The 1922 Olympia Show.
DIAMOND. (93.)
Sleeve Valve or Two-stroke Models.
3½ H.P. Model.
79x70 mm. (343 c.c); one cyl. two-stroke; drip feed lubrication; Amac carb.; fly wheel-driven mag.; 3-sp. gear; clutch and kick-starter; chain drive; 26x2¼in. tyres. Price £60.
The D.F. and M Engineering Co., Ltd., Diamond Works, Wolverhampton.
Visitors to this stand will find three different and well-known types of engines, one of which is a two-stroke (the Villiers); another, the well-known standard J.A.P. with side valves, found on so many medium-weight machines; and, last, the Barr and Stroud single-cylinder sleeve-valve engine of 349 c.c. capacity. In each case the power plant is adapted in a remarkably neat and attractive manner. The Sturmey-Archer two-speed gear and Amac carburetter are fitted to machines with the Villiers and J.A.P. engines. A smaller model, also with Villiers engine, may be described as an ultra-lightweight machine. This is fitted with the Albion two-speed gear, and will appeal particularly to those who require a mount that is both substantial and tractable, whilst being at the same time really light.
3½ H.P. Model.
70x90.5 mm. (349 c.c.); one cyl. four-stroke; single-sleeve valve; sight feed lubrication; Amac carb.; chain-driven magneto; 3-speed gear; clutch and kick-starter; chain drive; 26x2¾ tyres. Price £77 10s.
Probably the most interesting model on this stand is that fitted with the 349 c.c. Barr and Stroud sleeve-valve engine; it is chain-driven throughout. The magneto is an M.L., and a Sturmey-Archer three- speed gear is employed. The brake work is well carried out, dummy belt rims being fitted on both front and rear wheels. Altogether this is a most attractive model, and merits close study. In the case of the types fitted with Villiers two-stroke engines, a choice of three varieties is given, i.e. the 150 c.c. ultra-lightweight already mentioned, together with the 250 c.c. and 350 c.c. types. The larger model is fitted with Sturmey-Archer three-speed gear. This or the sleeve valve engined machine is suitable for sidecar work.
Olympia Show 1922 The Motor Cycle, November 30th, 1922. Page 850
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