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  2. Variator (variable valve timing) - Wikipedia

    en.wikipedia.org/wiki/Variator_(variable_valve...

    Oil flow to the variator is controlled by a solenoid valve. When engine speed reaches a certain speed, normally 1500-2000 rpm in the Twin Spark application, the solenoid energises, causing pressurised oil to be directed through the inlet camshaft into the variator. The inlet camshaft position is advanced 25 degrees, thus increasing valve ...

  3. VVT-i - Wikipedia

    en.wikipedia.org/wiki/VVT-i

    The VVT system is a 2-stage hydraulically controlled cam phasing system. VVT-i varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt or chain) and intake camshaft. Engine oil pressure is applied to an actuator to adjust the camshaft position.

  4. Crankshaft position sensor - Wikipedia

    en.wikipedia.org/wiki/Crankshaft_position_sensor

    A crank sensor (CKP) [1] [2] [3] is an electronic device used in an internal combustion engine, both petrol and diesel, to monitor the position or rotational speed of the crankshaft. This information is used by engine management systems to control the fuel injection or the ignition system timing and other engine parameters

  5. Variable camshaft timing - Wikipedia

    en.wikipedia.org/wiki/Variable_camshaft_timing

    For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...

  6. Desmodromic valve - Wikipedia

    en.wikipedia.org/wiki/Desmodromic_valve

    The 1914 Grand Prix Delage and Nagant (see Pomeroy "Grand Prix Car") used a desmodromic valve system (quite unlike the present day Ducati system). [ 4 ] Azzariti, a short-lived Italian manufacturer from 1933 to 1934, produced 173 cc and 348 cc twin-cylinder engines, some of which had desmodromic valve gear, with the valve being closed by a ...

  7. N-VCT - Wikipedia

    en.wikipedia.org/wiki/N-VCT

    N-VTC varies valve timing by rotating the affected camshaft relative to the sprocket; valve lift and duration are not altered. This rotation is achieved when an electric solenoid, controlled by the car's ECU, allows pressurized engine oil to flow into and through the cam and into a slave mechanism, axially advancing camshaft timing relative to ...

  8. Camless piston engine - Wikipedia

    en.wikipedia.org/wiki/Camless_piston_engine

    Because camless engines have no camshaft, they may have fewer moving parts.In these systems, the camshaft follower, rocker arms, and/or pushrods have been replaced by an electro-hydraulic actuator system which uses the existing oil pumps, thus reducing development risks of the new system by employing existing technology. [11]

  9. Solenoid valve - Wikipedia

    en.wikipedia.org/wiki/Solenoid_valve

    Solenoid valves. A solenoid valve is an electromechanically operated valve.. Solenoid valves differ in the characteristics of the electric current they use, the strength of the magnetic field they generate, the mechanism they use to regulate the fluid, and the type and characteristics of fluid they control.

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