Rotary valve engines
designed by Hofmann-Drehschiebermotoren
BMW F650 single cylinder engine with rotary valve cylinder head | Moto Guzzi 950 V2-engine with rotary valve cylinder heads |
Section of our rotary valve cylinder head | What is a rotary valve train?
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Advantages of the rotary valve train
compared with poppet valve trains
- Less package (20-50%) and less weight (20-60%) of the cylinder head
- No speed limit of the valve train
- Scavenging areas are equal or superior to those of modern four valve cylinder heads
- Reduction of mechanical friction losses
- Free of maintanance
- High compression ratios similiar to Diesel engines without knocking are realizable and enable a significant reduction of fuel consumption and a high compatibility of exhaust gas reduction (EGR)
- Less production costs by a lower number of components and easy assembling
- Reduced noise emmision of the cylinder head due to missing oscillating poppet valves
- Suitability for twostroke and fourstroke engines
- Suitability for various types of fuel and systems of carburation
- Suitability for various types of engines like motorcycle, passenger car, range extender, stationary engines, etc.