Water pump pulley

Bewy said
[1] Yes, the article in post #15 is wrong. It ignores a fundamental point: if the coolant stays in the rad longer [ to supposedly get rid of the heat ], then the coolant in the engine will gets hotter because it is a closed circuit. Now, hotter coolant enters the rad for cooling than would otherwise be the case.
[2] Many people who hardblock their blocks report cooler running. Since most of the coolant volume is in the block, a large proportion of coolant [ for cooling ] has been removed from circulation [ pardon the pun ]. So how can that be, less coolant, runs cooler? The remaining coolant circulates more quickly because there is less of it & cooling is improved.
[3] Using a 1" spacer & it runs cooler. The 1" is about the open area of an open thermostat. If you add up the area of the coolant holes in the head gasket, that area is greater than the stat area. So the stat regulates flow, not the gasket holes, but more importantly the restriction of the hole/stat creates a pressure build up in the coolant. Hot spots can form in the heads, & cause localised boiling [ nucleate boiling ]. Boiling water contains air bubbles, a poor conductor of heat. By building pressure in the system, the bubbles are suppressed & cooling is improved. They were pretty smart those factory engineers!
[4] Go to tech tips on this website. Started by Howard Stewart, who made the Stewart racing water pumps & built his own WP dyno.
www.stewartcomponents.com

Wonder why the outlets on the electric pumps are 1"? and also all the newer cars went to a smaller upper thermostat outlet.

When checking the cooling of the engine you are all thinking of the water temp . Did you ever think of comparing it to oil temp. I had a mechanical water temp, Oil Temp. and Trans temp side by side. I did compare them and slowing the water up lowered the engine temp. I also had engine oil temp with engine oil cooler temp.

We were trying this at a Nascar race shop to see what the temps were comparing them for street driving. Decreasing the hole in the stat improved cooling. I already had 1" hoses so I went as small as a 5/8 hole doing tests in 1/8 increments. watching oil water, and block temps with gauges and a laser thermometer . Cruising at 75 -80 MPH with a 5500 converter and 456 gears 28 inch tires

You all can tell me your engineering calculations and test on dyno's . We did this on the street recording all the data using equipment we know worked. I would trust these Nascar guys 100%. Tony Hirschman and Matt Hirschman. Super modified Troyer nascar shop. Tony Jr. works for Kyle Bush.

I could hammer on my car round after round shifting a 8500 and the temp never came off 190. Trans temp would always climb first.

I am not saying in certain combinations just scrambled together wouldn't benefit from slowing the water down. But it definitely worked for me. Believe me the cost for the work was not cheap due to the parts we were using at that shop. But the benefits paid off. Running Hot, boiling fuel, flare on the shift when hot. Now that we have it figured out the new motor will be bigger and more consistent in the new car.

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