09-24-2017, 05:34 PM
Electric fans can be more fuel efficient if they operate only when needed and move only the amount of air needed.
It is easier to control the speed of an electric fan than the speed of a clutch fan.
I have often wondered why you couldn't drive a side mounted radiator fan with a belt and direction change pulleys. The fan wouldn't be moving with the engine, so the shroud clearances could be really close to improve the efficiency. . . . .
My '87 coach came with a thick stack of tech talk bulletins. I remember one of them was from Newell & said that their testing showed the rear radiator cooled better than the side mount.
Also saw that as Newell designed it, a properly functioning cooling system had a steady state temp rise above ambient of 125F when the 8V92 was making full power.
It is easier to control the speed of an electric fan than the speed of a clutch fan.
I have often wondered why you couldn't drive a side mounted radiator fan with a belt and direction change pulleys. The fan wouldn't be moving with the engine, so the shroud clearances could be really close to improve the efficiency. . . . .
My '87 coach came with a thick stack of tech talk bulletins. I remember one of them was from Newell & said that their testing showed the rear radiator cooled better than the side mount.
Also saw that as Newell designed it, a properly functioning cooling system had a steady state temp rise above ambient of 125F when the 8V92 was making full power.
1987 classic #159
8V92 MUI , Allison 740