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 'The Universal Specialloid Piston' highlighting its alloy and oil consumption benefits.
| Identifier | ExFiles\Box 148\4\ scan0305 | |
| Date | 8th October 1934 guessed | |
| Outstanding Points in Design ALLOY SPECIALLOID Ltd. have evolved an Alloy which is the most successful ever used for auto-mobile pistons. The outstanding advantages are: 1. It has a low coefficient of linear expansion. 2. It is nearly as light as pure aluminium. 3. Definitely has the wearing properties of cast iron. 4. It is absolutely reliable, and has never been known to fail in service. (Mileages of over 200,000 on record). 5. Has a heat conductivity of three-and-half times that of cast-iron. OIL CONSUMPTION The SPECIALLOID Piston has been universally accepted as being the most efficient for use in reducing oil consumption to the minimum, and maintaining the lowest m.p.g. over long mileages. (See list of users). Its remarkable performance is controlled by the special ring layout incorporated in each type of piston. Nearly every SPECIALLOID Piston is designed and fitted with a ring of the slotted oil control type in the skirt. Because the smallest possible clearances are allowed on the SPECIALLOID Piston, and it is free from distortion, oil pumping is eliminated, and whilst the SPECIALLOID Piston is so economical on oil, adequate provision is made for the necessary lubrication of skirt. The cast relief about the gudgeon bosses acts as a reservoir and oil is distributed to the grooves—a valuable feature with a pressure-fed engine. SPECIALLOID PISTONS ARE FITTED BY ALL THE LEADING MANUFACTURERS IN THE BRITISH ISLES including : ALBION MOTORS, KARRIER MOTORS DE HAVILAND AIRCRAFT CO., LTD. SCAMMEL LORRIES, GILFORD MOTORS J.{Mr Johnson W.M.} W. BROOKE & CO., LTD. T. S. MOTORS, BEARDMORE MOTORS PEERLESS TRADING CO. LEYLAND MOTORS, BRISTOL TRAMWAYS ASSOCIATED EQUIPMENT CO., LTD., AND ARMSTRONG SAURER and 80% of the Omnibus Companies, Corporations and Transport Contractors. (List of Users) Thomas Tilling. Lancashire United Transport. Eastern Counties Omnibus Co. City Motor Omnibus Co. East Kent Road Car Co. Rhondda Tramways Co. West Yorkshire Road Car. Merseyside Touring Co. Thames Valley Traction Co. Bouts Brothers. Western Welsh Omnibus Co. North Western Road Car. International Tea Stores. East Midland Motor Services. Mickleover Transport. Scottish General Transport. Birmingham Corporation Tramways. Plymouth Corporation (Devon). City of Leicester. Sheffield Corporation. Southampton Corporation. United Automobile Services. Westcliff-on-Sea Motor Services. Hants. and Dorset Motor Services. Birch Brothers. Southdown Motor Services. South Wales Transport Co. East Yorkshire Motor Services. Wilts. and Dorset Motor Services. W. Alexander & Sons. Keith & Boyle, Limited. Red and White Services. Hebble Motor Services. Midland General Omnibus. Southern Roadways. Northern General Transport. Kneller & Chandler. Aberdeen Corporation. British Petroleum Co. Western National Omnibus Co. A.{Mr Adams} J.{Mr Johnson W.M.} Gupwell. Portsmouth Corporation. Chesterfield (Derbys) Corporation. Lipton, Limited. Shell Mex. Strawhatter Coaches. Highways. Thackeray Way Coaches. (Right Panel) The Universal Specialloid PISTON REGISTERED DESIGNS NUMBER 751554, NUMBER 685933 Piston Specialists to the Leading Manufacturers (Car, Commercial, Marine, Diesel and Aero) ON AIR MINISTRY LIST SPECIALLOID LTD. FRIERN PARK NORTH FINCHLEY, LONDON, N.12 Telephone : HILLSIDE 2233. Telegrams : SPECIALLOID, LONDON. And at GLASGOW, MANCHESTER & BRISTOL. | ||