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  2. Crankcase ventilation system - Wikipedia

    en.wikipedia.org/wiki/Crankcase_ventilation_system

    Intake manifold vacuum is applied to the crankcase via the PCV valve. The airflow through the crankcase and engine interior sweeps away combustion byproduct gases. This mixture of air and crankcase gases then exits, often via another simple baffle, screen, or mesh to exclude oil mist, through the PCV valve and into the intake manifold. On some ...

  3. Manifold vacuum - Wikipedia

    en.wikipedia.org/wiki/Manifold_vacuum

    Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intervening carburetor or throttle body leading to the intake manifold. It is a ...

  4. Rocker arm - Wikipedia

    en.wikipedia.org/wiki/Rocker_arm

    The most common use of a rocker arm is to transfer the motion of a pushrod in an overhead valve (OHV) internal combustion engine to the corresponding intake/exhaust valve. In an OHV engine the camshaft at the bottom of the engine pushes the pushrod upwards. The top of the pushrod presses upwards on one side of the rocker arm located at the top ...

  5. Inlet manifold - Wikipedia

    en.wikipedia.org/wiki/Inlet_manifold

    Carburetors used as intake runners A cutaway view of the intake of the original Fordson tractor (including the intake manifold, vaporizer, carburetor, and fuel lines). An inlet manifold or intake manifold (in American English) is the part of an internal combustion engine that supplies the fuel/air mixture to the cylinders. [1]

  6. Valvetrain - Wikipedia

    en.wikipedia.org/wiki/Valvetrain

    A valvetrain is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. [1] The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) into the combustion chamber, while the exhaust valves control the flow of spent exhaust gases out of the ...

  7. Engine control unit - Wikipedia

    en.wikipedia.org/wiki/Engine_control_unit

    The main functions of the ECU are typically: Fuel injection system; Ignition system; Idle speed control (typically either via an idle air control valve or the electronic throttle system) Variable valve timing and/or variable valve lift systems; The sensors used by the ECU include: [2]