15-03-12, 06:03 PM
(15-03-12, 05:44 PM)PieEater link Wrote: Second thing he said was that the fan kicks in to protect the fans plastics (not the motor) from the heat from the headers, it's not to aid the cooling system as I thought.
So there you have it (and the reason not to fit a cut-off switch).
Hmmm, not entirely persuaded by that explanation.
Surely if the fan plastics were heat-vulnerable, the fan would kick in whenever the motor is idling for more than a set period, regardless of coolant temp? For that matter, why fit heat-vulnerable plastics to a radiator fan? Doesn't make sense to me.
When I pull into a town after blatting around in mountains, my headers are scorching hot, as is the rest of the motor and parts in close proximity. The fan doesn't come on immediately, though ... it waits until the coolant has reached 98c.
My '99 R1 doesn't do this and there's a lot more heat retained behind the fairing than the Fazer.