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  2. Patulous Eustachian tube - Wikipedia

    en.wikipedia.org/wiki/Patulous_Eustachian_tube

    The exact causes may vary depending on the person and are often unknown. [5] Weight loss is a commonly cited cause of the disorder due to the nature of the Eustachian tube itself and is associated with approximately one-third of reported cases. [6] Fatty tissues hold the tube closed most of the time in healthy individuals.

  3. Two-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_power_valve_system

    It is the same simplicity in design, however, that causes a two-stroke engine to be less fuel-efficient and produce high specific levels of undesirable exhaust gas emissions. At the bottom of the power stroke, the transfer ports, which deliver fresh fuel-air mixture, are open at the same time as the exhaust port.

  4. Variable valve timing - Wikipedia

    en.wikipedia.org/wiki/Variable_valve_timing

    It also improves volumetric efficiency, because there is less exhaust gas to be expelled on the exhaust stroke. [3] Early/late exhaust valve closing Early and late exhaust valve closing timing can be manipulated to reduce emissions. Traditionally, the exhaust valve opens, and exhaust gas is pushed out of the cylinder and into the exhaust ...

  5. Back-fire - Wikipedia

    en.wikipedia.org/wiki/Back-fire

    This causes an incomplete burn which causes the fumes to explode in the exhaust system along with an audible pop or bang sound. This is a result of working equipment, and is unlikely to cause damage. A fuel-injected engine may backfire if an intake leak is present (causing the engine to run lean), or a fuel injection component such as an air ...

  6. Expansion chamber - Wikipedia

    en.wikipedia.org/wiki/Expansion_chamber

    When the transfer is complete, the piston is on the compression stroke but the exhaust port is still open, an unavoidable problem with the two stroke piston port design. To help prevent the piston pushing fresh mixture out the open exhaust port the strong acoustic wave (produced by the combustion) from the expansion chamber is timed to arrive ...

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  8. Crankcase ventilation system - Wikipedia

    en.wikipedia.org/wiki/Crankcase_ventilation_system

    The intake manifold vacuum, with wide open throttle, is lower in these conditions, which causes the PCV valve to open and the crankcase gases flow to the intake system. [13] The greater flow rate of intake air during these conditions means that a greater quantity of blow-by gases can be added to the intake system without compromising the ...

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