underdrive pulleys?

[91whiteponygt]

my car was bought with underdrive pulleys supposedly on it, im not sure i wanna keep them, is there any way i can tell if they are not and what kind they are, seems my alternator, and fan are suffering. please give suggestions, maybe bad fan clutch.

 

[86bluecobra]

I guess the brand name should be on them somewhere. If you get a hold of a stock set you can compare the outside diameter of the pulleys to eachother.

 

[srothfuss]

Might beable to tell by the color of the pulleys? I bought BBK steel pulleys and they came powerder coated black to match the stock pieces.

You are running a clutch type fan? What kind of issues are you having? How about the alternator, is that still a stock unit or upgraded?

 

[91whiteponygt]

running stock fan but car seems to get hot(200-220) when it idles or stop and go driving, just want to get a little more power out of stock alternator just installed 180 thermostat and cooled fine for first few weeks

 

[luckythirteen13]

if they are underdrives, the crank will be small and the water pump will be large