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Tach for CUCV
The alternator tach signal is a roughly sine wave alternating current with frequency between 215 Hz at idle to 1239 Hz at 3600 RPM. The rotor of the 27 SI alternator has 16 poles, 8 North and 8 South. The crank pulley is 7.75 inches in diameter, the alternator pulley is 3 inches. This makes... -
Tach for CUCV
It is AC and the tachometer calculates crank speed by the frequency. You have to take into account the pulley (sheave) ratio. Alternators turn 1.5 to 3 times the crank speed. Or more on slower diesels. Usually want to keep the alternator under 10,000 RPM as frequencies above 200 Hz (12,000...