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).
Tables of energy distribution percentages for supercharged engines at different compression ratios and speeds.
| Identifier | ExFiles\Box 140\1\ scan0215 | |
| Date | 28th March 1938 guessed | |
| -11- Engine Speed, R.P.M. Percent Converted to Brake Work * Percent in Cooling Water. Percent in Exhaust Gases, Radiation, and Unaccounted for. 5.55 to 1 Compression Ratio Engine Supercharged to an Inlet Manifold Pressure of 10 inches of Mercury above Atmospheric. 500 16.4 22.3 61.3 1,000 20.9 20.6 58.5 1,500 22.2 19.2 58.6 2,000 23.5 18.1 58.4 2,500 22.9 16.2 60.9 3,000 23.7 16.0 60.3 3,500 23.1 17.2 59.7 4,000 20.3 18.7 61.0 4.25 to 1 Compression Ratio Engine Supercharged to an Inlet Manifold Pressure of 10 inches of Mercury Above Atmospheric. 500 17.9 27.0 55.1 1,000 20.5 23.9 55.6 1,500 20.8 21.1 58.1 2,000 20.5 18.6 60.9 2,500 20.0 17.3 62.7 3,000 20.4 18.2 61.4 3,500 20.1 17.8 62.1 4,000 18.9 17.8 63.3 * Based on dynamometer scale readings while engine was supercharged by separately-driven blower. | ||