Gasket
Any thin, soft material, but usually made of cork, cardboard, asbestos or soft metal, installed between two metal surfaces to ensure a good seal. |
|
GDI
Gasoline Direct Injection supplies fuel directly to the inside of the cylinder.
A variety of air-fuel mixtures can be created according to changes in the fuel injection timing.
:: Click for detailed GDI information |
|
Gearbox
The device in the drivetrain consisting of an input shaft, a system of gears (used to multiply engine torque) and an output shaft. A manual transmission consists of a clutch assembly plus a gearbox; an automatic transmission generally consists of a torque converter plus a gearbox. |
|
Gearbox - 7G-TRONIC
Mercedes-Benz presents the world’s first seven-speed automatic transmission for passenger cars.
Fitted as standard in five eight-cylinder models from autumn 2003
Fuel saving of up to 0.6 litres per 100 kilometres
Even shorter acceleration times and quicker intermediate sprints
:: Click for detailed Gearbox - 7G-TRONIC information |
|
Gearbox - Automatic Transmission
An automatic transmission is much easier to drive than a Manual Transmission, because you don't have to use a Clutch pedal or gearshift lever. An automatic transmission does the work all by itself. The first automatic transmission appeared in 1939.
Automatic transmissions automatically change to higher and lower gears with changes in the car's speed and the load on the engine. These transmissions are also aware of how far down you have pushed the gas pedal, and shift accordingly.
:: Click for detailed Gearbox - Automatic Transmission information |
|
Gearbox - Automatic VS Manual
What is the difference between automatic and manual transmissions?
In a vehicle with manual transmission, the driver must manually shift from gear to gear. Each shift in gears signals a change in the ratio of wheel revolutions to turns of the engine. By changing gears, the driver keeps the engine at its optimal performance level in the varying conditions. The clutch pedal in a manual transmission disengages the gears in the transmission which allows the engine to continually spin even when the wheels don't, allowing the driver to shift gears without damaging the engine.
An automatic transmission vehicle contains neither a "gear box" as such, nor a clutch pedal. A planetary gearset automatically changes the gear ratios between the wheels and the engine to meet the optimal level of performance. Instead of a clutch, an automatic transmission contains a torque converter. When the engine speeds up, it feeds transmission fluid to the converter, which distributes more torque to the wheels.
:: Click for detailed Gearbox - Automatic VS Manual information |
|
Gearbox - Manual
From the most basic four-speed manual in a car from the '60s to the most high-tech six-speed in a car of today, the principles of a manual gearbox are the same. The driver must shift from gear to gear. Normally, a manual transmission bolts to a clutch housing (or bell housing) that, in turn, bolts to the back of the engine. If the vehicle has front-wheel drive, the transmission still attaches to the engine in a similar fashion but is usually referred to as a transaxle.
:: Click for detailed Gearbox - Manual information |
|
Gearbox - SMG II
Available only on the M3 (at the time of writing), SMG II is a clutchless manual gearbox drawing on BMW's William F1 transmission technology. With 11 separate programmes which can be operated by two paddles behind the steering wheel, by the traditional gear selector, or a mixture of both, it can also be driven in self-selecting mode where the gear changes take place automatically.
The Sequential Manual Gearbox, aka Sequential M Gearbox, Tiptronic. This is not an automatic, and its not a manual. It's a sort of mix between the two. There's no torque converter ( like an Automatic ), yet the driver can opt to have the onboard computers change gears for them. The clutch is also no longer required in this type of gearbox since the SMG-II computes the information, all gear changes are made via hydraulics which are electronically controlled.
:: Click for detailed Gearbox - SMG II information |
|
|
Gear Shift Indicator
BMW gear shift indicator shows the ideal timing for each gear change on the vehicle's Info Display. By shifting gear at the recommended moment, driver ensures fuel is used more efficiently and emissions are minimised.
The digital engine management system monitors the driving situation and engine speed, and calculates which gear offers the most efficient performance. If for example a higher gear and lower engine speed would be more efficient, an arrow symbol and the recommended gear number appears on the Info Display between the tachometer and the speedometer.
:: Click for detailed Gear Shift Indicator information |
|
GRAV
Complete front-end made from lightweight aluminium including bonnet and front wings (fenders). |
|
