Reply to "Coolant tubes under the car"

...Here's another one for debate.

IN MY OPINION:

Be advised, that if One is increasing the Diameter of the 'Tubes' to increase coolant Flow, the Definitive Restriction to the Cooling System Flow, is the Thermostat, Itself. As the 'High Flow' Robertshaw Stats 'Only' Open as far as:

180F = .260" (1/4")
195F = .130" (1/8")
'Curtain' Diameter 1.520"
Do the Multiplication and come up with the Maximum 'Curtain Area', to calculate the Flow Potential.

The Minimal Opening of the 195F, is the method of Raising the Operating Temperature of the Cooling System, Over the 180F.

We must keep in Mind, the 'Rating' of these Stats is NOT the Temp at which the Stat STARTS to OPEN!
The Rating IS the Temperature at which the Entire Cooling System is Brought-Up To, and Sustained At. And Then, there are All the Other Factors we know of, that effect the Efficiency of the Cooling System. We also know That List is Long!

Last, The 4.90" 'Over-Drive' Waterpump Pulley, WORKS! Yes, it Increases Flow, Within the Pump! Still, there is the Restriction at the Thermostat, by the Laws of Hydraulics, 'Restriction to Flow CREATES Pressure'.