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 the 20/25 HP and 25/30 HP engines, plotting BHP and BMEP against RPM.
| Identifier | ExFiles\Box 20\9\ Scan096 | |
| Date | 2nd January 1936 | |
| 20/25 H P AND 25/30 H P POWER COMPARISON OPEN EXHAUST ① 20/25 ENGINE (H7S) COMP RATIO 5.25:1 CARB TYPE 3877 CYL BORE 3.250 DIA Handwritten: Present, Standard ② 25/30 ENGINE G.6 (TURBULENT E.G.3868) NON PIPE E.80870 COMP RATIO 6.0:1 STROMBERG DA{Bernard Day - Chassis Design} 42 CARB CYL BORE 3.500 DIA Handwritten: Proposed Product, Early Type NOTE. CAMSHAFT & VALVES ARE THE SAME ON BOTH ENGINES ③ COMP RATIO 6.0:1 (NON-TURBULENT E.G.5806) NON PIPE H.S. 2014 STROMBERG DA{Bernard Day - Chassis Design} 42 CARB CYL BORE 3.500 DIA OTHERWISE AS ① Handwritten: Test for Cars AXIS LABELS: B.H.P. B.M.E.P. R.P.M. | ||