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where does the speedometer cable connect to the transmission
The gear design of each type of automobile is different, and the size of the tire and the transmission ratio of the rear drive axle should be considered. For the output of most transmissions, driving the flexible shaft to rotate 1001 times is equivalent to one mile on the odometer. In other words, if driving the flexible shaft to rotate 1001 times per minute, it means driving a mile, and it is 60 mph (60 mph). Speed indication the speed indication of a typical speedometer or tachometer works according to the electromagnetic principle. Between the magnet and the basin stator is a speed disk of non-magnetic material mounted on the rotating shaft. The magnet rotates in the speed disk.The rotating magnetic field caused by the rotating magnet generates a force to drive the speed disk to rotate in the same direction, but the motion of the speed disk is stopped by the balance spring installed on the rotating shaft, and the speed disk just stops at the point where the magnetic force and the reaction force of the balance spring are balanced.
Any looseness and corrosion between the cable and clamp or between the clamp and the battery terminal will produce high resistance and voltage drop. The high resistance between the cable and the terminal can be easily measured with a voltmeter. Apply 20A current to it, connect one wire of the voltmeter to the cable and the other wire to the cable terminal. The voltage drop between them shall be 0.1V, and the voltage drop between the starting motor and the grounding wire shall not be higher than 0.1V.In order to transmit the high voltage to the spark plug with the minimum loss, the most basic problem is to select the correct high voltage cable. In addition, it must have an insulating layer that is heat-resistant, cold resistant, moisture-proof, oil and grease resistant, wear-resistant and corona resistant. Corona is an electrical phenomenon that is not easy to see, but it can quickly damage the rubber and establish an electric field around it through the high voltage in the cable. This electric field ionizes the surrounding oxygen and generates ozone.
If the rubber insulation layer is not properly protected, it will be eroded by ozone and lose its insulation. The loss of electric energy seriously weakens the spark in the spark plug gap. The high-quality ignition cable has the characteristics of corona resistance, heat resistance, cold resistance, oil resistance and moisture resistance.
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