Pistons are connected via rods (they're like your shins) to a crankshaft, and they move up and down to spin the engine's crankshaft, the same way your legs spin the bike's-which in turn powers the bike's drive wheel or car's drive wheels. Imagine riding a bicycle: Your legs move up and down to turn the pedals. And unless you are driving an ancient two-stroke Saab (which sounds like an old chain saw and belches oily smoke out its exhaust), your engine works on the same basic principles whether you're wheeling a Ford or a Ferrari.Įngines have pistons that move up and down inside metal tubes called cylinders. That torque is applied to the wheels to make the car move. Specifically, an internal-combustion engine is a heat engine in that it converts energy from the heat of burning gasoline into mechanical work, or torque.
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