Side or rear radiator diesel pusher

moisheh wrote:
Ray Chez: You make some interesting comparisons but missed on the HP used. A rear rad usually runs constantly. No variable speed. Thus it is using HP all he time. A side rad only draws HP when the fan is running. And the fan speed is variable.

That is very true moisheh, but as you know the fan will be idle only while standing still when you first start the engine. Once the coach starts rolling and the temperature rises to around 200 degrees the hydraulic fan will cut in at low speed. So then when you start climbing a long grade the temperature will rise to about 210 on most ISX Cummins engines and the fan goes into high spin, your fuel mpg will drop from 7mpg to 4.5mpg. The hydraulic fan in the mean time will take considerable hp away from the engine causing the engine temperature to rise on those long grades. A lot more then a belt driven fan.

Another thing that I used to hate about side radiator fans is that every time one would come into the Morgan Hill Thousand trail Resort they would stir up a dust storm with the fan blowing the air onto the engine and then down into the ground. Most RVers hated to see one come in especially after they had just washed their coaches. LOL