Process of altering the timing of a valve lift event
Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, 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. Increasingly strict emissions regulations are causing[1] many automotive manufacturers to use VVT systems.
Two-stroke engines use a power valve system to get similar results to VVT.
^US EPA, OAR (9 September 2016). "Regulations for Greenhouse Gas Emissions from Passenger Cars and Trucks". www.epa.gov. Retrieved 12 July 2022.
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Variablevalvetiming (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve...
VTEC (described as VariableValveTiming & Lift Electronic Control, but stands for ValveTiming Electronically Controlled) is a system developed by Honda...
be varied during engine operation by variablevalvetiming. It is also affected by the adjustment of the valve mechanism, and particularly by the tappet...
Variable camshaft timing (VCT) is an automobile variablevalvetiming technology developed by Ford. It allows for more optimum engine performance, reduced...
elimination of the throttle valve.[citation needed] When used in conjunction with variablevalvetiming (VVT), variablevalve lift can potentially offer...
VANOS is a variablevalvetiming system used by BMW on various automotive petrol engines since 1992. The name is an abbreviation of the German words for...
where the pump is driven by the timing chain. Later versions featured various improvements, such as variablevalvetiming, and NEO-Di designated VQ engines...
HR is a family of straight-3 12-valve and straight-4 16-valve automobile engines with continuously variablevalvetiming, involving development by Nissan...
inlet Variablevalvetiming gave the Twin Spark engine very good performance for its cubic capacity, but it is one of the weaker areas of the 16-valve engine...
but features Intake Valve Lift Control (IVLC) system provides two-stage variablevalve lift in addition to continuous variabletiming. Continuously commanded...
continuously variablevalvetiming MIVEC system applied not only to its intake valves but also to its exhaust valves. The intake and exhaust cam timing is continuously...
MultiAir or Multiair is a hydraulically-actuated variablevalvetiming (VVT) and variablevalve lift (VVL) engine technology enabling "cylinder by cylinder...
features an aluminum cylinder head with double overhead camshafts and variablevalvetiming. The 1.8L is a dual overhead cam (DOHC) inline 4-cylinder gasoline...
In 1998, the "technical update" (M52TU) upgrades included adding variablevalvetiming to the exhaust camshaft. The M52 was replaced by the M54 in the...
family consists of straight-four 16-valve all-aluminium and water cooled automobile engines with variablevalvetiming co-developed by Renault and Nissan...
aluminium engine block and a single row timing chain. In 1998, a Technical Update included VANOS (variablevalvetiming) for the intake camshafts. The S62...
fuel injection with variablevalvetiming (bear in mind that the "V" designation is not used here, as that is used for variablevalve lift) and is used...
valves per cylinder, a common rail injection system with a variable-geometry turbocharger. Most of those engine have the MIVEC variablevalvetiming system...
Toyota's Dual VVT-i, variablevalvetiming on both the intake and exhaust cams. The cams are driven using a timing chain. Valves are driven by roller-follower...
gasoline-powered, use four valves per cylinder, and have a single timing belt that drives the overhead camshafts. VTEC variablevalvetiming is used on almost...
for a family of straight-four 16-valve all-aluminium gasoline engines with variablevalve lift and variablevalvetiming developed by BMW and PSA Peugeot...