hi guys i can't make photos because i'm in spain for the holydays till the 16 of july, when i come back i'll post some photos and videos Asap.
Obviusly the motors have been geared down and the esc controller for the motors has been setted for a maximum of 6000 rpm allowed.
for the 100% compatibility i explained my self wrong, for me compatibility with lego means that the engine have to been covered with a 3d printed cover that allows to connect it like the stock lego motors.
Now i'm doing some tests to find the real maximum rpm and torque allowed with lego ;)
sorry if this topic will be a little bit in slow progress but my free time is very little