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 showing a motoring loss analysis of a 4¼ Litre Bentley engine, plotting lost horsepower against RPM as various components are removed.
| Identifier | ExFiles\Box 133\1\ scan0214 | |
| Date | 5th April 1937 | |
| 4¼ LITRE BENTLEY MOTORING LOSS ANALYSIS L.H.P FIG. IX C. 80. ① COMPLETE STANDARD ENGINE ② EXHAUST SYSTEM REMOVED ③ INDUCTION SYSTEM REMOVED ④ VALVES, PUSH RODS AND ROCKERS REMOVED ⑤ BOTTOM TAPPETS REMOVED ⑥ PISTON RINGS REMOVED ⑦ PISTONS AND CONN. RODS REMOVED ⑧ CONTACT BREAKER AND DRIVE REMOVED ⑨ WATER PUMP REMOVED ⑩ DYNAMO REMOVED. - R.P.M. - - LOST HORSE POWER - L.P. / 5.4.37 | ||