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 to Leyland Motors discussing Silichrome inlet valve seats, bearings, and engine filtration methods.
| Identifier | ExFiles\Box 140\3\ scan0225 | |
| Date | 12th November 1938 | |
| 1175 Rm{William Robotham - Chief Engineer}3/R.{Sir Henry Royce} 12th November, 1938. V.W. Pilkington, Esq., Leyland Motors Limited, L E Y L A N D, Lancs: Dear Mr. Pilkington, Many thanks for your letter of the 11th Decmmber. I am sending you detail drawings of screwed-in inserts on P.III. We have recently adopted Silichrome for inlet valve seats with complete success and considerable saving of money. In America it is general practice to put seats in without screwing them, and we send you a portion of the report on the subject - information obtained last time I was in America. We have, however, no experience in production with this procedure, though we are going forward with some experiments forthwith. Blackith was up here on bearings yesterday, and showed me some out of your Cub. I noticed slight score markings on several of these bearings, and suggest that for test bed work you should use some very large and very fine full flow filter on the delivery side for the first few hours after the engine is assembled. Also, for running-in purposes, we find that a centrifugal filter in the system is the best way of getting out the foreign matter which is unavoidably present in a new engine when it is built up. Once, of course, an engine has been cleaned during the initial stages of running-in, a by-pass filter will take up any further foreign matter which may be loosened during running. Yours sincerely, | ||