke engines - Wikipedia

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

   The M4+2 engine, also known as the double-piston internal combustion engine, is a type of internal combustion engine invented by Polish patent holder Piotr Mężyk. [1] The M4+2 engine took its name from a combination of two-stroke engines and four-stroke engines. The two-stroke combustion engine is characterized by a simple construction and ...

3. Outboard motor - Wikipedia

   en.wikipedia.org/wiki/Outboard_motor

   Four-stroke outboards have been sold since the late 1920s, such as the Roness and Sharland. In 1962 Homelite introduced a four-stroke outboard a 55-horsepower (41 kW) motor, based on the four-cylinder Crosley automobile engine. This outboard was called the Bearcat and was later purchased by Fischer-Pierce, the makers of Boston Whaler, for use ...

4. Two-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Two-stroke_engine

   Animation of a two-stroke engine. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston (one up and one down movement) in one revolution of the crankshaft in contrast to a four-stroke engine which requires four strokes of the piston in two crankshaft revolutions to complete a power cycle.

5. Four-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_engine

   Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.

6. Rotax - Wikipedia

   en.wikipedia.org/wiki/Rotax

   4-stroke, 4 cylinder boxer, spark ignition, liquid cooled heads, ram-air cooled cylinders, dry sump: Aspiration natural turbocharger: natural turbocharger+intercooler: Fuel delivery 2× CD carburetors: injection, dual channel FADEC: Fuel automotive petrol or AVGAS: Stroke 61 mm / 2.40 in Bore 79.5 mm / 3.13 in 84 mm / 3.31 in Displacement 1211 ...

7. Engine balance - Wikipedia

   en.wikipedia.org/wiki/Engine_balance

   The unbalance in the remaining driving wheels is caused by a crankpin and side rod weight. The side rod weights assigned to each crankpin are measured by suspending the rod on as many scales as there are crankpins or by calculation. The reciprocating piston–crosshead–main-rod–valve-motion link is unbalanced and causes a fore-and-aft surging.

8. Split-single engine - Wikipedia

   en.wikipedia.org/wiki/Split-single_engine

   The split-single uses a two-stroke cycle (i.e. where every downward stroke produces power) with the following phases: Pistons travel upwards, compressing the fuel-air mixture in both cylinders. A spark plug ignites the mixture (in the right side cylinder in the animation) when the pistons are near the top of the cylinders.

9. Marine propulsion - Wikipedia

   en.wikipedia.org/wiki/Marine_propulsion

   Some very long stroke engines have a maximum speed of around 80 rpm. The largest, most powerful engines in the world are slow speed, two stroke, crosshead diesels. Medium speed: any engine with a maximum operating speed in the range 300–1000 rpm. Many modern four-stroke medium speed diesel engines have a maximum operating speed of around 500 rpm.