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| BDC |
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Bottom dead centre. This is the lowest position that the piston reaches in a cylinder when it changes from going down to begin its upward movement. At that moment the speed of the piston is zero and the volume in the cylinder at its maximum. In a complete four-stroke cycle two bottom dead centres are reached. One when the admission phase finishes and the other when the expansion phase ends.
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| Bearing |
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The piece on which shaft rotates and whose mission is to reduce the rotational friction. The connecting rod bearings or bed plate are those that ease the turn of the crankshaft stopping any overheating and any melting of the parts in contact with it. There are ball and roller bearings.
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| Bearing |
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A piece of very high quality steel. made up of an external track and another interior. In the middle there are steel balls that rotate when one or the two trackss move. Their function is to minimize the friction during rotation.
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