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  2. Reversing gear - Wikipedia

    en.wikipedia.org/wiki/Reversing_gear

    This means that the forces in the valve gear can be transmitted to the lever. This is especially the case if the engine has unbalanced slide valves, which have a high operating friction and are subject to steam forces on both sides of the valve. This friction meant that if the Johnson bar is unlatched while the engine is operating under high ...

  3. Valve timing - Wikipedia

    en.wikipedia.org/wiki/Valve_timing

    With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in drawing in the fresh charge. Engine designers ...

  4. Cutoff (steam engine) - Wikipedia

    en.wikipedia.org/wiki/Cutoff_(steam_engine)

    In a steam engine, cutoff is the point in the piston stroke at which the inlet valve is closed. On a steam locomotive, the cutoff is controlled by the reversing gear.. The point at which the inlet valve closes and stops the entry of steam into the cylinder from the boiler plays a crucial role in the control of a steam engine.

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  6. Valve gear - Wikipedia

    en.wikipedia.org/wiki/Valve_gear

    Deeley valve gear - fitted to several express locomotives on the Midland Railway. The combination levers were driven, as normal, from the crossheads. Each expansion link was driven from the crosshead on the opposite side of the engine. Young valve gear - used the piston rod motion on one side of the locomotive to drive the valve gear on the ...

  7. Polaris RMK - Wikipedia

    en.wikipedia.org/wiki/Polaris_RMK

    The RMK was introduced in the 1996 model year by Polaris to compete in the mountain market. The acronym originally stood for "Rocky Mountain King". The RMK name is still in use today, has been used on many chassis and engine variations, and is primarily used to indicate the snowmobile is designed for mountain or deep-snow use.

  8. Two-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_power_valve_system

    The Honda Revolution Control valve is designed and works in principle like the "AETC system." A small computer monitors engine RPM and adjusts a two-blade exhaust valve with an electric servo. Honda equipped many two-stroke motorcycles such as the NSR125 and NSR250 models with RC - Valve power plants.

  9. Straight-twin engine - Wikipedia

    en.wikipedia.org/wiki/Straight-twin_engine

    1964 Sanglas Rovena motorcycle engine (built by Hispano Villiers) 1997 Suzuki GS500 motorcycle engine. A straight-twin engine, also known as an inline-twin, vertical-twin, inline-2, or parallel-twin, is a two-cylinder piston engine whose cylinders are arranged in a line along a common crankshaft.