[Nolowrider]

While trying to correct a pulley alignment issue I replaced the chrome (after market) water pump pulley with the factory stock pulley. I noticed tonight that whlie sitting at a stop light that my temp creeped from 180* to about 210*. So my question is, does a smaller diameter pulley turn the water pump faster or slower? The stock pulley appears to be smaller in diameter than the chrome one. The only thing I changed was the pulley. Guess I will put the chrome one back on and see what happends.

 

[Stikman33]

Smaller diameter turns it faster providing the belt is still moving the same speed.

 

[Nolowrider]

Smaller diameter turns it faster providing the belt is still moving the same speed.

Thank you for the reply.

So, why would my temp rise with changing to smaller diameter pulley, if the pump is running faster?

 

[swcash]

Check that the belt is tight enough and not slipping.
Squido

 

[Guest]

?????????

And I have to add that we really need to stick to stock pulley diameters to keep us out of trouble unless you want to pull the T-Stat and experiment w/ a sized washer hole and a needle tipped choke-bolt.

Back when I had my old junk301 in my 1st Gen Car, years ago, I kept throwing my belt up above 7,000 rpm and I later found out that it was b/c my alt. was in the process of eating the front bearing. Got it fixed fine.

But I do want to say that I could run home 20 miles w/ no belt b/c the air coming through my rad kept spinning my fan and thus kept turning my w/p just enough that I didn't boil over......

pdq67

Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

 

[Nolowrider]

Thank you to everyone that responded. My BB has always stayed at 180*, even on the hottest summer days. While sitting at the light she creeped up to 210*, then as soon as I started rolling she came back to to 180*. Never did that before, so I thought it was the stock pulley. I put the chrome one back on today and I will run her tomorrow and see what happends. Thanks again for the advice.