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 Mechanical Efficiency and Compression Pressure curves for a Lorraine-Dietrich engine, compared with a 20 HP R.R. engine.
| Identifier | ExFiles\Box 22\4\ Scan100 | |
| Date | 21th March 1927 | |
| ③ LORRAINE - DIETRICH ENGINE. 21-3-27 MECHANICAL EFFICIENCY & COMPRESSION PRESSURE CURVES. (RATIO = 5.9 : 1). COMPRESSION PRESSURE (lbs / sq") PERCENTAGE MECHANICAL EFFICIENCY. R.P.M. OF ENGINE. COMP. PRESSURES. MECH. EFFICIENCY LORRAINE. 20 H.P. R.R. 20 H.P. R.R. COMP. PRESSURES (RATIO = 4.75 TO 1) | ||