NOVELTY - Processing (M1) organic waste products into fuel involves: (a) homogenizing the waste products; (b) heating and pressurizing the waste products; (c) removal of water from the waste products; (d) separation of a selected constituent of the waste products from the waste products into a waste stream; and (e) blending a fuel with the waste stream to form a bio-fuel mixture.    USE - For processing organic waste products into fuel useful in engine of vehicle (claimed) such as tractor, truck and boat.    ADVANTAGE - The method efficiently processes organic waste products into fuel. The crank ring is adjustable during operation of the engine such that the displacement of the engine can be adjusted without stopping of the engine. The engine is designed to control the speed of a vehicle, not merely provide a means of forward or reverse drive; is arranged such that when the driven vehicle is braking or coasting down a hill the driving force provided by the engine combustion rotor is reduced and the stroke of the engine compressor rotor can be increased, thereby offering a controlled and adjustable resistance to the forward motion of the vehicle, this provides an inhibiting factor to the vehicle's forward motion which can be controlled to provide a steady speed, for e.g. down a hill, or alternatively, causing the vehicle to slow and ultimately stop as can be required. The resistance or opposition provided by the engine's compressor rotor (and combustion rotor), to the forward movement of the subject vehicle is adjustable to a maximum degree beyond which standard vehicle disc or drum braking systems can be provided to stop the vehicle in any normal extreme or emergency, however, in most instances the forward acceleration, braking or reverse movement of the subject vehicle can be controlled completely by the engine and in such a manner that enables compressed air, created by the braking action, to be generated and conveniently stored in a suitable pressure vessel, such stored compressed air can then be used as required to drive the vehicle in a selected direction which can be to assist the engine combustion rotor in providing drive to the vehicle in an uphill direction or perhaps during acceleration, thus the efficiency of the vehicle is enhanced substantially.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) an engine having an adjustable displacement comprising: a housing (3002); a crank ring rotatably disposed within the housing; a piston pivotally coupled to the crank ring; and a cylinder rotor (3034) rotatably disposed within the housing and having a cylinder for reciprocatingly receiving the piston, where a distance between a rotational center of the crank ring relative to a rotational center of the cylinder rotor is adjustable to selectively adjust a displacement of the engine; and    (2) a vehicle comprising: a combustion engine; a compressor; a drive wheel; and a drive assembly coupling the combustion engine, the compressor, and the drive wheel in power transfer communication with one another such that the drive wheel is adapted to selectively drive the compressor during a braking operation, and the combustion engine is adapted to drive the compressor and the drive wheel to propel the vehicle forward during non-braking operations.    DESCRIPTION OF DRAWING(S) - The figure shows three dimensional view of the engine.    Housing (3002)    Eccentric (3032)    Cylinder rotor (3034)