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 against a 20 HP R.R. engine.
| Identifier | ExFiles\Box 5a\5\ 05-page021 | |
| Date | 16th March 1927 | |
| ④ LORRAINE-DIETRICH & 20 HP R.R. COMPARISON OF POWER PER UNIT CUBIC CAPACITY & PETROL CONSUMPTION COMPRESSION RATIOS:- LORRAINE = 5.8 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 5.8 to 1 Comp Ratio. (Calculated). PETROL CONS. (PTS/BHP/HR) LORRAINE 20 HP R.R. CONSUMPTION (PTS/BHP/HR) | ||