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Planetary Gears

As your vehicle reaches higher speeds, it needs less torque to keep the car going. Transmissions can increase or decrease the amount of torque sent to the car’s wheels thanks to gear ratios. The lower a gear ratio is, the more torque is delivered. The higher a gear ratio is, the less torque is delivered. On a manual transmission, you have to move your gear shift to change the gear ratios. On an automatic transmission, gear ratios increase and decrease automatically. And this is able to happen thanks to the ingenious design of a planetary gear. A planetary gear consists of three components: A sun gear.  Sits at the center of the planetary gear set. The planet gears/pinions and their carrier.  Three or four smaller gears that surround the sun gear and are in constant mesh with the sun gear. The planet gears (or pinions) are mounted and supported by the carrier. Each one of the planet gears spins on their own separate shafts that are connected to the carrier. Planet g...

Automatic Transmission

Purpose of a Transmission Before we get into the ins and outs of how an automatic transmission works, let’s do a quick review of why vehicles need a transmission  of any kind  in the first place. As discussed in our primer on how a car engine works, the engine of your vehicle creates rotational power. To move the car, we need to transfer that rotational power to the wheels. That’s what the car’s drive train which the transmission is a part of  does. But here’s the problem: an engine can only spin within a certain speed in order to operate efficiently. If it spins too low, you wouldn’t be able to get the car moving from a standstill; if it spins too fast, the engine can self-destruct. What we need is some way to multiply the power produced by the engine when it’s needed (starting from a standstill, going up a hill, etc.), but also decrease the amount of power sent from the engine when it isn’t needed (going downhill, going really fast, slamming on the brakes). ...

Goodwood Revival

In 1961, celebrated American racer Dan Gurney shipped his own Chevrolet Impala SS to the UK to beat the Jaguars in the British Saloon Car Championship ( CBS ). His dominance in the Silver stone  race led to ruffled feathers and a rumored  ban. The car returns to the UK for the first time since 1961 at this year’s  Good wood Revival . “I will, in time,” the late Gurney wrote in  Auto sport , “get over the fact that I spent a lot of time and money in bringing the Impala to Great Britain, but I will not readily forget the suspicion that there may have been some behind-the-scenes sabotage to prevent the Chevrolet from running at Silver stone.” The great American racer Gurney didn’t pull any punches, aimed at the British Jaguar teams, after he mysteriously couldn’t enter his Chevrolet Impala SS for a second time in the 1961 British Saloon Car Championship. Asked many years later why he didn’t protest more, he replied simply, “Why fight City Hall?” At the star...