Pulleys

[Dynomite]

Originally Posted by efnfast

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.

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.