The air cooled Wolseley engine was introduced in 1954 to try and break into the market of simple, cheap and robust power units that required virtually no maintenance. Water cooling was often seen as restrictive for periods of short running since water would have to be brought to the engine and drained after use. With an air cooled engine, all you needed to do was re-fuel, check the oil and start. The air cooled range remained in production until engine manufacture ceased in 1975 with the production of over 9,300 engines. The engine used the same bore and stroke as the WLB giving an output between 2 HP - 5 HP. Early engines had an exposed flywheel (as shown in colour photo above), later versions had a more enclosed flywheel, revised cowling, flat silencer and a different carburettor. The photo below shows the carburettor side of the above engine highlighting the 'trumpet' type arrangement for blowing hot air into the carburettor to aid vaporisation of paraffin in the petrol/paraffin version. It is very rare to find an air cooled Wolseley with this still attached as they are often lost. Furthermore, this engine also boasts the original silencer, which again is not often seen as they tend to rust beyond repair.