A rotary engine is described including: (1) a rotor located within a housing, the rotor configured with a plurality of rotor vane slots; (2) a vane separating an interior space between the rotor and the housing into at least a trailing chamber and a leading chamber, where the vane slidingly engages a rotor vane slot; (3) a first passage through the vane, the first passage including a first exit port into the rotationally trailing chamber; and (4) a second exit port to the rotationally trailing chamber, where the first exit port and the second exit port connect to any of: (a) the first passage through the vane and (b) the first passage and a second passage through the vane, respectively. Optionally, one or more seals affixed to the vane and/or the rotor valve the first passage, the second passage, a vane wingtip, and/or a conduit through the rotor.