[Christ]

Thing is, any piston engine with more than 2 cylinders could start with air injection... Any rotary engine, including single rotors, can also start this way.

The pressure necessary could be generated, on a turbo engine, by adding a separate accumulator tank to the intake manifold with a check valve. Turbo spools to twenty psi or so, fills the volume in the tank. Later, when the engine should restart, air is injected to whichever cylinder is highest in the stroke after tdc. Rotary, just blow some air into the (closed) inlet manifold...