29-07-2019, 12:29 PM
(This post was last modified: 29-07-2019, 12:31 PM by Colin Morgan.)
Have now fitted a four blade fan on my otherwise standard Ruby - same diameter and blade shape as the original two blade. On a previous run with a two blade fan and no deflectors or baffles fitted to the radiator (side or bottom) the thermocouple in the top tank of the radiator gave a steady peak temperature of 95 degrees at 40 mph. Today, with the ambient temperature again at 21 degrees and with a similar light breeze, at 40 mph the temperature did not settle but fluctuated on the digital thermocouple readout between 92 and 94 degrees, occasionally straying to 90 or 95 degrees. On return and turning off the engine this settled at 93 degrees. So the conclusion from this run is that the four blade fan lowered the peak average water temperature by 2 degrees - not as much as I was expecting. However, it is perhaps more effective at slow speeds and when stopped in traffic?
Colin
Colin