Variable valve timing, or VVT, is a generic term for an automobile piston engine technology. VVT allows the lift or duration or timing (some or all) of the intake or exhaust valves (or both) to be changed while the engine is in operation. Two-stroke engines use a Power valve system to get similar results to VVT. Karl Benzs Velo model (1894) - entered into the first automobile race An automobile or motor car (usually shortened to just car) is a wheeled passenger vehicle that carries its own motor. ... Components of a typical, four stroke cycle, DOHC piston engine. ... An intake is an air intake for an engine. ... Look up exhaust in Wiktionary, the free dictionary. ... A poppet valve is a valve consisting of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. ... The two-stroke cycle of an internal combustion engine differs from the more common four-stroke cycle by having only two strokes (linear movements of the piston) instead of four, although the same four operations (intake, compression, power, exhaust) still occur. ... The 2-stroke power valve system is an improvement to a conventional two-stroke engine that gives a high power output over a wider RPM range. ...

Overview

The i-VTEC system found in the Honda K20Z3.

Piston engines normally use poppet valves for intake and exhaust. These are driven (directly or indirectly) by cams on a camshaft. The cams open the valves (lift) for a certain amount of time (duration) during each intake and exhaust cycle. The timing of the valve opening and closing is also important. The camshaft is driven by the crankshaft through timing belts, gears or chains. Image File history File links K20_head. ... Image File history File links K20_head. ... VTEC (standing for Variable valve Timing and lift Electronic Control) is a system developed by the car manufacturer Honda to improve the efficiency (and thus power) of its internal combustion engines. ... The logo of the Honda automobiles The logo of the Honda motorcycles Honda Motor Company, Limited )   (TYO: 7267 , NYSE: HMC), or simply called Honda, is a Japanese multinational corporation, engine manufacturer and engineering corporation. ... A cylinder head from a Honda K20Z3. ... Components of a typical, four stroke cycle, DOHC piston engine. ... A poppet valve is a valve consisting of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. ... monkey ... Computer animation of a camshaft The camshaft is an apparatus often used in piston engines to operate poppet valves. ... Timing belt A timing belt, timing chain or cam belt is a part of an internal combustion engine that controls the timing of the engines valves. ... Spur gears found on a piece of farm equipment A gear is a wheel with teeth around its circumference, the purpose of the teeth being to mesh with similar teeth on another mechanical device -- possibly another gear wheel -- so that force can be transmitted between the two devices in a... Roller chain and sprocket Roller chain or bush roller chain is the type of chain most commonly used for transmission of mechanical power on bicycles, motorcycles, and in industrial and agricultural machinery. ...

The profile, or position and shape of the cam lobes on the shaft, is optimized for a certain engine rpm, and this tradeoff normally limits low-end torque or high-end power. VVT allows the cam profile to change, which results in greater efficiency and power. rpm or RPM may mean: revolutions per minute RPM Package Manager (originally called Red Hat Package Manager) RPM (movie) RPM (band), a Brazilian rock band RPM (magazine), a former Canadian music industry magazine In firearms, Rounds Per Minute: how many shots an automatic weapon can fire in one minute On... Torque applied via an adjustable end wrench Relationship between force, torque, and momentum vectors in a rotating system In physics, torque (or often called a moment) can informally be thought of as rotational force or angular force which causes a change in rotational motion. ... hp, see HP (disambiguation) The horsepower (hp) is the name of several non-metric units of power. ...

At high engine speeds, an engine requires large amounts of air. However, the intake valves may close before all the air has been given a chance to flow in, reducing performance.

On the other hand, if the cam keeps the valves open for longer periods of time, as with a racing cam, problems start to occur at the lower engine speeds. This will cause unburnt fuel to exit the engine since the valves are still open. This leads to lower engine performance and increased emissions.

