An internal combustion rotary engine, self cooled, totally concentric and symmetric, dynamically variable compression ratio, capable of developing multiple Otto cycles in each rotation, by means using modules, composed mainly by a solenoid gate valve and three chambers operating at the rotor periphery, producing at low RPM, torsion of value near close at theoretical limit. High power/weight ratio, which increases substantially when number of modules increase, without drive shaft length increase; plus reduced internal friction, is a truly saver fuel machine; with volumetric asymmetry ratio between expansion and compression chambers, and that compression chambers working at beginning of the cycle at normal atmospheric pressure, it gives a fast rise pressure peak, because of the almost wedged form of that chambers. Proper for many types of combustion and class of fuels, including hydrogen, liquefied propane gas and efficient use of air compressed as external energy supply. Excels in aircraft use.