Do not confuse flow with pressure. Great flow does not promote better cooling. The coolant needs time to transfer heat to the air and it needs time to pick up heat from the engine. Take a look at this blog post from my website.
UPGRADED PERFORMANCE RACING RADIATORS. Think about standing outside with a wet shirt on at say, 40 degreesF. With no wind, you may feel cold but not as much as you do with even a slight breeze. What happened is that you released more heat with the air passing over your body like water would pass over the engine and through the radiator. This post may also be of help
Racing and Performance Water Pumps.
Thanks
Jean Genibrel
Appliedspeed.com