Pressure to meet environmental goals and fuel efficiency standards is forcing car manufacturers to turn to VVT as a solution. Most simple VVT systems (like Mazda's S-VT) advance or retard the timing of the intake or exhaust valves. Others (like Honda's VTEC) switch between two sets of cam lobes at a certain engine RPM. Still others (like BMW's Valvetronic) can alter timing and lift continuously, which is called Continuous variable valve timing or CVVT. This article or section does not cite any references or sources. ... S-VT, or Sequential Valve Timing, is an automobile variable valve timing technology developed by Mazda. ... The logo of the Honda automobiles The logo of the Honda motorcycles Honda Motor Company, Limited )   (TYO: 7267 , NYSE: HMC), or simply called Honda, is a Japanese multinational corporation, engine manufacturer and engineering corporation. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... BMW, or Bayerische Motoren Werke, is an independent German company and manufacturer of automobiles and motorcycles. ... Also see: Variable Valve Timing, VTEC, VVT-i, VANOS This BMW innovation is the first production Variable Valve Timing system to offer continuously variable timing (on both intake and exhaust camshafts) along with continuously variable intake valve lift, on the intake camshaft only. ... Continuous variable valve timing allows the intake and/or exhaust valve timing to be varied during engine operation. ...

History

Fiat was the first auto manufacturer to patent a functional variable valve timing system which included variable lift. Developed by Giovanni Torazza in the late 1960s, the system used hydraulic pressure to vary the fulcrum of the cam followers (US Patent 3,641,988). The hydraulic pressure changed according to engine speed and intake pressure. The typical opening variation was 37%. Fiat S.p. ... The 1960s decade refers to the years from January 1, 1960 to December 31, 1969, inclusive. ...

In September 1975, General Motors patented a system intended to vary valve lift. GM was interested in throttling the intake valves in order to reduce emissions. This was done by minimizing the amount of lift at low load to keep the intake velocity higher, thereby atomizing the intake charge. GM encountered problems running at very low lift, and abandoned the project. Year 1975 (MCMLXXV) was a common year starting on Wednesday (link will display full calendar) of the Gregorian calendar. ... General Motors Corporation, also known as GM, is the worlds largest auto company by annual production volume as of 2006, and the second largest by sales volume as of the first half of 2007, behind Toyota Motor Corporation. ... General Motors Corporation, also known as GM, is the worlds largest auto company by annual production volume as of 2006, and the second largest by sales volume as of the first half of 2007, behind Toyota Motor Corporation. ... General Motors Corporation, also known as GM, is the worlds largest auto company by annual production volume as of 2006, and the second largest by sales volume as of the first half of 2007, behind Toyota Motor Corporation. ...

Alfa Romeo was the first manufacturer to use a variable valve timing system in production cars (US Patent 4,231,330). The 1980 Alfa Romeo Spider 2.0 L had a mechanical VVT system in Spica fuel injected cars sold in the USA. Later this was also used in the 1983 Alfetta 2.0 Quadrifoglio Oro models as well as other cars. Alfa Romeo is an Italian automobile manufacturing company, founded as Darracq Italiana by Cavaliere Ugo Stella, an aristocrat from Milan in partnership with the French automobile firm of Alexandre Darracq. ... Year 1980 (MCMLXXX) was a leap year starting on Tuesday (link displays the 1980 Gregorian calendar). ... Alfa Romeo Spider Duetto. ... Year 1983 (MCMLXXXIII) was a common year starting on Saturday (link displays the 1983 Gregorian calendar). ... The Alfa Romeo Alfetta was a rear-wheel drive executive saloon car and fastback coupé produced from 1972 until 1984 by Alfa Romeo. ...

