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Variable Valve Control
{{Use British English, date=June 2017 VVC (Variable Valve Control) is an automobile variable valve timing technology developed by Rover 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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, people instead of cargo, goods. The year 1886 is regarded as the birth year of the car, when German inventor Carl Benz patented his Benz Patent-Motorwagen. Cars became widely available during the 20th century. One of the first cars affordable by the masses was the 1908 Ford Model T, Model T, an American car manufactured by the Ford Motor Company. Cars were rapidly adopted in the US, where they replaced Draft animal, animal-drawn carriages and carts. In Europe and other parts of the world, demand for automobiles did not increase until after World War II. The car is considered an essential part of the Developed country, developed economy. Cars have controls for driving, parking, passenger comfort, and a variety of lights. Over the decades, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 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 many automotive manufacturers to use VVT systems. Two-stroke engines use a power valve system to get similar results to VVT. Background theory The valves within an internal combustion engine are used to control the flow of the intake and exhaust gases into and out of the combustion chamber. The timing, duration and lift of these valve events has a significant impact on engine performance. Without variable valve timing or variable valve lift, the valve timing is the same for all engine speeds and conditions, therefore compromises are neces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MG Rover Group
MG Rover Group was the last domestically owned mass-production car manufacturer in the British motor industry. The company was formed when BMW sold the car-making and engine manufacturing assets of the original Rover Group to the Phoenix Consortium in 2000. MG Rover went into administration in 2005 and its key assets were purchased by Nanjing Automobile Group, with Nanjing restarting MG sports car and sports saloon production in 2007. During that year Nanjing merged with SAIC Motor (the largest vehicle manufacturer in China). During 2009 the UK subsidiary was renamed MG Motor UK. The MG TF was manufactured at the former MG Rover Longbridge plant and sold within the UK from 2008 to 2010. In 2011 the first all new MG for 16 years (the MG 6) was launched in the UK (assembled at the Longbridge factory). During 2013 a supermini was added to the line up (the MG 3), this went on to help MG Motor become the fastest growing car manufacturer within the UK in 2014. The Rover brand, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 to 1980, the marque spent the 1980s being used to denote performance models from then parent Austin Rover Group, and was briefly seen on the MG RV8, a limited edition relaunch of the MG MGB which was sold between 1993 and 1995. The MG F was initially designed by Rover Group during the period it was owned by British Aerospace and was brought to market after the business had been sold to the German car manufacturer BMW. The BMW owned Rover Group manufactured the model from 1995 to 2000. BMW broke up Rover Group in 2000, divesting the Rover and MG passenger car businesses to a management buy-out who formed the independent MG Rover business. MG Rover manufactured the MG F from 2000 onwards, heavily updating it to become the MG TF in 2002. M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 and performance enhancements, such as updated sports suspension and a less baffled exhaust. Reception The MG ZR was one of Britain's most popular sporting hatchbacks throughout its production life, and in 2004, it was MG Rover's best selling car—the first time that any MG product had been the most popular product of any of the many combines that had owned the MG marque. Tens of thousands of MG ZRs were sold in Britain and proved particularly popular with young buyers who were attracted by deals such as free insurance and discounts that were the equivalent of VAT. The car was made until April 2005. While its handling was praised by reviewers, other aspects of the ZR were found to be inadequate. Performance The entry level ZR 105 came ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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-door saloon car based on the Honda Ballade. The second generation was available in three or five-door hatchback forms, as well a coupé and cabriolet (in relatively small numbers). Its sister model, the Honda Concerto was built on the same production line in Rover's Longbridge factory. The final generation was developed independently by Rover on the platform of its predecessor, and was available as a three or five-door hatchback. Just before BMW's sale of Rover in 2000, and following a facelift, the model was renamed and sold as the Rover 25, and the MG ZR was based on the Rover 25 with mechanical changes to the suspension. Production ceased in 2005 when MG Rover went into administration. Production rights and tooling for the model, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 chassis that provides a rigid platform for the suspension, while keeping weight and production costs to a minimum. It is capable of speeds up to . The Elise was named after Elisa Artioli, the granddaughter of Romano Artioli who was chairman of Lotus and Bugatti at the time of the car's launch. Production of the Elise, Exige and Evora ended in 2021, to be replaced by a new family of models. Series 1 The 1996 Lotus Elise weighed . Because of this low weight, it was able to accelerate 0- in 5.8 seconds despite its relatively low power output of . Braking and fuel consumption are also improved by the car's reduced weight. Cornering is helped by a low center of gravity height of 470 mm (18½"). Series 1 was designed by Julian Thomson, then ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. After Lotus ended production of the Lotus Seven, Caterham bought the rights to the design, and today make both kits and fully assembled cars. The modern Caterham Seven is based on the Series 3 Lotus Seven, though developed to the point that no part is the same as on the original Lotus. Various other manufacturers offer a sports car in a similar basic configuration, but Caterham owns various legal rights to the Lotus Seven design and name. The company has taken legal action in the past in order to protect those rights, although in South Africa, it lost its case against Birkin on the basis that it never obtained the claimed rights from Lotus. History Colin Chapman had been a Royal Air Force pilot, studied structural engineering, and went on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 styling. The original car was announced at the 1994 British Motor Show to celebrate 21 years of Caterham Cars’ manufacture of the Lotus Seven. Styled by Iain Robertson and developed by a team under Jez Coates, the aim was to have a car that offered "the chance to experience Caterham motoring in a more practical format". The 21 was offered with a range of four-cylinder engines from 1.6 to 2.0 L, with . Caterham originally intended to produce 200 cars per year, but in fact only 40 to 50 examples were actually made before the project was quietly shelved in 1999. Design and specification Being almost mechanically identical to the Caterham 7, the 21 was set apart by the design of the body. Inspiration was drawn from the design of the Lotus El ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. Conceived as a lightweight sportscar, it uses no subframes for its suspension with all the mountings being bolted straight to the GRP monocoque tub. At the front it uses unequal length wishbones of GTM design locating uprights from the Rover Metro/100 range and a forward mounted steering rack for extra legroom. The rear suspension is an unusual double trailing arm design, bolted to the rear bulkhead and using the same uprights as the front. The engine/transmission unit is held in a frame hanging off the rear bulkhead, a frame which also locates the rear hinging engine cover which incorporates a sizeable boot which can accommodate a full size set of golf clubs. The front 'clamshell' conceals the radiator, battery, master cylinders etc. and also ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 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 many automotive manufacturers to use VVT systems. Two-stroke engines use a power valve system to get similar results to VVT. Background theory The valves within an internal combustion engine are used to control the flow of the intake and exhaust gases into and out of the combustion chamber. The timing, duration and lift of these valve events has a significant impact on engine performance. Without variable valve timing or variable valve lift, the valve timing is the same for all engine speeds and conditions, therefore compromises are neces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 series was introduced in 1988 by Rover Group as a powerplant for the Rover 200 car. It was the second volume-production implementation of the low-pressure sand-casting (or LPS) technique in a new plant sited between East Works and Cofton Hackett. (The first volume application of the LPS process had been for the M-16 cylinder head, produced in South Works, adjacent to the former forge). The LPS process pumped liquid aluminium into a chemically-bonded sand mould from below. This reduced oxide inclusions and gave a casting yield of around 90%, compared with 60% for more conventional gravity casting processes. The process avoided many of the inherent problems of casting aluminium components and consequently permitted lower casting wall thickness ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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