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(The correct pulley ratio is very important for correct alternator performance |
| 1. | A pulley ratio of 3 to 1 is preferred, or a ratio as close to 3 to 1 as possible. It is recommended not to use a ratio less than 2.5 to 1. |
| 2: | To find the pulley ratio: Measure the diameter of the crankshaft pulley (or the pulley driving the alternator) and the diameter of the alternator pulley.
Note: Measure V belt pulleys on total outside diameter. Measure serpentine belt pulleys across the top of the grooves the belt rides on. |
| 3. | Divide the diameter of the crankshaft pulley by the diameter of the alternator pulley. This will give you the pulley ratio. |
| 4. | The power curves show alternator RPM . You must multiply engine RPM by the ratio to get alternator speed. |
| Series 23 Pulleys | Series 24 Pulleys | Series 25 Pulleys |
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