In 1986, Nissan developed their own form of VVT with the VG30DE(TT) engine for their Mid-4 Concept. Nissan chose to focus their NVCS (Nissan Valve-Timing Control System) mainly at low and medium speed torque production because the vast majority of the time, engine RPMs will not be at extremely high speeds. The NVCS system can produce both a smooth idle, and high amounts of low and medium speed torque. Although it can help a little at the top-end also, the main focus of the system is low and medium range torque production. The VG30DE engine was first used in the 300ZX (Z31) 300ZR model in 1987, this was the first production car to use electronically controlled VVT technology. Year 1986 (MCMLXXXVI) was a common year starting on Wednesday (link displays 1986 Gregorian calendar). ... Nissan Motor Co. ... The VG engine family consists of V6 piston engines designed and produced by Nissan for several vehicles in the Nissan lineup. ... Nissan Motor Co. ... Nissan Variable Cam Timing (commonly known as N-VCT or VCT or NVCS) is an automobile variable valve timing technology developed by Nissan. ... Nissan Motor Co. ... Nissan Variable Cam Timing (commonly known as N-VCT or VCT or NVCS) is an automobile variable valve timing technology developed by Nissan. ... The VG engine family consists of V6 piston engines designed and produced by Nissan for several vehicles in the Nissan lineup. ... The Nissan 300ZX, also known as the Nissan Fairlady Z is a sports car produced by Nissan Motor Company. ... Year 1987 (MCMLXXXVII) was a common year starting on Thursday (link displays 1987 Gregorian calendar). ...

Honda's VTEC motorcycle engine employed on the Japanese market-only Honda CBR400F in 1983 provided as a technology basis for VTEC. The next step was taken in 1989 by Honda with the VTEC system. Honda had started production of a system that gives an engine the ability to operate on two completely different cam profiles, eliminating a major compromise in engine design. One profile designed to operate the valves at low engine speeds provides good road manners, low fuel consumption and low emissions output. The second is a high lift, long duration profile and comes into operation at high engine speeds to provide an increase in power output. The VTEC system was also further developed to provide other functions in engines designed primarily for low fuel consumption. The first VTEC engine Honda produced was the B16A which was installed in the Integra, CRX, and Civic hatchback available in Japan and Europe. In 1991 the Acura/Honda NSX powered by the C30A became the first VTEC equipped vehicle available in the US. VTEC can be considered the first "cam switching" system and is also one of only a few currently in production. VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... Year 1983 (MCMLXXXIII) was a common year starting on Saturday (link displays the 1983 Gregorian calendar). ... Year 1989 (MCMLXXXIX) was a common year starting on Sunday (link displays 1989 Gregorian calendar). ... The logo of the Honda automobiles The logo of the Honda motorcycles Honda Motor Company, Limited )   (TYO: 7267 , NYSE: HMC), or simply called Honda, is a Japanese multinational corporation, engine manufacturer and engineering corporation. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... The logo of the Honda automobiles The logo of the Honda motorcycles Honda Motor Company, Limited )   (TYO: 7267 , NYSE: HMC), or simply called Honda, is a Japanese multinational corporation, engine manufacturer and engineering corporation. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... The logo of the Honda automobiles The logo of the Honda motorcycles Honda Motor Company, Limited )   (TYO: 7267 , NYSE: HMC), or simply called Honda, is a Japanese multinational corporation, engine manufacturer and engineering corporation. ... The B-series Honda engines are the most popular and well known of the Honda engines. ... The Integra, sold as an Acura in North America, and as a Honda elsewhere, was a small, sporty front-wheel drive vehicle sold both as a sedan and hatchback. ... mk1 Honda Civic CRX The Honda Civic CRX, originally launched as the Honda Ballade CR-X in Japan, is a compact sports car manufactured by Honda. ... This article needs additional references or sources for verification. ... Year 1991 (MCMXCI) was a common year starting on Tuesday (link will display the 1991 Gregorian calendar). ... Acura (アキュラ (Akyura)) is a luxury vehicle brand name based in Tokyo and is used by the Japanese car manufacturer Honda Motor Company in the US, Canada and Hong Kong since March 1986 to market luxury automobiles and near-luxury vehicles. ... The logo of the Honda automobiles The logo of the Honda motorcycles Honda Motor Company, Limited )   (TYO: 7267 , NYSE: HMC), or simply called Honda, is a Japanese multinational corporation, engine manufacturer and engineering corporation. ... The Honda NSX (Acura NSX in North America and Hong Kong) was a sports car produced between 1990 and 2005 by the Japanese automaker Honda. ... Hondas first V6 engines are members of a single family, the C-series. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... Motto: (Out Of Many, One) (traditional) In God We Trust (1956 to date) Anthem: The Star-Spangled Banner Capital Washington D.C. Largest city New York City None at federal level (English de facto) Government Federal constitutional republic  - President George Walker Bush (R)  - Vice President Dick Cheney (R) Independence from... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ...

