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  2. 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.

  3. Mercury Marine - Wikipedia

    en.wikipedia.org/wiki/Mercury_Marine

    The reed valve blocks served as intermediate main bearings. ... Six cylinder two-stroke engine in 1984. Mercury Marine is a marine ... the Mark 25 (20 hp) and the ...

  4. Outboard motor - Wikipedia

    en.wikipedia.org/wiki/Outboard_motor

    Mercury Marine, Mercury Racing, Tohatsu, Yamaha Marine, Nissan and Evinrude each developed computer-controlled direct-injected two-stroke engines. Each brand boasts a different method of DI. Fuel economy on both direct-injected and four-stroke outboards measures from a 10 percent to 80 percent improvement compared with conventional two-strokes ...

  5. Evinrude Outboard Motors - Wikipedia

    en.wikipedia.org/wiki/Evinrude_Outboard_Motors

    Evinrude produced two-stroke direct-injected engines ranging from 25 hp (19 kW) to a 3.6L V8 250HP & 300 HP in 1985 and change to 4.0L V8 250 HP & 300 HP in 1986 onward to the end of the production of the V8 configuration.

  6. Two-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_power_valve_system

    A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...

  7. Poinsard 25hp 2-cyl - Wikipedia

    en.wikipedia.org/wiki/Poinsard_25hp_2-cyl

    The first two engines built by Mengin were designed by René Poinsard and are often referred to by his name The Mengin B or Poinsard 25 hp was the first and smaller of the two. Aimed at very small, single seat sport aircraft it went into production from about 1933. Production ceased when France was invaded in 1940. [1]