optimum running temp?

[PKRWUD]

All fans need a shroud in order for them to work properly. Most electric fans have one built into their design, whereas mechanical ones have a shroud that mounts separately to the radiator. If you have removed your mechanical fan, you no longer need the original shroud. That being said, if it still runs too hot with electric fans, reinstall the shroud and a mechanical fan w/o a fan clutch. Drag will exist, but not that much, and the cooling ability will be at it's best.

A fuel injected engine is designed to run at over 200 degrees. Because of the ECM, and the system design, running it colder will result in damage. There is slightly more power available in all engines by running them colder because they run richer, but running richer cuts the engines life expectancy in half. It thins the oil, and ruins the bearings and cylinder walls, advancing wear and tear. It's your money, do with it whatever you like.



Take care,
-Chris