In 1991, Clemson University researchers patented the Clemson Camshaft which was designed to provide continuously variable valve timing independently for both the intake and exhaust valves on a single camshaft assembly. This ability makes it suitable for both pushrod and overhead cam engine applications.^[1] Year 1991 (MCMXCI) was a common year starting on Tuesday (link will display the 1991 Gregorian calendar). ... Clemson University is a public, coeducational, land-grant, research university located in Clemson, South Carolina, United States. ... A pushrod engine or overhead valve (OHV) engine is a type of piston engine that places the camshaft below the pistons (usually beside and slightly above the crankshaft in a straight engine or directly above the crankshaft in the V of a V engine) and uses pushrods or rods to... Overhead cam (OHC) piston engines place the camshaft above the cylinder heads and drive the valves or lifters directly instead of using pushrods. ...

In 1992 BMW introduced the VANOS system. Like the Nissan NVCS system it could provide timing variation for the intake cam in steps (or phases), the VANOS system differed in that it could provide one additional step for a total of three. Then in 1998 the Double Vanos system was introduced which significantly enhances emission management, increases output and torque, and offers better idling quality and fuel economy. Double Vanos was the first system which could provide electronically controlled, continuous timing variation for both the intake and exhaust valves. In 2001 BMW introduced the Valvetronic system. The Valvetronic system is unique in that it can continuously vary intake valve lift, in addition to timing for both the intake and exhaust valves. The precise control the system has over the intake valves allows for the intake charge to be controlled entirely by the intake valves, eliminating the need for a throttle valve and greatly reducing pumping loss. The reduction of pumping loss accounts for more than a 10% increase in power output and fuel economy. Year 1992 (MCMXCII) was a leap year starting on Wednesday (link will display full 1992 Gregorian calendar). ... BMW, or Bayerische Motoren Werke, is an independent German company and manufacturer of automobiles and motorcycles. ... This does not adequately cite its references or sources. ... Nissan Motor Co. ... Nissan Variable Cam Timing (commonly known as N-VCT or VCT or NVCS) is an automobile variable valve timing technology developed by Nissan. ... This does not adequately cite its references or sources. ... Year 1998 (MCMXCVIII) was a common year starting on Thursday (link will display full 1998 Gregorian calendar). ... This does not adequately cite its references or sources. ... This does not adequately cite its references or sources. ... Year 2001 (MMI) was a common year starting on Monday (link displays the 2001 Gregorian calendar). ... BMW, or Bayerische Motoren Werke, is an independent German company and manufacturer of automobiles and motorcycles. ... Also see: Variable Valve Timing, VTEC, VVT-i, VANOS This BMW innovation is the first production Variable Valve Timing system to offer continuously variable timing (on both intake and exhaust camshafts) along with continuously variable intake valve lift, on the intake camshaft only. ... Also see: Variable Valve Timing, VTEC, VVT-i, VANOS This BMW innovation is the first production Variable Valve Timing system to offer continuously variable timing (on both intake and exhaust camshafts) along with continuously variable intake valve lift, on the intake camshaft only. ... In an engine, the throttle is the mechanism by which the engines power is increased or decreased. ... In short, Parasitic Loss is a loss that a parasite consumes from its host which may or may not be beneficial to the host. ... In short, Parasitic Loss is a loss that a parasite consumes from its host which may or may not be beneficial to the host. ...

Ford became the first manufacturer to use variable valve timing in a pickup-truck, with the top-selling Ford F-series in the 2004 model year. The engine used was the 5.4L 3-valve Triton. The F-Series is a series of full-size pickup trucks from Ford Motor Company sold for over 5 decades. ... shelby was here 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... The Triton engine is Fords line of modern truck engines. ...

