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| | 2.972 How a Manual Transmission Works |
 | | A transmission lets the driver select the ratio between the engine and wheels, so the engine can be run at speeds that provide more power, or at speeds that may be less powerful but allow the engine to operate more efficiently. |
 | | The input shaft is connected to the engine via the clutch, such that when the clutch is engaged, power goes straight from the engine to the input shaft of the transmission, and the crankshaft and input shaft rotate at the same speed. |
 | | Just inside the housing of the transmission, the input shaft is connected to the countershaft (also known as the layshaft), by gears on both shafts, such that whenever the input shaft turns, so does the countershaft, and always at a fixed speed ratio. |
| web.mit.edu /2.972/www/reports/manual_transmission/manual_transmission.html (808 words) |
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