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).
Three graphs comparing the BMEP vs RPM of 'Japan I' and 'Peregrine' engines, with and without detonation, using Shell Mex fuel.
| Identifier | ExFiles\Box 42\4\ Scan069 | |
| Date | 20th August 1919 guessed | |
| CURVES SHEWING THAT J1 CAN GIVE MORE SPECIFIC OUTPUT WITHOUT DETONATION THAN PER ALL TESTS SHELL MEX FUEL GRAPH A: COMPARISON OF USEFUL B.M.E.P THAT CAN BE OBTAINED ON THE ROAD JAPAN I COMPARED WITH PEREGRINE Y-AXIS: B.M.E.P. X-AXIS: R.P.M. CURVE LABELS: ① JAPAN I, ② PEREGRINE GRAPH B: JAPAN I Y-AXIS: B.M.E.P. X-AXIS: R.P.M. KEY: ① MAXIMUM B.M.E.P. WITH FULL IGNITION ADVANCE ② USEFUL B.M.E.P. WITH IGNITION RETARDED TO ELIMINATE DETONATION GRAPH C: PEREGRINE Y-AXIS: B.M.E.P. X-AXIS: R.P.M. X-AXIS SUB-LABEL: 25 M.P.H. KEY: ① MAXIMUM B.M.E.P. WITH FULL IGNITION ADVANCE ② USEFUL B.M.E.P. IGNITION RETARDED TO ELIMINATE DETONATION | ||