Originally Posted by Bamboozle
So I am about to embark on the change from my hydraulic fan to an electric i was wondering what where the difficulties you had in the process...Also what is the best type of fan will a Taurus fan really work? Any info is greatly appreciated.
Just bear in mind that it would have been a lot cheaper for Gillig to have installed electric fan(s) at the factory instead of a hydraulic system - there's probably good reason they went hydraulic. The general concensus on other bus conversion forums is that electric fans can never duplicate the CFM and cooling ability of a well-designed hydraulic or mechanical system, and folk who put electric fans in their rear-engine buses always have problems later with overheating, especially when climbing hills in hot weather. Good hydraulic systems have a temperature switch that controls a solenoid to restrict hydraulic fluid flow at lower temperatures - this will greatly reduce the power requirement at lower temps. How is the rest of your cooling system - is it in good condition overall?
FYI, I'm now in the process of completely replacing my entire cooling system because I've had steadily-worsening overheating problems since I bought my bus. I had Atlas Radiator in Santa Fe Springs CA make a new core that has 10% larger surface area than the old one, and it has 6 rows of closely-spaced dimpled tubes and a high fin count. Multi-Wing is making me a new 9-blade adjustable-pitch high-efficiency fan to replace the clunky old 6-blade metal fan that looks like it came out of a Model T. QCC is making me another Webster YC hydraulic gear motor to drive the fan. I'm also going to buy a Derale 65k BTU transmission fluid cooler to remove heat from the engine coolant - folk who've done this say it lowers coolant temps by a few degrees. All new thermostats/seals/gaskets as well, and new Alarmstat and Low Coolant switches also. My coolant tested OK, so it should be good for a few more years - a new coolant filter will take care of it. Yes, it's a lot of work to do all this, but I don't want to Band-Aid things. A cracked head is much more expensive than what I'm doing now!
At least for Detroit 2-strokes, it takes up to 40 HP to drive the fan. There's simply no way that any electric fans can equal the CFM of the stock hydraulic or mechanical system. Maybe folk with 4-stroke engines can get away with electric systems, but I cannot!