Confirming engine timing specifications for the F.11 & 12a engines following a request from the A.I.D.
| Identifier | ExFiles\Box 33\4\ Scan094 | |
| Date | 18th October 1927 | |
| X1770 To DHG from RHC. {R. H. Coverley - Production Engineer} C. Hs. {Lord Ernest Hives - Chair} C. Mr. Wilkins(A.I.D) RHC {R. H. Coverley - Production Engineer} 7/BE.18.10.27. RE F.11. & 12a We understand that the A.I.D. insist that we declare a timing for the above engines. The timings we have been giving these engines when placing on test is: INLET OPENING - 8° - After T.D.C. ) Tappet INLET CLOSING - -38° - After B.D.C. ) clearance EXHAUST OPENING - -30° - Before B.D.C. ) for timing EXHAUST CLOSING - 8° - After T.D.C. ) .030. Running Tappet clearance .020. Magnetos set fully advanced 35° Before T.D.C. As far as we know the above timing is considered satisfactory. Would you kindly confirm? RHC. {R. H. Coverley - Production Engineer} | ||
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).