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Variable valve timing information


Cylinder head of Honda K20Z3. This engine uses continuously variable timing for the inlet valves

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.

  1. ^ 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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Variable valve timing

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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...

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VTEC

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VTEC (described as Variable Valve Timing & Lift Electronic Control, but stands for Valve Timing Electronically Controlled) is a system developed by Honda...

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Valve timing

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be varied during engine operation by variable valve timing. It is also affected by the adjustment of the valve mechanism, and particularly by the tappet...

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Variable camshaft timing

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Variable camshaft timing (VCT) is an automobile variable valve timing technology developed by Ford. It allows for more optimum engine performance, reduced...

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Variable valve lift

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elimination of the throttle valve.[citation needed] When used in conjunction with variable valve timing (VVT), variable valve lift can potentially offer...

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BMW N20

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turbocharged four-cylinder DOHC petrol engine with variable valve lift and variable valve timing which replaced the N53 (or BMW N52 in some markets)...

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VANOS

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VANOS is a variable valve timing system used by BMW on various automotive petrol engines since 1992. The name is an abbreviation of the German words for...

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Nissan VQ engine

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where the pump is driven by the timing chain. Later versions featured various improvements, such as variable valve timing, and NEO-Di designated VQ engines...

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Nissan HR engine

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HR is a family of straight-3 12-valve and straight-4 16-valve automobile engines with continuously variable valve timing, involving development by Nissan...

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Alfa Romeo Twin Spark engine

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inlet Variable valve timing 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...

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MIVEC

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MIVEC (Mitsubishi Innovative Valve timing Electronic Control system) is the brand name of a variable valve timing (VVT) engine technology developed by...

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Toyota JZ engine

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170 PS) at 6000 rpm and 235 N⋅m (173 lb⋅ft) at 4800 rpm. VVT-i variable valve timing was added in 1995, for an output of 147 kW (197 bhp; 200 PS) at...

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GM Ecotec engine

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but features Intake Valve Lift Control (IVLC) system provides two-stage variable valve lift in addition to continuous variable timing. Continuously commanded...

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Mitsubishi 4B1 engine

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continuously variable valve timing MIVEC system applied not only to its intake valves but also to its exhaust valves. The intake and exhaust cam timing is continuously...

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Variable Valve Event and Lift

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Nissan Variable Valve Event and Lift (commonly abbreviated as VVEL) is an automobile variable valve timing technology developed by Nissan. Nissan VVEL...

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MultiAir

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MultiAir or Multiair is a hydraulically-actuated variable valve timing (VVT) and variable valve lift (VVL) engine technology enabling "cylinder by cylinder...

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World Gasoline Engine

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features an aluminum cylinder head with double overhead camshafts and variable valve timing. The 1.8L is a dual overhead cam (DOHC) inline 4-cylinder gasoline...

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BMW M52

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In 1998, the "technical update" (M52TU) upgrades included adding variable valve timing to the exhaust camshaft. The M52 was replaced by the M54 in the...

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Nissan MR engine

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family consists of straight-four 16-valve all-aluminium and water cooled automobile engines with variable valve timing co-developed by Renault and Nissan...

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BMW M62

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aluminium engine block and a single row timing chain. In 1998, a Technical Update included VANOS (variable valve timing) for the intake camshafts. The S62...

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List of Nissan engines

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fuel injection with variable valve timing (bear in mind that the "V" designation is not used here, as that is used for variable valve lift) and is used...

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BMW M50

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M50TU ("technical update"), which was BMW's first engine to use variable valve timing. Called single VANOS by BMW, the system adjusted the phasing of...

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Mitsubishi 4N1 engine

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valves per cylinder, a common rail injection system with a variable-geometry turbocharger. Most of those engine have the MIVEC variable valve timing system...

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Toyota GR engine

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Toyota's Dual VVT-i, variable valve timing on both the intake and exhaust cams. The cams are driven using a timing chain. Valves are driven by roller-follower...

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Honda J engine

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gasoline-powered, use four valves per cylinder, and have a single timing belt that drives the overhead camshafts. VTEC variable valve timing is used on almost...

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Prince engine

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for a family of straight-four 16-valve all-aluminium gasoline engines with variable valve lift and variable valve timing developed by BMW and PSA Peugeot...

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