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).
Letter from Specialloid Limited detailing piston testing procedures and performance.
| Identifier | ExFiles\Box 148\4\ scan0291 | |
| Date | 22th September 1934 | |
| Specialloid LIMITED Friern Park - North Finchley. N.12. -6- Messrs. Rolls-Royce, Limited, 22nd September, 1934. temperature towards the end of the test rises to 110° centrigrade which you will agree is dangerously near to breaking down point of the oil film. Thousands of Specialloid Pistons per year have to pass the following test successfully:- LEYLAND MOTORS LTD. TEST. PERIOD. Motor in...................15 minutes. ½ throttle - 900 revs..........30 minutes. ½ throttle - 1,100 revs.........30 minutes. ½ throttle -- 1,300 revs.........30 minutes. ¾ throttle - 1,500 revs.........30 minutes. Full throttle- 1,600 revs......1 hour. The Pistons are then dismantled, inspected and re-assembled to the engine and further subjected to tests as follows:- Full throttle - 1,700 revs....30 minutes. " " - 1,800 revs....30 minutes. " " - 1,900 revs....30 minutes. In addition to the above detailed tests, Specialloid Pistons are supplied and pass successfully through bench and road tests, arranged by the following:- Messrs. Armstrong Saurer Commercial Vehicles, Ltd., " Sir. W. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Armstrong Whitworth & Co., " W. H.{Arthur M. Hanbury - Head Complaints} Dorman & Co., " Albion Motors, Ltd., " Beardmore Motors, Ltd., " Crossley Motors, Limited, " Aston Martin, Ltd., " Frazer Nash Cars, Limited, " Lagondas, Limited, etc. Recently we had the pleasure of examining a set of Specialloid Pistons dismantled from a Leyland Titantc compression ignition 6-wheeler, operated by the City Bus Co., and we feel sure the result of our examination in relation to the wear figures will be of interest to you. | ||