I'm pretty sure that there are some internal parts that are shared with these motors. Obviously not all of them as they are different motors, but even the heads are interchangeable with some motors (I know the 1.40DZ and 1.60DZ are). That's sort of like complaining that there aren't shared parts between the OS 1.40 RX and 1.60FX.

Atul, I have not had a chance to tach the motor to see what it's turning with a 19x11, but will as soon as I can. The weather has been sort of bad around here lately. I hope to fly by the weekend, however.