From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Advertisement for Wedgerite Piston Rings which expand in width as well as in diameter.
| Identifier | ExFiles\Box 16\1\ Scan135 | |
| Date | 23th March 1921 guessed | |
| WEDGERITE · PISTON · RINGS EXPAND IN WIDTH AS WELL AS IN DIAMETER Image of Piston: WedgeRite PISTON RINGS Expand in Width and Diameter TRADE MARK REGISTERED PISTON RINGS are metal packing used to prevent the escape of gas on the compression stroke and loss of force on the power stroke of any gas or gasoline engine, and of pressure in steam engine, hydraulic press or air compressor. Any piston ring of plain or patented design, properly fitted, will prevent any very serious loss, but unfortunately for the owner of the engine the efficiency is only temporary in the case of 99 per cent of all makes of piston rings. The hard work that they are called upon to perform will in a short time cause considerable wear on the bearing surfaces of the rings themselves, as well as in the piston grooves. As soon as this wear amounts to even so small a fraction as 2/1000 of an inch, the efficiency of the ring is seriously impaired, and it is constantly decreased with continued wear. Particularly in automobile engines this condition is usually indicated by the tendency of the pistons to syphon oil to the combustion chambers, with the consequent fouling of the spark plugs, valves, and piston heads, causing knocking and loss of power. It is evident, therefore, in the case of 99 per cent of rings mentioned, it would be necessary to put in new rings especially made oversize to take up the wear in the piston grooves. But this is only a temporary remedy, for in a few months the same old troubles will reappear. The remaining 1 per cent is represented by WEDGERITE PISTON RINGS, with their big outstanding feature of WIDTH EXPANSION. The result of this width expansion is the complete filling of already worn grooves, and the automatic taking up of all additional wear, also the prevention of piston slapping and ring knocks, by the steady pressure of the ring against the groove walls. This pressure also prevents any rotary motion of the ring in the groove, thus permitting it to wear down to a bearing in one position, and adapting its shape to that of the cylinder walls. WEDGERITE PISTON RINGS are made from the very best materials obtainable for the purpose. This necessitates a very close-grained gray iron which possesses the qualities of softness, smoothness, toughness, and permanent elasticity. Each ring is made from an individual casting which is machined concentric and accurate to size, insuring even quality and uniform radial bearing pressure. A complete ring is made up of three sections, consisting of the two outer or bearing rings, and a wedge-shaped ring of untempered spring steel. This steel ring is made with a diameter slightly larger than the inside diameter of the outside sections and, therefore, when placed between them in the groove it exerts a constant outward pressure against the inner beveled surfaces, wedging them apart and holding the ring against the groove walls with a constant pressure. WEDGERITE PISTON RINGS are still a perfect fit after years of service, and barring gross neglect of lubrication and accident will give PERMANENT MAXIMUM EFFICIENCY. INSURING · PERMANENT · MAXIMUM · EFFICIENCY WEDGERITE PISTON RING CO. LIMITED Factories: MONTREAL, QUEBEC PLATTSBURG, N. Y. | ||