[snellemin]

You don't see dragracing(2 seconds and less) being won by 4 pole or higher motors. Some are experimenting with smaller 4 poler motors and having some success. But this is mostly due to the smaller diameter rotors.

I read this on rcgroups not too long ago, posted by murdnunoc
" high pole motor spins slower at max frequency because the motor turns a smaller amount for each pulse. A two pole motor will spin much faster for a given frequency of pulses because each pulse pulls the magnets a farther angular distance."