Smaller water pump pulley?

[toofastforyou]

Does someone know if there is a SMALLER water pump pulley from another GM car with the right offset and bolt pattern that would fit on our cars? I would like to improve flow by spinning the pump a little faster...
Thanks. Claude.

 

[TurboRegal84]

Are you sure you want to change pully's?

Remember...The faster that the water pump spins the less time the water has to get cooled off in the radaitor...This might raise your coolent temp.


Are you having a cooling problem?

 

[toofastforyou]

Reply to TurboRegal84...

I feel my engine is running a little hot...(210 - 220 deg.). I thought that it might be worth trying spinning the water pump faster, and if it doesn't work, I can always put the stock pulley back on. Right now,I'm not running a thermostat, just a restrictor. Would it be better to remove the restrictor and see what happens before going through changing pulleys?
Thanks for your replies, 'bye, Claude.

 

[Carolinaturbot6]

What sort of restrictor are you talking about?

Kirban sells a 10% overdrive pulley & ATR sells a 5% overdrive one.

I don't know of a donor car that has a smaller pulley that will work. Maybe someone else does.

I do know that removing the thermostat will raise the temps because the coolant will flow through the radiator too fast & not allow it to cool properly. At least that is how I understand it.

 

[Dan Thompson]

How about a dual fan setup, a 160°, and a fan switch. Has the radiator been cleaned on the OUTSIDE? Get all the bugs and junk
off the outside.

 

[bruce]

Re: Reply to TurboRegal84...

Originally posted by toofastforyou
I feel my engine is running a little hot...(210 - 220 deg.). I thought that it might be worth trying spinning the water pump faster, and if it doesn't work, I can always put the stock pulley back on. Right now,I'm not running a thermostat, just a restrictor. Would it be better to remove the restrictor and see what happens before going through changing pulleys?
Thanks for your replies, 'bye, Claude.

I doubt you'll see much of a change at idle, and normal cruise speeds.
The smaller pullies are to increase the pump speed, and that in turn increases the working pressure in the block at higher RPM, and that min generating hot spots.
Were you careful in selecting the resistrictor?. Too large and the block won't get pressurised enough at high rpm.

Spinning the pump faster exposes more coolant to the radiator, and that allows for more cooling then a slow flow thru the radiator. All within normal limits, extremes of either and the system doesn't work.

I run a 5%, wasn't till this thread I saw there was a 10%, or I would have run that. But, that's just me.

 

[toofastforyou]

Carolinaturbo6, the restrictor I currently have is a stock thermostat housing, with the internal parts removed.I only kept the outer piece. As for the radiator, the car is still like new ( 8,000 km's) and it is as clean inside as outside. I also have a Casper's dual speed fan switch setup. Maybe some stuff like "water wetter" would help, but I don't know where to find it in my area...
I didn't know that Kirban made a 10% overdrive water pump pulley though...
As for finding a pulley from a donor car, maybe I should try the "Junkyard dogs" section!...
Thanks for your replies guys!...'Bye, Claude.

 

[bruce]

Originally posted by toofastforyou
Carolinaturbo6, the restrictor I currently have is a stock thermostat housing, with the internal parts removed.I only kept the outer piece.

I'd venture a guess you don't have enough of a restriction.
I've spent time with SBCs and using restristors. I would get to the size of one being too small and then add one 1/8 hole at a time till I got it right. If this is just a street car, use a 160dF thermostat and be done with it.

If you want the ulrimate in cooling from a thermostat point of view, then going to a recycling thermostat is the answer. BMW, and Fiat are two easy sources for them, but again you'd have to see what they actually flow.

 

[toofastforyou]

Question for bruce...

bruce, what is a "recycling" thermostat?...I would appreciate a little more info!...

Thanks, Claude.