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 of PII BMEP curves for various engine configurations, taken with open exhaust.
| Identifier | ExFiles\Box 13\2\ 02-page085 | |
| Date | 3rd June 1921 | |
| CURVE(3A) PII BMEP CURVES. ALL TAKEN OPEN EXHAUST (A) R.R.CH.EAGLE IX CARB. (4.9:1 COMP.RATIO)(R.TYPE 110° CAMSHAFT) (B) TWIN CARBS 1.4 CHOKES ( " " " )( " " " ) (C) TWIN CARBS 1.3 CHOKES (4.6:1 STD. COMP.RATIO)(STANDARD CAMSHAFT) (D) STANDARD CARB. ( " " " )( " " ) BMEP RPM 120 110 100 90 80 70 60 500 1000 1500 2000 2500 3000 3500 A B C D L.M.S 3-6-21 | ||