In 2005 General Motors offered the first Variable Valve timing system for I-head V6 engines, LZE and LZ4. Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ... General Motors Corporation (NYSE: GM), also known as GM, is an American automobile maker with worldwide operations and brands including Buick, Cadillac, Chevrolet, GMC, Holden, Hummer, Opel, Pontiac, Saturn, Saab and Vauxhall. ... It has been suggested that this article or section be merged with Cam-in-block. ... The High Value engine family from General Motors is a group of large pushrod V6 engines. ...

In 2007 DaimlerChrysler became the first manufacturer to produce a cam-in-block engine with independent control of exhaust cam timing relative to the intake. The 2008 Dodge Viper uses Mechadyne's concentric camshaft assembly to help boost power output to 600 Bhp. Year 2007 (MMVII) is now the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... DaimlerChrysler AG (ISIN: DE0007100000) is a German car corporation and the worlds fifth largest car manufacturer. ... Wikipedia does not have an article with this exact name. ...

VVT Implementations

• Aftermarket Modifications - Conventional hydraulic tappet can be engineered to rapidly bleed-down for variable reduction of valve opening and duration.
• Alfa Romeo Twin Spark - TS stands for "Twinspark" engine, it is equipped with Variable Valve Timing technology.
• BMW Valvetronic - Provides continuously variable lift for the intake valves; used in conjunction with Double VANOS.
• BMW VANOS - Varies intake timing by rotating the camshaft in relation to the gear.
• BMW Double VANOS - Continuously varies the timing of the intake and exhaust valves.
• Ford Variable Cam Timing - Varies valve timing by rotating the camshaft.
• DaimlerChrysler - Varies valve timing thought the use of concentric camshafts developed by Mechadyne enabling dual-independent inlet/exhaust valve adjustment on the 2008 Dodge Viper.
• GM VVT - Varies valve timing continuously throughout the RPM range for both intake and exhaust for improved performance in both overhead valve and overhead cam engine applications.(See also Northstar System).
• GM DCVCP (Double Continuous Variable Cam Phasing) - Varies timing with hydraulic vane type phaser (see also Ecotec LE5).
• Holden Alloytec - Continuously variable camshaft phasing for inlet cams. Continuously variable camshaft phasing for inlet cams and exhaust cams (High Output Alloytec).
• Honda VTEC - Varies duration, timing and lift by switching between two different sets of cam lobes.
• Honda i-VTEC - In high-output DOHC 4 cylinder engines the i-VTEC system adds continuous intake cam phasing (timing) to traditional VTEC. In economy oriented SOHC and DOHC 4 cylinder engines the i-VTEC system increases engine efficiency by delaying the closure of the intake valves under certain conditions and by using an electronically controlled throttle valve to reduce pumping loss. In SOHC V6 engines the i-VTEC system is used to provide Variable Cylinder Management which deactivates one bank of 3 cylinders during low demand operation.
• Honda VTEC-E - Unlike most VTEC systems VTEC-E is not a cam switching system, instead it uses the VTEC mechanism to allow for a lean intake charge to be used by closing one intake valve under certain conditions.
• Hyundai MPI CVVT - Varies power, torque, exhaust system, and engine response.
• Kawasaki - Varies position of cam by changing oil pressure thereby advancing and retarding the valve timing, 2008 Concours 14.
• Lexus VVT-iE - Continuously varies the intake camshaft timing using an electric actuator.
• Mazda S-VT - Varies timing by rotating the camshaft.
• Mitsubishi MIVEC - Continuously varies valve timing, duration and lift by switching between two different sets of cam lobes.
• Nissan N-VCT - Varies the rotation of the cam(s) only, does not alter lift or duration of the valves.
• Nissan VVL - Varies timing, duration, and lift of the intake and exhaust valves by using two different sets of cam lobes.
• Nissan VVT introduced with the HR15DE HR16DE MR18DE MR20DE new engines in September 2004 on the Nissan Tiida and north american version named Nissan Versa (in 2007); and finally the Nissan Sentra (in 2007).
• Porsche VarioCam - Varies intake timing by adjusting tension of a cam chain.
• Porsche VarioCam Plus - Varies intake valve timing by rotating the cam in relation to the cam sprocket as well as duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
• Proton Campro CPS - Still under development, said to be based on Lotus technology which developed Porsche's VarioCam.
• PSA Peugeot Citroën CVVT - Continuous variable valve timing.
• Renault Clio 182, Clio Cup and Clio V6 Mk2 VVT - variable valve timing.
• Rover VVC - Varies timing with an eccentric disc.
• Suzuki - VVT - Suzuki M engine
• Subaru AVCS - Varies timing (phase) with hydraulic pressure, used on turbocharged and six-cylinder Subaru engines.
• Subaru AVLS - Varies duration, timing and lift by switching between two different sets of cam lobes (similar to Honda VTEC). Used by non-turbocharged Subaru engines.
• Toyota VVT - Toyota 4A-GE 20-Valve engine introduced VVT in the 1992 Corolla GT-versions.
• Toyota VVT-i - Continuously varies the timing of the intake camshaft, or both the intake and exhaust camshafts (depending on application).
• Toyota VVTL-i - Continuously varies the timing of the intake valves. Varies duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
• Volkswagen - VVT introduced with the 1.8T engine. The intake timing intentionally runs advanced and a retard point is calculated by the ECU. A hydraulic tensioner retards the intake timing.
• Volvo - VVT
• Yamaha - VCT (Variable Cam Timing) Varies position of cam thereby advancing and retarding the valve timing.

