[jeffy]

I will ask all of you that say slow, how does the water pump in you car flow vs. engine load operation?

The water pump flow volume increases with engine RPM's of course.  The thermostat may close a bit to throttle the flow if it gets too cold.  If the radiator gets clogged then it shows up first by the engine running hotter at highway speeds.  I imagine this is because there is less cooling area available as the radiator gets clogged rather than the flow being impeded.  Does that sound right?

[Jimmy K]

I will ask all of you that say slow, how does the water pump in you car flow vs. engine load operation?

The water pump flow volume increases with engine RPM's of course.  The thermostat may close a bit to throttle the flow if it gets too cold.  If the radiator gets clogged then it shows up first by the engine running hotter at highway speeds.  I imagine this is because there is less cooling area available as the radiator gets clogged rather than the flow being impeded.  Does that sound right?

I'm confused. Where do you put the hops?

[klickitat jim]

I don't know but I knew a kid with a hopped up engine.

[hopfenundmalz]

I will ask all of you that say slow, how does the water pump in you car flow vs. engine load operation?

The water pump flow volume increases with engine RPM's of course.  The thermostat may close a bit to throttle the flow if it gets too cold.  If the radiator gets clogged then it shows up first by the engine running hotter at highway speeds.  I imagine this is because there is less cooling area available as the radiator gets clogged rather than the flow being impeded.  Does that sound right?

Correct Jeff. The pump output is low at idle, rises in a parabolic curve with RPM, as the max heat is generated at max power, which is at high RPM.

When working in Germany I learned that the Autobahn was not the worst case design case, it was easy due to the high flow of air through the radiator. Worst case was pulling a trailer on a hot day up a pass in the Alps. High heat generation, low flow of warm thin air. Made perfect sense. That coolant - air - has to carry the heat away.

[69franx]

Thanks for all the responses everyone. I guess I will go faster to cool faster, and find a purpose for the water. I also really like what I have seen elsewhere on here about cooling to a specific point, say 80, and letting stand overnight for a pitch the next day after finishing cooling in a cold basement, etc. I guess I knew the answer was faster cools faster, just got caught up in the trap of not realizing that it was the colder ground water (larger delta) that was making the difference, I thought it was changing the speed of flow. Thanks again and good brewing to all!

[kramerog]

IIRC faster is good until you have 100F or so, at which time you should slow it down for a chance for more heat exchange.

+ 1.  Fast is good initially in part because it helps induce natural convection in the wort.