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).
Technical note detailing engine timing procedures and specifications for Condor and Falcon engines.
Identifier | ExFiles\Box 33\4\ Scan085 | |
Date | 16th August 1927 guessed | |
contd :- -2- Unless it was decided to fix a disc and spy hole to Condor Vlll, the same method would have to be used. (B) CONDOR llla. The existing C.111. method of timing can be used in this case, except that we recommend using .010" tapper clearance instead of .005". We have also found that a slightly later timing is beneficial with H.C. of both valves and mags. Below is an average of several readings with .010" clearance from which a standard can be set up, and the existing marks on the discs be ground off and re-marked. I.O. I.C. E.O. E.C. M.A. T.D.C. 55° P.B.D.C. 45° B.B.D.C. 15° E.T.D.C. 30° B.T.D.C. ± 5° limit can be given. These readings are taken in what we consider to be the most accurate way i.e. set the tappet with .020" clearance, then use a .010" feeler - when this is free, or tight, as the case might be, the reading is recorded. We think this method should be generally adopted, as no two people seem to get the same readings when feeling the valves for being open or closed. (C) FALCON X. Xll & Xl. There is no provision for timing F.10. and we do not know if same will ever be required. We time them at the Works by using a disc and pointer fixed on the spring drive. We have suggested a method of providing a disc and sighting hole on F.Xl and F.Xll, but we would prefer to delay standardising any marking as experiments with camshafts are now in progress. Hs.{Lord Ernest Hives - Chair} | ||