Ruffells, the P.V. (Elliston & Fell), the Sparkbrook, the Yvel, the P&S lightweight (Pearson and Sopwith), the Chater-Lea, the Campion, the Victoria (of Glasgow), the Hobart, the Olympic, the Ixion, the Bown-Villiers, the Wilkin, and the Saltley. The engine remained much the same, and continued to use a separate magneto, though it did have an oil pump to provide crankcase and piston lubrication via a hollow crankcase bolt - a design that Villiers had patented during 1914/1915.

The Mark III engine embodied some changes to crankcase and