DETAILS of a remarkable research engine have recently been released by Armstrong‐Siddeley Motors, Ltd. The unit has been in use for some time in their research and development department in connection with their cars and aero‐engines and has played an important part in the development of the new Siddeley Special power unit. The special feature of the engine, which is claimed to be unique, is that the three factors governing the valve timing, i.e., the lift, the period of opening and the moment of opening and closing, can all be varied independently of one another while the engine is running. An interesting point is that this is achieved by the use of two cams only, one operating the exhaust and the other the inlet valve. The engine, which is of the single‐cylinder overhead valve type, is arranged so that cylinders of various bores can be fitted to the crankcase, and thus a cylinder of any one of the range of Armstrong‐Siddeley engines can be be fitted.
(1933), "A Special Valve Gear for Research: Details of the Armstrong‐Siddeley Single‐Cylinder Test Rig with Three Variables", Aircraft Engineering and Aerospace Technology, Vol. 5 No. 12, pp. 307-307. https://doi.org/10.1108/eb029758
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