Alfa Romeo is an Italian automobile manufacturing company, founded as Darracq Italiana by Cavaliere Ugo Stella, an aristocrat from Milan in partnership with the French automobile firm of Alexandre Darracq. ... The Alfa Romeo Twin Spark (TS) technology was originally developed by Alfa in the early 1960s in their race cars (GTA, TZ) to enable it to achieve a higher power output from its engines. ... BMW, or Bayerische Motoren Werke, is an independent German company and manufacturer of automobiles and motorcycles. ... Also see: Variable Valve Timing, VTEC, VVT-i, VANOS This BMW innovation is the first production Variable Valve Timing system to offer continuously variable timing (on both intake and exhaust camshafts) along with continuously variable intake valve lift, on the intake camshaft only. ... BMW, or Bayerische Motoren Werke, is an independent German company and manufacturer of automobiles and motorcycles. ... This does not adequately cite its references or sources. ... Computer animation of a camshaft The camshaft is an apparatus often used in piston engines to operate poppet valves. ... BMW, or Bayerische Motoren Werke, is an independent German company and manufacturer of automobiles and motorcycles. ... This does not adequately cite its references or sources. ... Ford Motor Company is an American multinational corporation and the worlds third largest automaker after General Motors and Toyota, based on worldwide vehicle sales. ... RH side VCT Oil Control Solenoid and harness from a Ford 4. ... DaimlerChrysler AG (ISIN: DE0007100000) is a German car corporation and the worlds fifth largest car manufacturer. ... Wikipedia does not have an article with this exact name. ... General Motors Corporation (NYSE: GM), also known as GM, is an American automobile maker with worldwide operations and brands including Buick, Cadillac, Chevrolet, GMC, Holden, Hummer, Opel, Pontiac, Saturn, Saab and Vauxhall. ... A pushrod engine or overhead valve (OHV) engine is a type of piston engine that places the camshaft below the pistons (usually beside and slightly above the crankshaft in a straight engine or directly above the crankshaft in the V of a V engine) and uses pushrods or rods to... Overhead cam (OHC) piston engines place the camshaft above the cylinder heads and drive the valves or lifters directly instead of using pushrods. ... The Northstar System was Cadillacs trademarked name for a package of automobile performance features. ... General Motors Corporation (NYSE: GM), also known as GM, is an American automobile maker with worldwide operations and brands including Buick, Cadillac, Chevrolet, GMC, Holden, Hummer, Opel, Pontiac, Saturn, Saab and Vauxhall. ... The Family 1 is a straight-4 piston engine that was developed by Opel Powertrain, a subsidary of Adam Opel A.G. to replace low-displacement versions of GM Family II engine for use on subcompact cars from Opel/Vauxhall. ... Hydraulics is a branch of science and engineering concerned with the use of liquids to perform mechanical tasks. ... The Family II is a straight-4 piston engine that was originally developed by Opel in late 1970s for use in the Opel Ascona B and Opel Kadett D. Over time, the engine block has evolved to include many modern features such as DOHC and fuel injection. ... This article is about the Australian car manufacturer. ... The 3600 LY7 (and derivative LP1) are members of General Motors new High Feature (or HFV6) engine family of modern DOHC V6s. ... The logo of the Honda automobiles The logo of the Honda motorcycles Honda Motor Company, Limited )   (TYO: 7267 , NYSE: HMC), or simply called Honda, is a Japanese multinational corporation, engine manufacturer and engineering corporation. