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 for a Peregrine engine showing the effect of spark plug reach.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page187 | |
| Date | 2nd June 1932 guessed | |
| PEREGRINE 5.85 C/R.{Sir Henry Royce} OPEN EXHAUST. EFFECT OF PLUG REACH. RM{William Robotham - Chief Engineer} PH SINGLE S.U. 1 5/8 THROTTLE. DIA. S.U. ① STANDARD REACH PLUGS .500 ② PLUGS REACH .680 COMPRESSION PRESSURE B.H.P. R.P.M. COMPRESSION PRESSURES. LBS/'' B.M.E.P INDUCTION DEPN. INS. HG. VALVE TIMING DIAGRAM: 1° BEFORE 35 Ex. IN .020 CLCE 41 46 VALUE LIFT .320 GRAPH LABELS: B.M.E.P. INDUCTION DEPN. | ||