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).
Power comparison graph for B80 and B60 engine units.
| Identifier | ExFiles\Box 123\5\ scan0324 | |
| Date | 23th February 1939 guessed | |
| COMPARISON OF B80 AND B60 UNIT (POWER) LEGEND: ① B80 (Solid Line): 5.7 LITRES EX 5925 IND'N PIPE OPEN EXHAUST (INCREASED THROAT PD.892) COMPRESSION RATIO 6.2 : 1.0 STANDARD AEROLITE PISTONS AA{D. Abbot-Anderson} 25 TWIN CHOKE STROMBERG CARB. SODIUM FILLED EXHAUST VALVES VALVE TIMING .030 CLCE IO TDC E.O 43° BBDC CAMSHAFT EB.4105 IC 40° PBDC EC 5° BTDC ② B60 (Dashed Line): 4.25 LITRE OPEN EXHAUST (INCREASED THROAT PD.292) COMPRESSION RATIO 6.4 : 1.0 FLUSH TOP AEROLITE PISTONS MOCKED UP BENTLEY V 2 SU CARBS SODIUM FILLED EXHAUST VALVES VALVE TIMING .030 CLCE IO 8° PTDC EO 44° BBDC CAMSHAFT EB4026 IC 28° PBDC EC 4° BTDC GRAPH LABELS: Axes: B.H.P., R.P.M., M.E.P., IGN ADV Curves: MEP, BHP, IGN ADV OTHER TEXT: Stamp: SWDL{Len H. Swindell} Note: M.E.P. 185/0 | ||