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... In telecommunication, the term lobe has the following meanings: An identifiable segment of an antenna radiation pattern. ... The logo of the Honda automobiles The logo of the Honda motorcycles Honda Motor Company, Limited )   (TYO: 7267 , NYSE: HMC), or simply called Honda, is a Japanese multinational corporation, engine manufacturer and engineering corporation. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... Overhead cam (OHC) piston engines place the camshaft above the cylinder heads and drive the valves or lifters directly instead of using pushrods. ... The straight-4 or inline-4 is an internal combustion engine with four cylinders aligned in one row. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... Overhead cam (OHC) piston engines place the camshaft above the cylinder heads and drive the valves or lifters directly instead of using pushrods. ... Overhead cam (OHC) piston engines place the camshaft above the cylinder heads and drive the valves or lifters directly instead of using pushrods. ... The straight-4 or inline-4 is an internal combustion engine with four cylinders aligned in one row. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... In short, Parasitic Loss is a loss that a parasite consumes from its host which may or may not be beneficial to the host. ... Overhead cam (OHC) piston engines place the camshaft above the cylinder heads and drive the valves or lifters directly instead of using pushrods. ... The Ford Essex V6 engine V6 and V-6 redirect here. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... Variable Cylinder Management (VCM) is Hondas term for a variable displacement technology. ... The logo of the Honda automobiles The logo of the Honda motorcycles Honda Motor Company, Limited )   (TYO: 7267 , NYSE: HMC), or simply called Honda, is a Japanese multinational corporation, engine manufacturer and engineering corporation. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... VTEC is an acronym for Variable Valve Timing and lift Electronic Control. ... The Hyundai Motor Group refers to a group of affiliated companies. ... Kawasaki can refer to: Kawasaki, Kanagawa - a Japanese city located between Tokyo and Yokohama Kawasaki Heavy Industries - a Japanese company producing transport-related equipment including motorcycles Kawasaki Kisen Kaisha - is a Japanese transport company whose main area of operations is international shipping Kawasaki, Fukuoka - a Japanese town in Fukuoka Prefecture... The ZG-1000 Kawasaki Concours (known in Europe as GTR1000) is a 1000cc, six speed, four cylinder, liquid cooled sport-touring motorcycle with a shaft drive. ... Lexus is the luxury vehicle division of Japanese automaker Toyota Motor Corporation. ... VVT-iE, or Variable Valve Timing - intelligent by Electric motor （電動連続可変バルブタイミング機構） is an automobile variable valve timing technology developed by Lexus. ... This article or section does not cite any references or sources. ... S-VT, or Sequential Valve Timing, is an automobile variable valve timing technology developed by Mazda. ... Computer animation of a camshaft The camshaft is an apparatus often used in piston engines to operate poppet valves. ... Mitsubishi Motors Corporation ) is the fifth largest automaker in Japan and the thirteenth largest in the world by unit sales. ... MIVECâ„¢ (Mitsubishi Innovative Valve timing Electronic Control system)[1] is the brand name of a variable valve timing engine technology developed by Mitsubishi Motors. ... Nissan Motor Co. ... Nissan Variable Cam Timing (commonly known as N-VCT or VCT or NVCS) is an automobile variable valve timing technology developed by Nissan. ... Nissan Motor Co. ... Nissan Ecology Orientated Varable Valve Lift and Timing (commonly known as VVL) is an automobile variable valve timing technology developed by Nissan. ... In