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  2. Reverse-flow cylinder head - Wikipedia

    en.wikipedia.org/wiki/Reverse-flow_cylinder_head

    The inlet manifold of a reverse-flow cylinder head may be connected to the exhaust by a heat riser to transfer further heat, improving low rpm response and emissions as a result. Costs can be reduced in production engines by casting the inlet and exhaust manifolds as one unit. This also transfers further heat to the inlet eliminating the need ...

  3. Edelbrock - Wikipedia

    en.wikipedia.org/wiki/Edelbrock

    Eighty years after Vic Edelbrock Sr. manufactured the first Flathead Ford intake manifold, the Edelbrock company now designs and manufactures camshaft and lifter kits, carburetors, crate engines, cylinder heads, electronic fuel injection, engine blocks, engine dress-up, fuel pumps, intake manifolds, nitrous oxide injection, power packages ...

  4. 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.

  5. Fuel saving device - Wikipedia

    en.wikipedia.org/wiki/Fuel_saving_device

    Other organizations generally considered reputable, such as the American Automobile Association and Consumer Reports have performed studies with the same result. [3] [4] One reason that ineffective fuel-saving gadgets are popular is the difficulty of accurately measuring small changes in the fuel economy of a vehicle.

  6. 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 ...

  7. Two-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_power_valve_system

    A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...

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