Rover Gearbox: new and used SD1, 25 car gearboxes, P5, P6 models
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Rover CVT Gearboxes
CVT’s for Rover cars can smoothly compensate for changing vehicle speeds, allowing the engine speed to remain at its level of peak efficiency. They might also avoid torque converter losses. This improves both fuel economy and exhaust emissions. However, some units (e.g., Jatco “Extroid”) also employ a torque converter. Fuel efficiency advantages as high as 20% over four-speed automatics can be obtained.
The continuously variable transmission (CVT) is a transmission in which the ratio of the rotational speeds of two shafts, as the input shaft and output shaft of a vehicle or other machine, can be varied continuously within a given range, providing an infinite number of possible ratios.
An automatic transmission is an automobile gearbox that can change gear ratios automatically as the vehicle moves, thus freeing the driver from having to shift gears manually. (Similar but larger devices are also used for railroad locomotives.)
Comparisions to hydraulic automatic transmissions:
CVTs have much smoother operation. This can give a perception of low power, because many drivers expect a jerk when they begin to move the vehicle. The satisfying jerk of a non-CVT can be emulated by CVT control software though, eliminating this marketing problem.
Since the CVT keeps the engine turning at constant RPMs over a wide range of vehicle speeds, pressing on the accelerator pedal will make the car move faster but doesn’t change the sound coming from the engine as much as a conventional automatic transmission gear-shift. This confuses some drivers and, again, leads to a mistaken impression of a lack of power.
CVT torque handling capability is limited by the strength of their belt or chain, and by their ability to withstand friction wear between torque source and transmission medium for friction-driven CVTs. CVTs in production prior to 2005 are predominantly belt or chain driven and therefore typically limited to low powered cars and other light duty applications. More advanced IVT units using advanced lubricants, however, have been proven to support any amount of torque in production vehicles, including that used for buses, heavy trucks, and earth moving equipment.
Some Automobiles made the Rover Group
P3, P5, P6, SD1, 25, 75, 45, 400, 416i, 200, 100, 800, 600, CityRover, Estoura, Streetwise.