Doh

I'm having some cooling issues as discovered after going on track at FF, on track is fine temp sat at just under 90 degrees during the session but as soon as i got off it shot up to over 100 before i managed to switch the motor off

i'm currently using a pacet 14" pusher fan (i realise a puller would be more efficient but due to space restrictions a pusher is the only option)

i'm thinking of trying a Pacet heavy duty 16" pusher which will just fit on the rad, what i'm wondering is would 2 smaller fans be better? i think i would only be able to fit 2 10" fans though... looking at the CFM figures the 16" flows more 2354CFM compared to 2 x 10" fans at 2180CFM... is it as simple as that? what about surface area etc? whos good at this science stuff LOL or anyone got any practical experience?

foreigneRS

firstly, why do you think a puller would be better than a pusher? if the manufacturer has figures of flow vs. pressure drop that says so, then fine. but there is no technical reason why it should be so

i suspect that 2 x 10" would be better than the single 16" simply because they will cover a greater area (if no cowls are used with either choice)

is your 14" just fixed up against the rad without any cowling? if so, might be worth fabricating a cowling so that the air pushed by the fan spreads out over the whole rad surface area. you will have a large dead spot in the centre of the fan as it is.

i also would not have switched off immediately as you could cause problems from hotspots. it would be ideal if you could keep driving at low load with a good airflow until the engine had cooled, but it's not always easy at these events