A rotary engine is assembled in layers. The two-rotor engine we took apart has five main layers that are held together by a ring of long bolts.
Coolant flows through passageways surrounding all of the pieces.
The two end layers contain the seals and bearings for the output shaft. They also seal in the two sections of housing that contain the rotors. The inside surfaces of these pieces are very smooth, which helps the seals on the rotor do their job. An intake port is located on each of these end pieces. The next layer in from the outside is the oval-shaped rotor housing, which contains the exhaust ports.