This mechanical shifting (or phasing) of the camshaft affects the efficiency of the engine in. Variable Valve Timing and Lift Electronic Control, or VTEC ®, debuted in the late 1980s as a way to extract maximum horsepower and torque from smaller displacement engines without using turbocharging. Variable valve timing is one of the most effective ways to increase an engine’s power output without having to make it bigger or add more components. Watch as Jason Fenske of Engineering Explained walks us through VVL and VVT in much more interesting detail. The VVT Sprocket mechanically shifts the position of the camshaft. This allows for more control over how much air-fuel mixture is in the cylinder (less under light-load driving, more when power is needed), controlling temperature and emissions.īut that's only a very basic explanation. Essentially, it allows the engine to advance or retard the valve timing using oil pressure. Variable valve timing, on the other hand, is used mainly for emissions control. Under regular conditions, the engine will use the low-lift cam to operate the valves, but under higher load, a solenoid switches the engine over to the to the high-lift cam (or cams), increasing valve travel and therefore, performance. Instead of having one cam profile for the entire rev range, a VVL engine has two: low-lift and high-lift. The 3.7-liter V-6 in the Mustang uses BorgWarner’s system, too, as do the. Variable valve lift is mainly used to enhance performance. A short programme of testing was conducted using the Mitchell VVT design applied to a 1600 cc four cylinder petrol engine. CTA variable valve timing debuted on Ford’s 3.0-liter Duratec V-6, beginning with the 2009 Escape and the 2010 Fusion. These systems sound pretty similar, but what do they actually do? Luckily, there's a real engineer here to explain it to us. Variable valve lift (VVL) and variable valve timing (VVT) are two of the most popular ones. Manufacturers like to use a lot of acronyms on their cars.
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