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  2. Porsche flat-twelve engine - Wikipedia

    en.wikipedia.org/wiki/Porsche_flat-twelve_engine

    The 917 and its engine's domination, the oil crisis, and fiery tragedies like Roger Williamson's in Zandvoort pushed the SCCA to introduce a 3 miles per U.S. gallon maximum fuel consumption rule for 1974. Due to this change, the Penske 917/30 competed in only one race in 1974, and some customers retrofitted their 917/10K with naturally ...

  3. Rev limiter - Wikipedia

    en.wikipedia.org/wiki/Rev_limiter

    Formula One engines can rev up to 15,000 rpm as per Formula One rules [5] because of their smaller displacement, low mass, and short stroke. Engines with hydraulic tappets (such as the Buick/Rover V8) often have in effect a rev limiter by virtue of their design. The tappet clearances are maintained by the flow of the engine's lubricating oil.

  4. Mean piston speed - Wikipedia

    en.wikipedia.org/wiki/Mean_piston_speed

    The comparison of mean piston speed (black line) with real piston speed (color lines). Diagram shows one stroke from BDC to TDC. Revolution = 1.000 min-1, stroke = 88 mm. The connecting rod ratio l/r varies: 3 - red, 4 - green, 5,5 - blue. The mean piston speed is the average speed of the piston in a reciprocating engine. It is a function of ...

  5. Tachometer - Wikipedia

    en.wikipedia.org/wiki/Tachometer

    The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common. The word comes from Ancient Greek τάχος (táchos) 'speed' and μέτρον (métron) 'measure'. Essentially the words tachometer and speedometer have identical meaning: a device that measures speed. It ...

  6. Revolutions per minute - Wikipedia

    en.wikipedia.org/wiki/Revolutions_per_minute

    Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min −1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to ⁠ 1 / 60 ⁠ hertz .

  7. Mean motion - Wikipedia

    en.wikipedia.org/wiki/Mean_motion

    with dimensions of radians per unit time, degrees per unit time or revolutions per unit time. [2] [3] The value of mean motion depends on the circumstances of the particular gravitating system. In systems with more mass, bodies will orbit faster, in accordance with Newton's law of universal gravitation. Likewise, bodies closer together will ...

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