Suck or Blow?

[ianlloyd]

I am sure this has been asked before but my memory on the outcome is vague (it's an age thing)

Motor Fans is what I refer to. Is it better for them to suck the hot air out of a motor or to blow cooler air in to the motor. Or indeed does it make no difference whatsoever?

I am sure there must be some technical wizard out there that has a really good answer ;D

[Dave Chamberlain]

I'm voting for blow

Fans are used to blow cool air at your hot motor / ESC not to suck the heat out..

However in a perfect world you would use two fans one blowing and one sucking... Now there's a thought

[Reality Racer]

I recon blow. But make sure you have at least a couple of mm air gap between your fan & ESC

[chrishall1976]

what about both lol

[lesbaldry]

Jul 28, 2011 10:13:27 GMT ianlloyd said:

I am sure this has been asked before but my memory on the outcome is vague (it's an age thing)

Motor Fans is what I refer to. Is it better for them to suck the hot air out of a motor or to blow cooler air in to the motor. Or indeed does it make no difference whatsoever?

I am sure there must be some technical wizard out there that has a really good answer ;D

Personaly I dont believe motor fans do much good at all,You very rarely see one used on any of the top drivers cars.....Put it this way thrers no point in blowing a fan over the oven when the roast is burning...The damage is already been done to the internals,But for a speedo yes! as the heat sink is in direct contact with the fets(via a thermal paste) unlike a motors windings and insulation to the Can or in a brushed motor's case the air gap between the Com stack and magnets....if your motors getting hot then the speedo's profile is wrong or the gearing....just my thoughts