My Dads tried telling me loads of times but I really don’t understand them.
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The transmission connects an engine’s crankshaft to the car’s wheels. The speeds at which the engine and wheels spin are directly proportional, and are measured as a ratio of how many crankshaft revolutions produce a single wheel revolution.
As the car accelerates, both wheel and engine speed increase together. Eventually the engine reaches the upper limit of its speed range. If the car is to move faster without damaging the engine, then the ratio of engine revolutions to wheel revolutions must decrease.
The transmission does this by changing to a different gear. The higher the gear, the slower the engine turns as compared to the wheels.
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