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 comparing the power per unit cubic capacity and petrol consumption of a Lorraine-Dietrich engine and a 20 HP engine.
| Identifier | ExFiles\Box 22\4\ Scan101 | |
| Date | 16th March 1927 | |
| 4 LORRAINE-DIETRICH & 20 HP R.R. COMPARISON OF POWER PER UNIT CUBIC CAPACITY & PETROL CONSUMPTION. COMPRESSION RATIOS:- LORRAINE = 5.9 to 1 20 HP R.R. = 4.75 to 1. BRAKE HORSE POWER PER LITRE R.P.M. OF ENGINE. B.H.P. PER LITRE. LORRAINE. 20 HP R.R. 20 HP. R.R. WITH 5.9 TO 1 COMP. RATIO. (CALCULATED). PETROL CONS. (PTS / BHP / HR) LORRAINE 20 HP. R.R. CONSUMPTION (PTS / BHP / HR) | ||