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).
Series of graphs comparing the useful BMEP of 'Japan I' and 'Peregrine' engines against RPM, focusing on performance with and without detonation.
| Identifier | ExFiles\Box 179b\2\ img005 | |
| Date | 4th October 1932 guessed | |
| CURVES SHEWING THAT J1 CAN GIVE MORE SPECIFIC OUTPUT WITHOUT DETONATION THAN PER ALL TESTS SHELL MEX FUEL GRAPH A: COMPARISON OF USEFUL BMEP THAT CAN BE OBTAINED ON THE ROAD JAPAN I COMPARED WITH PEREGRINE Y-AXIS: BMEP X-AXIS: RPM LEGEND: ① JAPAN I ② PEREGRINE GRAPH B: JAPAN I Y-AXIS: BMEP X-AXIS: RPM LEGEND: ① MAXIMUM BMEP WITH FULL IGNITION ADVANCE ② USEFUL BMEP WITH IGNITION RETARDED TO ELIMINATE DETONATION GRAPH C: PEREGRINE Y-AXIS: BMEP X-AXIS: RPM LEGEND: ① MAXIMUM BMEP WITH FULL IGNITION ADVANCE ② USEFUL BMEP IGNITION RETARDED TO ELIMINATE DETONATION OTHER TEXT: 25 MPH | ||