Accessory Belt Speed?

[K24A4]

I have a simple question. Does the accessory belt increase in speed as the engine increases in RPM? I know everything is driven by the crank pulley…so for example, does the water pump, pump faster at higher RPM than low RPM?

Thanks.

Topic

[techhotline7]

yes it will pump faster as rpm increases. Its spins at a ratio of the crankshaft speed. There is an equation for it used for diagnosing noise, vibration, and harshness issues.

It is…

diameter of accessory pulley (divided by) diameter of crankshaft pulley. (there may be more but this is off the top of my head, i can look it up if you are interested)

crankshaft = 1 so ratio would be the answer to that equation :to 1

hope this helps, what is you overall goal to the question?

[John B Kobberstad]

Yes, it’s driven by the engine. The engine turns faster so must the belt. The belt turns faster so must the water pump.

[K24A4]

Thats what I thought, thanks. I’m trying to diagnose a squeeky, chirping sound coming from under my hood. I changed the belt, and it didsnt help. I’m thinking its AC compressor related.

[Author]

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