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  2. Valve timing - Wikipedia

    en.wikipedia.org/wiki/Valve_timing

    With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in drawing in the fresh charge. Engine designers ...

  3. Air flow bench - Wikipedia

    en.wikipedia.org/wiki/Air_flow_bench

    For example, a 1-inch-diameter (25 mm) valve would be lifted a maximum of 0.350 inch. During flow testing the valve would be set at L/D 0.05 0.1 0.15 0.2 0.25 0.3 and readings taken successively. This allows the comparison of efficiencies of ports with other valve sizes, as the valve lift is proportional rather than absolute.

  4. Honda F engine - Wikipedia

    en.wikipedia.org/wiki/Honda_F_engine

    Revised Intake System. The intake system was simplified in shape to reduce induction resistance and noise. A larger twin-chambered air box designed to dampen resonant intake tract noise replaces the previous Accord's smaller, single-chamber damper. The new box is 10.7 liters in capacity, compared to the older unit's 8.2 liters.

  5. Restrictor plate - Wikipedia

    en.wikipedia.org/wiki/Restrictor_plate

    Artist rendering of a NASCAR restrictor plate. A restrictor plate or air restrictor is a device installed at the intake of an engine to limit its power. This kind of system is occasionally used in road vehicles (e.g., motorcycles) for insurance purposes, but mainly in automobile racing, to limit top speed to provide equal level of competition, and to lower costs; insurance purposes have also ...

  6. Variable-length intake manifold - Wikipedia

    en.wikipedia.org/wiki/Variable-length_intake...

    In double overhead camshaft (DOHC) designs, the air paths may sometimes be connected to separate intake valves [citation needed] so the shorter path can be excluded by de-activating the intake valve itself. Pressurisation A tuned intake path can have a light pressurising effect similar to a low-pressure supercharger due to Helmholtz resonance ...

  7. VTEC - Wikipedia

    en.wikipedia.org/wiki/VTEC

    A Honda K24A Engine with i-VTEC. VTEC (described as Variable Valve Timing & Lift Electronic Control, but stands for Valve Timing Electronically Controlled) is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine, resulting in higher performance at high RPM, and lower fuel consumption at low RPM.

  8. IOE engine - Wikipedia

    en.wikipedia.org/wiki/IOE_engine

    The exhaust rockers act directly on the valves, whilst the inlet rockers act on pushrods running up to a second set of longer flat rockers operating the inlet valves. The Rover engine, like many 1940s and earlier British designs, was a small bore, long stroke ( undersquare ) engine to keep the RAC tax horsepower rating as low as possible, thus ...

  9. Heated air inlet - Wikipedia

    en.wikipedia.org/wiki/Heated_air_inlet

    A heated air inlet or warm air intake is a system commonly used on the original air cleaner assemblies of carburetted engines to increase the temperature of the air going into the engine for the purpose of improving the consistency of the air/fuel mixture to reduce engine emissions and fuel usage. [1]

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