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 showing B.HP and B.M.E.P. versus R.P.M. for 20/25 HP and 25/30 HP engine configurations.
| Identifier | ExFiles\Box 103\4\ scan0146 | |
| Date | 2nd January 1936 | |
| 20/25 HP AND 25/30 HP. POWER COMPARISON. OPEN EXHAUST (1) 20/25 ENGINE (LVS) COMP. RATIO 5.75:1 CARB-LEC 3877 CYL BORE 3.250 DIA Present Standard (2) 25/30 ENGINE (L 6) (TURBULENT. E.60650) INDN. PIPE E 60470 COMP. RATIO 6.0:1 STROMBERG DA{Bernard Day - Chassis Design} 42 CARB CYL BORE 3.500 DIA Proposed Production Bug NOTE. CAMSHAFT & VALVES ARE THE SAME ON BOTH ENGINES (3) COMP. RATIO 6.0:1 (NON-TURBULENT. ESS805) INDN. PIPE HS{Lord Ernest Hives - Chair} 2014 STROMBERG DA{Bernard Day - Chassis Design} 42 CARB. CYL BORE 3.500 DIA. (OTHERWISE AS (1)) AXIS LABELS: LEFT Y-AXIS: B.H.P. RIGHT Y-AXIS: BMEP BOTTOM X-AXIS: R.P.M. | ||