Table of Contents
Does the pulley size on an alternator matter?
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.
Are all alternator pulleys the same size?
Pulleys must match the appropriate alternator as shown on the list of available pulleys. Alternator shaft sizes are not all identical so a pulley from one alternator may not be interchangeable with a pulley from another. These pulleys are also available separately for purchase , typically the cost is $60-100.
What is the pulley ratio in an alternator?
In general, pulley ratios of about 2:1 to 3:1 provide good charging system performance and assure longer service life of the alternator bearings.
How do you measure an alternator 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.
Can I change alternator pulley?
In many cases it is possible to remove and install the overrunning alternator pulley while the alternator is still on the engine. The plastic protective cap cannot be re-used after it has been removed from the pulley. A replacement cap is supplied with the new part.
What is overrunning alternator pulley?
The overrunning alternator pulley is a further development of the fixed belt pulley on the alternator. Thanks to its overrunning clutch, it damps the vibrations which are generated by cyclic irregularities in the crankshaft and also enables the engine speed to be reduced rapidly in the event of sudden load changes.
What is the purpose of a clutch pulley on an alternator?
Clutch pulleys, also known as one-way or decoupler pulleys, are designed to decouple the Alternator from the rotational forces of the engine crankshaft pulley and serpentine belt.
Is the bigger the pulley faster or slower?
Pulleys of Different or Same Size If a smaller pulley turns a larger one, the larger one will turn slower, but with more power available at the shaft. If a bigger pulley turns a smaller one, the smaller one will turn much faster than the bigger one but with less power available at the shaft.
Does alternator charge at idle?
Assuming the alternator, engine, belt, and battery are all in working order, then yes, a car battery will charge when idling. The only caveat is that it doesn’t really “charge” that fast. This is solely due to the fact that the engine doesn’t have a load on it when your car is simply idling.
Can a smaller alternator pulley help my idle?
Yes, you can increase your alternators overall output as well as increase power output at engine idle speeds. Check the size of the pulley on your alternator. If you are having problems with overall alternator output or charging at engine idle, maybe a smaller pulley is all you need.
What does a pulley on an alternator do?
The clutch pulley on an alternator allows the belt to turn freely in its own speed in one direction when the engine suddenly slows down. A properly functioning overrunning alternator pulley results in a smooth and quick running accessory belt system.
How to replace an alternator pulley?
Disconnect the Battery. First and most importantly: disconnect the battery.
Are the idler pulleys the same size?
no, not the timing belt. the serpentine belt. I’ve got a noise coming from one of the pulleys – it ended up not being from the idler or tensioner pulleys. although – the parts i ordered from rock auto are not the correct parts for an ’08 pilot idler and/or tensioner pulley – sizes are all wrong. these are the listed parts on rock auto that i purchased for idle and tensioner pulley: