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The Mk.12 Villiers four-cycle, side valve engine was another typical Villiers product. Infact it was a slightly larger version of the Mk10 engine. It is this simplicity that made Villiers engines popular, reliable and easy to maintain. This engine also included the Villiers flywheel magneto, with the engine cooling fan mounted on the outside of the flywheel. Most of the parts were made in-house and additional parts were available for petrol-paraffin running.
The engine had a 55mm bore and a 50mm stroke. The total swept volume was 120c.c. and the engine could deliver 1.5 b.h.p. at 2,800 r.p.m and 1.95 b.h.p. at 3,400 r.p.m (HS Engine). It was air-cooled by fan and cowling. The engine was fitted with a Villiers B10 carburettor as standard, the air filter being of the oil wetted gauze type or oil bath. The capacity of the fuel tank was 0.5 gallons. Lubricating is by “splash”. The oil sump held one pint. It was fitted with a Lodge CB3 (18 mm) spark plug, BN (14 mm) for later engines.
The military version of this engine had the words “The V Engine” cast into the crankcase. The V engine saw service in a wide range of applications. In keeping with engines designed for military use, the engine came fitted with reinforced fuel pipes and a screened ignition system.
The engine pictured below spent its working life powering a lathe in a private workshop.
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