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59 The Rotating Cylinder Valve 4-Stroke Engine A Practical Alternative
Published October 29, 2002 by Society of Automotive Engineers of Japan in Japan
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The Rotating Cylinder Valve (RCV) Engine is a novel 4 cycle engine that is a practical alternative to conventional 2 and 4 stroke designs, in particular for small capacity single cylinder applications. It is primarily intended to address applications where emissions legislation is forcing manufacturers to abandon the traditional carburetted 2 stroke. It has particular benefits for the moped/light motorcycle market.
The engine operates on a simple principle. The cylinder liner is rotated around the piston at half engine speed via a pair of bevel gears. A port in the side of this cylinder indexes with inlet and exhaust ports in the surrounding casing. This rotary valve serves the cylinder as the engine cycles through the conventional 4 stroke cycle.
The main technical issue that has been addressed is the design of a practical rotary valve seal. The RCV seal design provides a gas-tight compression seal, accommodates large thermal distortions, and takes up both production tolerance and longer term wear. The design is low cost, and simple to assemble and service. The rest of the components within the engine are conventional.
The RCV engine offers all the normal emissions advantages that a 4 stroke has over a conventional 2 stroke. It also has many benefits compared to a conventional poppet valve 4 stroke, in particular a predicted production cost comparable to a conventional 2 stroke.
The design has other significant technical benefits, including excellent thermal distribution, and good breathing characteristics. For moped applications the rear wheel power output of the engine will be competitive with current 2 stroke designs and exceeds the power output of typical small capacity poppet valve 4 stroke designs.
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CitationLAWES, K., "59 The Rotating Cylinder Valve 4-Stroke Engine A Practical Alternative," SAE Technical Paper 2002-32-1828, 2002.
- Ricardo Consulting Engineers Limited, “RCV Engine Assessment”, July 2001.
- CV Engines Limited, “Briefing Manual - Description And Analysis Of RCV Engine Technology”, www.rcvengines.com, October 2001
- The University of Texas at Austin; Dardalis, D, “Rotating Liner Engine - UT Austin Graduate Patents Process For Saving Diesel Engine Fuels”, On Campus, April 26, 2001 - VOL. 28, NO. 06
- Garner, Colin Dr “Brief Appraisal Of The RCV Engine For Its Application To Motor Scooters”, Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University Consultants Ltd, March 2001