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Variable Valve Timing (VVT) Basic Theory. After multi-valve technology became standard in engine design, Variable Valve Timing becomes the next step to enhance engine output, no matter power or torque. As you know, valves activate the breathing of engine. The timing of breathing, that is, the timing of air intake and exhaust, is controlled by ...
In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems.
VVT systems are simple to diagnose. Most parts are non-serviceable and have integrated sensors. On a conventional engine, exhaust and intake valves are open or closed depending on the crankshaft and the pattern cannot be altered. With VVT, it is possible to have the timing altered to match the engine speed, torque requirements, and valve overlap.
Variable Valve Timing diagram. Furthermore, the newer generation VVT design implements 'Continuous Variable Valve Timing' or CVVT system. Besides, the CVVT varies the valve timing continuously (or infinitely) which is digitally controlled by the engine ECU.Additionally, it optimizes the valve timing for all engine speeds and conditions. Although there are different mechanisms to achieve the ...
How to determine if the Variable Valve Timing (VVT) System is malfunctioning? The check engine light (CEL) will be activated when the powertrain control module (PCM) detects unordinary engine conditions. A poor performing or failed Variable Valve Timing (VVT) system will result in poor engine idle/stalling, increased engine noise and reduced power output.
The purpose of variable valve timing is to ensure that the valves open and close at the right time to maximize engine performance and reduce fuel consumption. When the VVT solenoid is malfunctioning, the entire system can be compromised, which may result in intake and exhaust valves opening and closing at the wrong time.
The variable valve timing solenoid is new technology found in select vehicles as part of the VVT system. This system benefits your car by raising your fuel efficiency, increasing horsepower, and lowering emissions using the intake and exhaust valves operated by the camshafts. Oil pressure is a factor when the VVT solenoid is working and you can ...
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The VVT is called variable volume because it delivers a variable volume to each zone, as load dictates. It is called variable temperature because the temperature of the air supplied by the central unit varies with time. The VVT is an economical all air zone system that is ideal for many commercial jobs.
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Variable valve timing is a concept that was put in use decades ago in aircraft engines, with experiments in sliding camshafts and other concepts. But how? Source | smlive903. Variable valve timing (vvt) systems. The lobes on the camshaft are egg-shaped and make contact with the lifter or rocker arm for a specific amount of time (duration).
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