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Old 9th February 2010, 09:44   #31
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Just wanted to mention one thing which my good friend told me when he read the articke """All these are various acronyms for essentially the same thing, Variable Valve Timing. Similar to TC'd common rail diesel engines. Mahindra calls it Crde, MUL calls it DDis, Hyundai calls it Crdi etc..

IIRC, Alfa Romeo was the first company to use variable valve timing in production cars. However Honda was the first to come out with a system (VTEC) that could switch between to different camshaft profiles"""

Nice info.
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Old 9th February 2010, 09:54   #32
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Nice article there, its explained in simple words that most people should be able to understand.

Any pictures of VTec?

By the way thanks for the article
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Old 9th February 2010, 14:09   #33
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Default Example::BMW VVT Technology Vanos / Double-Vanos

Do you ever wonder how superb powerful cars like BMW gives such a wonderful power and performance without compromising the fuel efficiency ?

The answer is VANOS:

VANOS stands for "variable Nockenwellensteuerung", which means automobile variable valve timing. The technology was invented by BMW and first introduced in 1992 & entered in production in 1997.

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The Double-VANOS continuously adjust the intake & exhaust manifold, camshaft for better performance at Low & High speed. This leads to higher torque at low speed and higher fuel economy at high speed.


At lower engine speeds, the position of the camshaft is moved so the valves are opened later, as this improves idling quality and smooth power development.

As the engine speed increases, the valves are opened earlier: this enhances torque, reduces fuel consumption and lowers emissions.

At high engine speeds, the valves are opened later again, because this allows full power delivery.

Double-VANOS also controls the amount of exhaust gas that is re-circulated back to the intake manifold, enhancing fuel economy. The system uses a special set of parameters in the engine’s warming-up phase in order to help the catalytic converter reach its ideal operating temperature more quickly, lowering emissions. The entire process is controlled by the vehicle’s Digital Motor Electronics (DME).
Source : BMW VVT Technology Vanos / Double-Vanos
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Old 9th February 2010, 14:16   #34
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Similar thread.

http://www.team-bhp.com/forum/techni...on-thread.html (Variable Valve Timing discussion thread)
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Old 9th February 2010, 14:28   #35
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Mods note: Thread merged.
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