True, but I don't want to blow anything up on the rare occasions when I wind it up to 7000 (crank) rpm, either. It doesn't idle all that efficiently with a [email protected] cam...
This is exactly why electric fans end up being more efficient. Because at idle you need to move more air but not necessarily as much water. And at 7k rpm if you’ve overdriven the fan so it cools well at idle you run the chance of cavitation on the pump.
And you’re losing a ton of horsepower spinning the fan at 7k when you’re moving at speed and don’t really need the airflow from the fan. Even with a clutch you’re spinning the fan at 30% or more when you don’t need it at all.
With electric fans you can get your maximum cfm at idle where you need it because you’re sitting still, and have the fans completely off when you’re spinning max rpms and moving at speed.
