rolling rotor motor compressor 10 39 of fig7 is structurally identical to the rolling rotor motor compressor 10 of fig1 6 except for the addition of structure necessary for two pumping chambers to achieve two cylinder operation specifically vanes 34 1 and 2 coact with the outer surface 21 2 of rotor piston 21 to divide the lunette shaped space 24 into chambers 24 1 and 2 which in turn are divided into suction and discharge chambers responsive to the coaction between piston rotor 21 and bore 22 4 thus for compressor operation refrigerant at suction pressure is supplied from the refrigeration system not illustrated via suction lines 36 1 and 2 respectively to the suction chambers defined in chambers 24 1 and 2 refrigerant at discharge pressure is supplied to the refrigeration system not illustrated via discharge lines 37 1 and 2 respectively from the discharge chambers defined in chambers 24 1 and 2 in the conventional manner for a rolling piston compressor due to the coaction of rotor piston 21 bore 22 4 and vanes 34 1 and 2 the rolling rotor motor compressor 100 of fig8 is structurally identical to the rolling rotor motor compressor 10 39 of fig7 except for the relative positions of vanes 34 1 and 2 specifically vanes 34 1 and 34 2 are asymmetrically located such as 120 u00b0 apart rather than being diametrically located for example first stage chamber 24 1 may extend for 240 u00b0 and second stage chamber 24 2 may extend for 120 u00b0 compressor 100 can be used in two different cycles in the first cycle the flow from the larger chamber 24 1 is pumped into the smaller chamber 24 2 to meet the needs of a system requiring a.