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  2. Critical speed - Wikipedia

    en.wikipedia.org/wiki/Critical_speed

    Both calculate an approximation of the first natural frequency of vibration, which is assumed to be nearly equal to the critical speed of rotation. The Rayleigh–Ritz method is discussed here. For a shaft that is divided into n segments, the first natural frequency for a given beam, in rad/s , can be approximated as:

  3. Engine balance - Wikipedia

    en.wikipedia.org/wiki/Engine_balance

    Engine balance refers to how the inertial forces produced by moving parts in an internal combustion engine or steam engine are neutralised with counterweights and balance shafts, to prevent unpleasant and potentially damaging vibration. The strongest inertial forces occur at crankshaft speed (first-order forces) and balance is mandatory, while ...

  4. Forced induction in motorcycles - Wikipedia

    en.wikipedia.org/.../Forced_induction_in_motorcycles

    Bill Warner's 300+ mph turbo Hayabusa, set speed record for non-enclosed bike in 2011. Warner crashed it in 2013, resulting in his death. [37] Cabin motorcycles: Peraves Ecomobile, available with turbocharged BMW K1200 inline-four engine; "the only [fully-]enclosed motorcycle to enter long-term production" [38] Motorcycle land speed record ...

  5. Compression ratio - Wikipedia

    en.wikipedia.org/wiki/Compression_ratio

    Motorsport engines often run on high-octane petrol and can therefore use higher compression ratios. For example, motorcycle racing engines can use compression ratios as high as 14.7:1, and it is common to find motorcycles with compression ratios above 12.0:1 designed for 95 or higher octane fuel.

  6. Motorcycle testing and measurement - Wikipedia

    en.wikipedia.org/wiki/Motorcycle_testing_and...

    With power typically being the product of force and speed, a motorcycle's power and torque ratings will be highly indicative of its performance. Reported numbers for power and torque may however vary from one source to another due to inconsistencies in how testing equipment is calibrated, the method of using that equipment, the conditions during the test, and particularly the location that ...

  7. Understeer and oversteer - Wikipedia

    en.wikipedia.org/wiki/Understeer_and_oversteer

    It is involved in other properties such as characteristic speed (the speed for an understeer vehicle where the steer angle needed to negotiate a turn is twice the Ackermann angle), lateral acceleration gain (g's/deg), yaw velocity gain (1/s), and critical speed (the speed where an oversteer vehicle has infinite lateral acceleration gain).

  8. Harley-Davidson Milwaukee-Eight engine - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_Milwaukee...

    The Harley-Davidson Milwaukee-Eight engine is the ninth generation of "big twin" engines developed by the company, but only Harley's fourth all-new Big Twin in 80 years, first introduced in 2016. These engines differ from the traditional Harley Big Twin engines in that there are four valves per cylinder, totaling eight valves, hence the name.

  9. Rotordynamics - Wikipedia

    en.wikipedia.org/wiki/Rotordynamics

    Rotordynamics (or rotor dynamics) is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures. It is commonly used to analyze the behavior of structures ranging from jet engines and steam turbines to auto engines and computer disk storage.