Variable Valve Control
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{{Use British English, date=June 2017 VVC (Variable Valve Control) is an
automobile A car or automobile is a motor vehicle with Wheel, wheels. Most definitions of ''cars'' say that they run primarily on roads, Car seat, seat one to eight people, have four wheels, and mainly transport private transport#Personal transport, pe ...
variable valve timing 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 varia ...
technology developed by
Rover Rover may refer to: People * Constance Rover (1910–2005), English historian * Jolanda de Rover (born 1963), Dutch swimmer * Rover Thomas (c. 1920–1998), Indigenous Australian artist Places * Rover, Arkansas, US * Rover, Missouri, US * ...
and applied to some high performance variants of the company's K Series 1800cc engine.


About

In order to improve the optimisation of the valve timing for differing engine speeds and loads, the system is able to vary the timing and duration of the inlet valve opening. It achieves this by using a complex and finely machined mechanism to drive the inlet camshafts. This mechanism can accelerate and decelerate the rotational speed of the camshaft during different parts of its cycle. e.g. to produce longer opening duration, it slows the rotation during the valve open part of the cycle and speeds it up during the valve closed period. The system has the advantage that it is continuously variable rather than switching in at a set speed. Its disadvantage is the complexity of the system and corresponding price. Other systems will achieve similar results with less cost and simpler design (electronic control). For a more detailed description, see the sandsmuseum link below.


Applications


MG Rover cars

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MG F / MG TF The MG F and MG TF are mid-engined, rear wheel drive roadster cars that were sold under the MG marque by three manufacturers between 1995 and 2011. The MG F was the first new model designed as an MG since the MGB that was produced from 1962 ...
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MG ZR The MG ZR is an MG branded "hot hatch" version of the Rover 25 supermini class car, produced by MG Rover at their Longbridge plant in Birmingham from 2001 to 2005. Compared to the Rover 25, the ZR featured a number of styling modifications an ...
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Rover 200 / 25 The Rover 200 Series, and later the Rover 25, are a series of small family cars that were produced by British manufacturer Rover from 1984 until 2005. There have been three distinct generations of the Rover 200. The first generation was a four ...


Non MG/Rover cars

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Lotus Elise The Lotus Elise is a two-seat, rear-wheel drive, mid-engined roadster conceived in early 1994 and released in September 1996 by the British manufacturer Lotus Cars. The Elise has a fibreglass body shell atop its bonded extruded aluminium chassi ...
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Caterham 7 The Caterham 7 (or Caterham Seven) is a super-lightweight sports car produced by Caterham Cars in the United Kingdom. It is based on the Lotus Seven, a lightweight sports car sold in kit and factory-built form by Lotus Cars, from 1957 to 1972. A ...
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Caterham 21 The Caterham 21 is a two-seat roadster designed and hand built by Caterham Cars in the 1990s. It was based on the mechanicals of the Caterham 7 and was intended to be a more practical version of that car with more conventional sports car styli ...
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GTM Libra The Libra was launched by GTM Cars Ltd on the UK kitcar market in 1998. Three years in development it was a collaboration between GTM Cars directors Peter Beck & Paddy Fitch, designer Richard Oakes and suspension designer Bryn Davies. Conceive ...


See also

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Variable Valve Timing 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 varia ...
*
Rover K-Series engine The Rover K-series engine is a series of internal combustion engines built by Powertrain Ltd, a sister company of MG Rover. The engine was a straight-four cylinder built in two forms, SOHC and DOHC, ranging from . Design history The K ser ...


External links


How the MGF VVC really works

MG Rover Group

Powertrain Ltd, manufacturer of the VVC engines

Sandsmuseum
Engine technology Variable valve timing Rover Company