Direct drive brushless motor for pump
 

Will this motor be suitable? http://www.giantshark.co.uk/c506509-kv270-p-407464.html
not sure if my calculation is correct but 4s lipo charged = 16.8x270kv = 4536 -10% lost for motor effeciency = 4082rpm
using jung 0.30cc should be fine for no load rpm right?