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2 different size pullies on one accessory?

Steve GMC

Steve GMC

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well this has me confused. the belt runs from the crank to the water pump which runs to the alt. the belt also runs from crank the to waterpump to the powersteering pump. now the pulley on the water pump has 2 differnt sized slots for the belt to run. like diameter is different from each. wouldnt this cause the belt to bind? or is it fine and im confused???

you can see in this pic a little bit what i mean. look at the water pump pulley

101_0261.jpg



thanks
 
:eek1:Man......(wiping the drool up now):haha::bow::bow::bow:

Thats nice man. Makes my 350 long block just ordered and put together look like a piss ant.

But to the question im running a water pump pully the same setup the front is larger then the back. So the ALT/water/crank run on one belt and the streering/water(small pulley) and crank. It dont sound right but i was told smaller pully on the water pump help the power streeing. but i been running for about 3 months and had no belt problems.But i dont have half the motor you do so....
 
alright thanks for the reply and the complements. i guess if you havent had a problem i wont either... we'll see when shes on the road
 
does your manual trans have a cover plate? half moon covering the cluth and the starter goes throught? If so what size bolt and tread does the cover plate take?
 
I built a truck back in late 80's that had the same pulleys on a smallblock that would eat belt's like candy. Figured out that the different diameter pulley was wrong. Changed it to a same size pulley and end of problem.
Yours didn't come as a set did they?
 
if both pulleys are different sizes and both belts run from the crank to the water pump then to different accessories it will forsurely bind. its like runing differnent gears in your front axle then your rear axle, they will just fight eachother. just think about it.
 
I was asking about his pulley's. I didn't have any problems with mine if I ran the belt's loose but if I tightened them up it wasn't long before I was at the part's store again.
 
K5 dude 350 said:
if both pulleys are different sizes and both belts run from the crank to the water pump then to different accessories it will forsurely bind. its like runing differnent gears in your front axle then your rear axle, they will just fight eachother. just think about it.
Click to expand...

I would agree but... the crank pulley is one size then the water pump front puly is a bit smaller but the alt pulley is even smaller. Then the crank pulley is one size and the back pulley on the water pump is another smaller size but the streering pump pulley is larger or possible same as crank pulley. so some how it works out. i actual had a better streering after i switched my pulley. also after running this odd setup my belts(tight) or in good shape and never had any heating problems or temp problems.

So i would agree with you if i wasnt driveing the setup on my DD.
 
I understand, The issue is the crank pulley looks to have the same diameter on both belt grooves then the water pump pulley has different size belt grooves giving different driven ratios when driven by the crank. The accessory that is being driven (ps,alt) are separate and can have differing pulley diameters. I have seen crank pulleys that have differing size grooves that must work with the water pump pulley in question.
 
bradshawtech said:
I understand, The issue is the crank pulley looks to have the same diameter on both belt grooves then the water pump pulley has different size belt grooves giving different driven ratios when driven by the crank. The accessory that is being driven (ps,alt) are separate and can have differing pulley diameters. I have seen crank pulleys that have differing size grooves that must work with the water pump pulley in question.
Click to expand...

Ok think im following you. all my pulley width are the same (grooves) so if that is different then there might be a problem?
 
You are going to run one belt from crank, water pump, alternator then the second belt will go from water pump to power steering pump. You cannot run 2 belts from the crank to water pump when the pulley diameters aren't the same on the water pump. I'm not sure when GM did the set-up as i described but i know it was like that in the early 70's at least in cars. Basically you're driving the water pump from the crank with one belt and the water pump is now the driving force for the P/S belt.
 
You can run that pulley BUT you have to run it like i explained on the post just above yours.
 
so if i run one belt from the waterpump to the ps pump... would that effect the waterpump at all like apply too much force to the bearing? couldnt i do the same directly off the crank?
 
It will work fine. Yes you could also do the same thing off the crank so long as the belt doesn't interfere with the water pump pulley. GM had some of the early stuff set up just like i described.
 
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