Technology >Rotating cylinder valve


Sectioned Engine

Technical Description

  • The Rotating Cylinder Valve is the earliest version of the engine developed by RCV.
  • The cylinder and rotary valve are in one piece. This single component is mounted in a bearing and rotated around the piston by a pair of 2:1 ratio bevel gears.
  • The smaller gear is directly mounted on the crankshaft and the larger gear being mounted around the base of the cylinder.
  • Primary application areas are model engines.
  • Typical power densities are 70-90bhp/litre
  • The Rotating Cylinder Valve has thermal limitations in larger capacities, and is not as cost competitive as other RCV designs. It is thus not currently being considered for new applications outside of the model engine field.



The main advantage of this design is a compact and simple mechanical


layout. The drive is transferred from the crankshaft to the valve within


the main body of the engine, and without the need for any external


components. This is of particular interest for the model engine


application where compact size is of particular importance. The RCV "SP"


range of model engines take the power output from the top of the


rotating cylinder. This leads to a particularly compact design ideal for


scale modelling applications.