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- C4 ZR-1 General Postings (http://zr1.net/forum/forumdisplay.php?f=14)

- - Pulleys (http://zr1.net/forum/showthread.php?t=21589)

Quote:

Originally Posted by -=Jeff=- (Post 231072)

Dumb question, if someone wanted a WP and PS pulley then it is $199.00 X2 or 398.00 total right??

Yes sir, plus shipping but in your case no shipping i can hand them to you.:cheers:

Pete

okay, just checking, unfortunately I am not ready for those yet

Hi Pete,

I'd have seen this sooner (like, last time around) if it was in the FS section.

2 Qs if you will,

#1 how much weight are we talking about? I haven't had either of these off the car.

#2 how much underdrive on the WP, and will it still cool at idle on a hot day?

Thanks much, glad I saw this. I don't get by here like I used too (been busy).

Best,
- Jeff

Quote:

Originally Posted by batchman (Post 231089)

Stock Water Pump 28.3 oz
Aluminum WP 14.3 oz

Stock Power Steering 30.5 oz
Aluminum PS 20.5

The Water Pump Underdrive Pulley is 10%
I have not done real world test but there are a few ZR-1's out there with
the UD WP pulley's i haven't had any bad feedback.

Pete

I have Pete's P/S pulley, WP pulley, and Alternator under drive pulleys. They all work fine. I don't even suspect that they are on there.

Did someone have pictures?

I have a thought about under drive on the water pump. I know they cavitate at high speed, but at low speed is the pump moving enough water to cool the engine. Maybe over heating at low speed is not an air flow issue, but a water flow issue. If this goes anywhere, it may warrent a new thread. Sorry Pete, didn't mean to side track the thread.

Quote:

Originally Posted by efnfast (Post 231117)

I don't believe you "side-tracked" anything. I brought attention to the thread for a member who was looking for a PS pulley and suggested this thread to him to help in his search. It's revived some interest it seems to Pete's original post that was in 11/2013.

I'd think "all is well"..

The Water Pump Pulley and related Engine Cooling

Quote:

Originally Posted by efnfast (Post 231117)

I think it has been accepted that higher coolant temperatures in traffic and at slow speed is definitely an air flow (through the radiator) issue. I think it has also been accepted that Coolant Flow Water Pump Cavitation is definitely an issue at high engine rpms when the Water Pump is driven by the Serpentine Belt with stock Water Pump Pulley. If you are running continuously at high speed/high rpms you would not only want but need an under drive water pump pulley or other power source for your water pump. There are also several technical discussions related to Engine Coolant Flow Thermostat Selection.

There are existing threads including technical discussions of both situations and options (Air Flow through the radiator and water Pump Cavitation). The Air Flow discussions include options related to higher flow rate Cooling Fans. The Water Pump discussions include Under Drive Pulleys and electrical driven Water Pumps (driven by lower speed electrical motors vice the serpentine belt at very high engine rpms). Thermostat opening temperatures are also discussed as that relates to Engine Cooling.

Other issues discussed in these related threads include the Cooling Stack which consists of the Engine Cooling Radiator, Engine Oil Cooler, and ZR-1 Interior Cooling (AC Condenser). These related discussions also include the Engine Coolant Thermostat Options. There are several Aluminum Radiator Options that DO offer better engine Cooling in traffic at slow speeds or when idling at stop lights.

I can find the various threads and technical discussions related to Engine Cooling and post here as desired. ;)

Soooo Cliff, how do the guys with electric water pumps do in traffic. Electric pumps are not engine speed dependent.