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).
Graph plotting Brake Horse Power against RPM to show the effect of varied exhaust valve timing on engine I.G.I.
| Identifier | ExFiles\Box 48\4\ Scan103 | |
| Date | 16th July 1923 guessed | |
| BRAKE HORSE POWER EFFECT OF VALVE TIMING ON POWER. ENGINE I.G.I. INLET VALVE TIMING FIXED: EXHAUST TIMING VARIED. R.{Sir Henry Royce} P. M.{Mr Moon / Mr Moore} INLET TIMING (CONSTANT) I.C 45° I.O 5° TAPPET CLEARANCE .010 EXHAUST ______ E.C 5° E.O 16° EXHAUST -- -- E.C 8° E.O 18° EXHAUST ---- E.C 10° E.O 39° EXHAUST ......... E.C 10° E.O 55° EXHAUST ------ E.C 21° E.O 27° | ||