telecommunication, the term lobe has the following meanings: An identifiable segment of an antenna radiation pattern. ... Nissan Motor Co. ... Variable valve timing, or VVT, is a generic term for an automobile piston engine technology. ... The Nissan Tiida is a compact car manufactured by Japanese automaker Nissan, replacing both the long-running Pulsar and the Sunny models as of September 30, 2004. ... Versa is the North American name for this vehicle, see Nissan Tiida for article The Nissan Versa is a new subcompact car from Nissan starting with the 2007 model year in North America. ... The Nissan Sentra is a small car made by automaker Nissan Motors and is generally a rebadged export version of the Japanese Nissan Sunny. ... This article is about the auto company. ... VarioCam is an automobile variable valve timing technology developed by Porsche. ... This article is about the auto company. ... VarioCam is an automobile variable valve timing technology developed by Porsche. ... Proton Holdings Berhad is the holding company for the Malaysian national carmaker Proton (Malay acronym for Perusahaan Otomobil Nasional, National Automobile Enterprise), which was established in 1983 under the direction of the former Prime Minister, Tun Mahathir Mohamad. ... The Campro engine in the Proton Gen. ... PSA Peugeot Citroën (PSA) is a vehicle company that owns the marques Peugeot and Citroën. ... MG Rover was the last British-owned mass-production car manufacturer in the British motor industry. ... VVC (Variable Valve Control) is an automobile variable valve timing technology developed by Rover. ... Suzuki Motor Corporation ) is a Japanese multinational corporation company producing a range of automobiles (especially Keicars and small SUVs), a full range of motorcycles, ATVs, outboard motors, wheelchairs, and a variety of other small combustion-powered engine products. ... The M family is a line of automobile engines from Suzuki. ... For other uses, see Subaru (disambiguation). ... Active Valve Control System (AVCS) is an automobile variable valve timing technology developed by Subaru. ... Hydraulics is a branch of science and engineering concerned with the use of liquids to perform mechanical tasks. ... For other uses, see Subaru (disambiguation). ... i-Active Valve Lift System (AVLS) is an automobile variable valve timing technology used by Subaru. ... This article is about the automaker. ... Variable valve timing, or VVT, is a generic term for an automobile piston engine technology. ... The A Series engines are a family of straight-4 internal combustion engines with displacement from 1. ... This article is about the automaker. ... VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota. ... This article is about the automaker. ... VVT-i, or Variable Valve Timing with Intelligence, is an automobile variable valve timing technology developed by Toyota. ... Volkswagen AG (ISIN: DE0007664005), or VW, is an automobile manufacturer based in Wolfsburg, Germany. ... Volvo Cars is the car maker using the Volvo Trademark. ... Yamaha may refer to: Yamaha Corporation – A manufacturer of a diverse range of musical instruments and electronics. ...

See also

• Camless engine technology
• Variable Length Intake Manifold
• Continuous variable valve timing

Most piston engines today employ a camshaft to operate poppet valves. ... Variable Length Intake Manifold (VLIM) is an automobile engine manifold technology. ... Continuous variable valve timing allows the intake and/or exhaust valve timing to be varied during engine operation. ...

References

External links

• Powre Haus Powre Valvz retrofit almost any engine
• Mechadyne International's information on the Dodge Viper VVT system
• Honda Technology Picture Book, VTEC
• Delphi Variable Cam Phasers (VCP)