Originally Posted by OSherman

dont know what your rules are... but i think we are finally realizing that the 'silvercans' and 'blackcans' (sealed brushed motors) have finally come to a crossroads as far as racing goes... the performance and stress that todays cars and batteries are trying to achieve are just not friendly to such motors. put a 21.5 brushless motor in there and you will rarely 'need' a fan (i can only speak for asphalt racing) but i would imagine one fan pointing at the endbell should be more than enough cooling effort..