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Pulley sizes and weights

Do smaller or/and lighter pulleys make a difference

Pulley sizes and weights

Postby mlopez [OP] » Mar 03 2021, 4:29am

I've been doing some research and from what I can understand, when it comes to changing pulley sizes you can have some negative effects to your accessories. If you have a smaller crank pulley it will turn your accessories slower, and can make your truck over heat, a/c blow not as cold, and alt not work as well, all this at lower rpms. So it seems that some companies sell sets of 3 pulleys so that your accessories still work the same. Keeping the ratios the same as stock is what helps run more smoothly. My truck is my daily I am just looking for some mods worth doing that are not too expensive. Under or at $600

My questions are: if you are keeping the ratios the same just with smaller pulleys, is there any benefit?
If there is a benefit to having smaller pulleys, what is it?
Is the benefit worth what most of these pulley sets cost?
Is it more beneficial to have pulley the same size just lighter?
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Re: Pulley sizes and weights

Postby roorancher » Mar 03 2021, 6:00am

And you want to do this because? Pulley sizes are specifically engineered for the engine and the accessory.

I don't think there's anyone on this site that's done this with a stock truck. Do you have $600 burning a hole in your pocket?
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Re: Pulley sizes and weights

Postby Bradley21sanders » Mar 03 2021, 2:22pm

performance wise, you change pulleys on superchargers. There is no need to change any of the pulleys on a stock non forced induction engine.

You would be better off with a tune (under 600).. over 600 Long tube headers or a cam.
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Re: Pulley sizes and weights

Postby tsuintx » Mar 03 2021, 2:28pm

What mods do you already have? If not everything from intake to exhaust to tune to suspension, I'd also suggest to spend your $600 somewhere else.
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Re: Pulley sizes and weights

Postby shakenfake » Mar 03 2021, 7:03pm

I assume you are talking about a UD pulley and an OD pulley. The UD from what I understand actually is worth about 10 HP. Now for $200 or whatever it certainly is not worth that, I guess depends who you talk to though.

Yes you can do a under drive pulley and it should not completely kill your accessories but it will probably make AC a little weaker.
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