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 Ricardo & Co. discussing optimum ignition advance curves and graphs for different engines.
| Identifier | ExFiles\Box 27\2\ Scan130 | |
| Date | 30th November 1933 | |
| DIRECTORS: H.{Arthur M. Hanbury - Head Complaints} R.{Sir Henry Royce} RICARDO, F.R.S. THE VISCOUNT COMBERMERE. SIR A.{Mr Adams} H.{Arthur M. Hanbury - Head Complaints} McMAHON, G.C.M.G., G.C.V.O. H.{Arthur M. Hanbury - Head Complaints} A.{Mr Adams} HETHERINGTON. K122/5 LONDON OFFICE: 21, SUFFOLK STREET, PALL MALL, LONDON, S.W.1. TEL: WHITEHALL 6644. TELEGRAMS: EMPALIUM, LESQUARE, LONDON. RICARDO & CO., ENGINEERS. (1927) LIMITED. SHOREHAM-BY-SEA STATION, SOUTHERN RLY. TELEPHONES: SHOREHAM-BY-SEA 132 & 385. TELEGRAMS: EMPALIUM, PHONE, SHOREHAM-BY-SEA. CONSULTING ENGINEERS. YOUR REF. OUR REF. Hs{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer}7/KT ATE/S/38645. BRIDGE WORKS, OLD SHOREHAM, Sussex. 30th November, 1933. W. A.{Mr Adams} Robotham Esq., Messrs. Rolls-Royce Ltd., DERBY. Dear Mr. Robotham, Mr. Ricardo has asked me to reply to your letter of the 29th inst. and to forward you the attached curves, which shew mean optimum ignition advance, which we have found from tests on a number of different engines. The ignition advance shewn gives a pressure rise of 30 lbs. per sq. inch per degree crankshaft angle, and in Mr. Ricardo's view should apply to the side-valve exhaust overhead inlet type of head which you have in mind. You will see that the graphs are plotted one against speed and the other against compression ratio at a constant engine speed. If there is any further information you require, will you please let us know. Yours sincerely, A.{Mr Adams} T. Evans. Enclo. Drwg. D.{John DeLooze - Company Secretary} 4212 (2 off). [RED STAMP: ENCLOSURE] | ||