L31MaxExpress
I'm Awesome
GM has newer PWM brushless fans in the Corvette and Camaro that are 600+ watts. IIRC the Camaro has an 18" fan that is 800 watts. Only fan I could see that might out perform the clutch fan by any metric at normal engine speeds. At say 2,500+ RPM the clutch fan is still going to move more airflow. There are some high end european vehicles using the same Spal motor and fan that also move a ton of airflow. GM has some newer 1500 trucks using a dual PWM motor setup even on the 6.2L although I have no idea on how many watts they draw or how much CFM they pull. That being said even that dual fan setup is obviously not enough to cool the 6.0L or 6.6L gas or diesel in the 2500+ trucks or vans because they still have a clutch fan in those applications. The 6.6L gas is using a HUGE clutch fan blade on it and in the vans even the 4.3L V6 has a fairly large clutch fan on it.
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