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  2. Polaris RMK - Wikipedia

    en.wikipedia.org/wiki/Polaris_RMK

    For the 1997 model year Polaris added twin cylinder case-reed inducted 700cc engines. They followed in 1998 with a 600cc version for those wanting a smaller displacement engine to the potent 700cc. Both the 600cc and 700cc engines were built in the US and used 39mm Keihin D-slide carburetors and digital CDI ignition and utilized a 136"x15"x1.75 ...

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  4. Polaris Slingshot - Wikipedia

    en.wikipedia.org/wiki/Polaris_Slingshot

    Polaris Slingshot on Live Oak Road, Orange County, CA. Beginning with the 2020 model year, the Slingshot is powered by a 2.0 L inline four-cylinder gasoline-powered Polaris ProStar Engine rated at 203 hp (151 kW; 206 PS) at 8250 rpm and 144 pound force-feet (195 N⋅m) of torque at 6500 rpm.

  5. 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 ...

  6. Reversing gear - Wikipedia

    en.wikipedia.org/wiki/Reversing_gear

    Control is by a small three-way steam valve (“forward”, “stop”, “back”) and a separate indicator showing the position of the rod and thus the percentage of cutoff in use. When the steam valve is at “stop”, an oil cock connecting the two ends of the locking piston is also closed, thus holding the mechanism in position. The piston ...

  7. Polaris Inc. - Wikipedia

    en.wikipedia.org/wiki/Polaris_Inc.

    Polaris began developing a smaller consumer-sized, front-engine snowmobile to compete with the Ski-Doo in the early 1960s. In 1964, Polaris released the Comet. However, the Comet soon ran into problems as it could not travel in all types of snow conditions. Polaris then recalled the sleds and quickly developed a new prototype to avoid ...

  8. Reversing valve - Wikipedia

    en.wikipedia.org/wiki/Reversing_valve

    A reversing valve removed from an HVAC heat pump for replacement. A reversing valve is a type of valve and is a component in a heat pump, that changes the direction of refrigerant flow. By reversing the flow of refrigerant, the heat pump refrigeration cycle is changed from cooling to heating or vice versa. This allows a residence or facility to ...

  9. Camless piston engine - Wikipedia

    en.wikipedia.org/wiki/Camless_piston_engine

    Camless valve trains have long been investigated by several companies, including Renault, BMW, Fiat, Valeo, General Motors, Ricardo, Lotus Engineering who developed electro-hydraulic valve actuation in the late 1980s as a spinoff of their active suspension program (both utilised similar electro-hydraulic actuation and control), Ford, Jiangsu Gongda Power Technologies, and Koenigsegg's sister ...