Valve and magneto timing specifications with a timing diagram.
| Identifier | ExFiles\Box 33\4\ Scan105 | |
| Date | 12th December 1927 | |
| X1770 BY {R.W. Bailey - Chief Engineer} /Cgh {W Clough} 3/K. 12. 12. 27. Hs {Lord Ernest Hives - Chair} Mr. EP. {G. Eric Platford - Chief Quality Engineer} C. Hs. {Lord Ernest Hives - Chair} G. {Mr Griffiths - Chief Accountant / Mr Gnapp} Hnc Copy for Mr Wilkins (A.I.D). RECEIVED RR. F.11. VALVE TIMING. -------------------- We give below particulars of the valve and magneto timing which represents an average of what the Experimental Department have found necessary in order to obtain the best results.- CRANKSHAFT ANGLES TIMING DIAGRAM Diagram Labels: I.O. (Inlet Opens): 6° E.C. (Exhaust Closes): 20° M.A. (Magneto Advance): 35° I.C. (Inlet Closes): 54° E.O. (Exhaust Opens): 46° WITH .010" CLEARANCE The tappets are to be set to give a cold clearance of .020" for running purposes, and a .010" feeler should be used in order to give .010" clearance for timing. Will you please modify our drawing showing the timing markings in accordance with the above and re-issue to the Works. Will EP. {G. Eric Platford - Chief Quality Engineer} please note that the type test engine should be timed in accordance with the above. BY {R.W. Bailey - Chief Engineer} /Cgh. {W Clough} | ||
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).