The 1920 Olympia Show.
Quadrant. (Stand 41.)
6 h.p.; 87x110 mm. (653 c.c.); single-cylinder four-stroke; side-by-side valves; hand pump lubrication; Amac or Senspray carburetter; gear-driven magneto; three-speed Sturmey-Archer gear; chain drive: 26x2½ in. tyres. Price with side-car £155.
March Newark and Co., Ltd., Lawley Street, Birmingham.
The Quadrant is a serviceable and steady mount, suitable for everyday hard work without needing undue care or attention. The principal model is the new 6 h.p., chiefly notable for a very wide and substantial crank case, which is kept smooth on the exterior, and, therefore, is exceptionally easy to clean. This idea has been consistently carried out, in that the number of plated parts on the motor cycle is reduced to a minimum. The riding position, and shape and length of handle-bar are good, and the sidecar chassis appears to be quite substantial enough to stand the exceptionally rough usage which this type of machine is usually accorded. Mechanically, the design differs from the ordinary in that the two valve ports are entirely separate, the inlet valve being behind the cylinder and the exhaust at the side, in a position where it obtains the maximum cooling draught. By this arrangement the valve springs, valve stems, and cotters become quite accessible, and can be cleaned or adjusted without trouble. A second model of 45 h.p., also a single-cylinder, is shown on the stand, and is designed chiefly for dual-purpose work.
To add to the interest, a sectional engine of this type is shown, and prospective customers can see for themselves every part of the mechanism, including the crank case, timing gear, and valve operation, while, as this engine is of the same design as the 6 h.p., the method of actuating the two valves by separate cams can be studied in detail. The smaller machine is sold with sidecar at the very moderate figure of £145.