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).
Performance graph comparing valve sizes and carburetor setups for a Phantom II engine unit with an open exhaust.
| Identifier | ExFiles\Box 13\2\ 02-page142 | |
| Date | 31th October 1931 guessed | |
| COMPARISON OF VALVE SIZES W.W. 114° CAMSHAFT RM{William Robotham - Chief Engineer} P.24 4.78 C.R. P.II UNIT OPEN EXHAUST VALVES 2" THROAT HEAD MACHINED TO GIVE A MINIMUM CLEARANCE OF .2" ROUND VALVE STD. 1.90 THROATS HEAD STANDARD .013 TAPPET CLEARANCE CLAUDEL TIMING A TWIN CARBS 1:4 CHOKES TIMING B B. TIMING. 7° EARLIER Valve Timing Diagram: EX 58, IN 54, 3, 12 DEPN TWIN CARBS DEPN CLAUDEL B.H.P. R.P.M. B.M.E.P. LBS/SQ INDUCTION INS. HG | ||