Quote: Are there flow ratings available for the two water pumps? Why does it appear that the A/C pump would flow less than a non-A/C pump, I would think it would be the exact opposite need. I can see that the A/C pump would have less drag or resistance than the non-A/C pump and can understand that would be important because of the increased drag of the A/C system but why such a big difference? What is the flow rate difference between the two??
I read up on this a long time ago. If you move the coolant through the motor too fast, it does not allow the water/coolant adequate time to transfer the heat. Hemi's put out more heat and only have a 6 blade impeller just for that reason...to slow the flow down a little. I think Chrysler engineers also increased the diameter of the Hemi crank pulley and reduced the diameter of the water pump pulley from 68- 69 to try to get the optimum rpm's for the water pump? I believe 383/440 HP's and A/C equipped cars had 8 blade impellers. It's a little hard to understand. On the otherhand, I would be concerned about the backwards configuration of the impeller too? It just does not look right.
