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 Leyland Motors regarding the testing and performance of a Cub engine in aluminium, with enclosed power curves.
| Identifier | ExFiles\Box 140\3\ scan0273 | |
| Date | 2nd January 1939 | |
| 1175 Leyland BY APPOINTMENT TO THE LATE KING GEORGE V.{VIENNA} LEYLAND MOTORS LIMITED, Head Office and Works, Manufacturers of Motor Vehicles. YOURS Rm{William Robotham - Chief Engineer}/14/MH.{M. Huckerby} IN REPLY PLEASE QUOTE: OURS VWP/HK.{Col. T. Harker - Sales} Tel: Ext: 97. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY AND NOT TO INDIVIDUALS CUSTOMERS' VEHICLES DRIVEN AT OWNERS RISK ONLY TELEGRAPHIC ADDRESS LEYMOTORS, LEYLAND. TELEPHONE LEYLAND 81400 (16 LINES) LEYLAND. LANCASHIRE. 2nd January, 19 39. Dict. 29/12. W. A.{Mr Adams} Robotham Esq., Rolls-Royce Ltd., D E R B Y. Dear Robotham, Many thanks for your letter of the 21st inst. on the subject of the Cub engine in aluminium. We have noted that you are extremely interested in the behaviour of this engine due to its being fitted with dry liners and without water between the bores. Unfortunately I am unable to let you have an actual power curve of this particular engine on test because only a duration run was carried out at that time, and the power obtained was identical with that obtained from the standard cast iron engine fitted with aluminium head. A copy, therefore, of the power curve obtained from this particular type of engine is enclosed herewith. I am also enclosing R.D. curves 632, 633, 634, 635, 636 and 637, which will give you an indication of the output of this engine on varying compression ratios. The compression ratio of 6.3/1 was finally selected as the standard to meet all round conditions. I have discussed the question of what we should submit to you for information purposes with Mr. Spurrier Jnr.{Charles L. Jenner} and he has agreed that the engine which has been on test in our Works Lorry shall come in at some time early in the New Year, shall be placed on the test bench for a period of a further two hours to ascertain its final performance after its time in service, will then be stripped and inspected. | ||