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 consulting engineer A.B. Buckley regarding research and experimental data for a Buckley Tappet Adjuster.
| Identifier | ExFiles\Box 158\5\ scan0073 | |
| Date | 26th July 1940 | |
| A.B.BUCKLEY, O.B.E., F.C.G.I., M.Inst.C.E., M.Inst.W.E. CONSULTING ENGINEER. TELEPHONE NO. WALLINGTON 2549 TELEPHONE NO. VICTORIA 3219 TELEGRAMS: AIDEFUL, SOWEST, LONDON. CABLES: AIDEFUL, LONDON. CODES: BENTLEY'S. WESTERN UNION 5 LETTER EDITION. [Handwritten address, crossed out] 64 Victoria Street, Westminster, London S.W.1. [Typed address] 9 Pack Hill Carshalton Surrey [Date] 26 July 1940 [Handwritten notes] ark 'ML which file in VALVES File Messrs. Rolls-Royce Ltd Derby. Your Ref:- Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}12/ML.12.2.40 Dear Sirs, Buckley Tappet Adjuster With further reference to your letter of 12 February I beg to say that since writing to you on the 15th February I have been able to do a good deal of research and development work in connection with my Tappet Adjuster as well as to make practical tests which have lead to some considerable simplification and improvement of the design already sent you. I shall be happy to go into this at any time and in the mean while I give you the following statement of experimental data obtained from actual tests for your information. As you know, the principle underlying the design of the adjuster is a leakage of oil through a small orifice in the adjuster piston during the lifting stroke and the return of the same quantity of oil to the pressure side of the piston through a valve of large capacity in the body of the piston during the period of rest between successive strokes. The Adjuster which I have tested has the following particulars:- Diameter of piston in the Adjuster. . . . . . . . . 0.75 inch Valve spring pressures: valve shut . . . . . . . . 55 lbs valve open . . . . . . . . 66 lbs Rate of oil leakage with 60 lbs. spring pressure . . 9.65 Cub.m/m p.Sec. Lift of Cam . . . . . . . . . . . . . . . . . 0.2565 inch The measured lift of the valve at different speeds of the camshaft under the influence of the Adjuster are given below :- Camshaft speed Lift of valve r.p.m. inch 32 0.2525 72 0.253 172 0.253 468 0.253 1,064 0.253 1,808 0.2545 | ||