The 9000 will be no more or less efficient. While lower KV motors use lower amperage to hit a given RPM, the wind resistance is higher so it is a wash. Efficiency is dependent on construction and load, not KV.
New bearings, new magnet, new glue, heck, new almost everything.
Sweet! I've got an older CM36-5700 which finally gave up the ghost, even the old ones were tough as nails. When will the 9,000s be shipping? I'm looking at buying a street car and that would be a nice motor for it.
All I ever wanted was an honest weeks pay for an honest days work.
Is there any way of knowing these motors over the old ones?
Yes -- new connectors on the new motors. If you have the split type connector, it is the newer motor. If you have the banana type connector (with the twirly bit on the male side) you have the old motor.
Patrick del Castillo
President, Principle Engineer
Castle Creations