The 'Lion' Engine  

  
This picture shows the Lion engine, made in 1921, after restoration. It was found in a derelict condition and restored before being bought by the present owner for further work. Only seven Lion engines of this type are known, but this one, without a carburettor control, may be a unique prototype engine.

It is rated at 2.5 HP and runs on both petrol and paraffin. Starting is done on petrol but when 'warmed up' it is switched over to run on paraffin. In contrast to most engines that 'fire' on a regular cycle, the Lion works on a 'hit-and-miss' principle. When the speed of the engine decreases, the exhaust valve is closed, fuel is drawn in, the magneto produces a spark at the plug, and the speed increases. The exhaust valve is then held open until the speed drops and the cycle repeats itself.
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