How do I know what size pulley I need for my alternator?

How do I know what size pulley I need for my alternator?

In order to get your pulley ratio you would measure the diameter of your crankshaft pulley and divide it by the diameter of the alternator pulley you will be using. For example, if your crankshaft pulley is 6” in diameter and the alternator pulley is 2” in diameter, the ratio would be 3:1 or 6 ÷ 2 = 3.

Does pulley size matter on alternator?

Using a smaller pulley will speed the rotor up, and the alternator will produce more power. This won’t effect the ECM or anything else in the vehicle, since top voltage will still be regulated.

What is alternator pulley ratio?

The pulley ratio is the ratio between the outer diameters of the engine drive pulley and the alternator pulley.

Are alternator pulleys interchangeable?

Use the proper alternator pulley type for the specific vehicle: solid pulleys, one-way clutches and overrunning alternator decouplers are not interchangeable. So it is vital that the new alternator pulley is the same type of pulley that was installed by the vehicle manufacturer as original equipment.

How do I choose a pulley?

Place your pulley face down on a flat surface, then put your ruler or caliper on top, measure from outside edge to outside edge across the circle of the pulley. Check carefully to make sure you are measuring across the center.

What is the purpose of V pulley in charging system?

The alternator pulley allows the V-shape or serpentine belt to spin the alternator and is driven by the engine’s accessory drive system.

How does pulley size affect speed?

By changing the diameter of the pulley wheels, speed can be changed. A smaller pulley turning a larger pulley results in the larger one moving more slowly but with more shaft power.

How do I know what size pulley I need for my electric motor?

There are complicated formulas for determining pulley ratios but in generic, layman terms, simply divide the driven component (pump) by RPM, the driver component (motor or engine) rated by RPM to get the required ratio. In the example below, the pump RPM is 1070, for full output, while the motor is 1750 RPM.

Will a bigger alternator hurt my car?

You can never have too much amperage when it comes to alternators; therefore, you never have to worry about choosing an alternator with too high of a rated output. So high-output alternators will not harm your components or charging system, no matter how high you go with the amps.

How much does it cost to replace alternator pulley?

There is an average cost for a drive belt idler pulley replacement. Labor costs are between 64 and $81 while parts are between $79 and $83. Taxes and fees are not included in the estimate.

Does the size of a pulley matter?

A larger diameter pulley wheel (aka sheave) is technically more efficient than a smaller diameter pulley. But it’s a trade off: a larger pulley has increased bulk, weight and cost. For example, in a 1:1 haul, you gain about 7% efficiency going from a 1.5” pulley to a 3.75” pulley.