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).
Vehicle 18.G.IV at 15,000 miles, detailing engine, fuel consumption, and piston performance.
| Identifier | ExFiles\Box 5a\3\ 03-page311 | |
| Date | 20th June 1933 | |
| To Hs.{Lord Ernest Hives - Chair} From G.W.H. Hotel de France. Chateauroux. Indre. 20.6.33 REPORT ON 18.G.IV. AT 15,000 MILES. ENGINE STANDARD UNIT U.7.S. Fitted with totally enclosed Carburetter and silencer to LOP. E.{Mr Elliott - Chief Engineer} 59457-LeC.3409-3426. The engine has been very silent with the fitting of the carburetter silencer. There has been no falling off in power, acceleration and flexibility has been equal to a good standard 25 H.P. production. - - - - - - - - - - - - - The petrol consumption figures are as follows: 30 M.P.H. 18.33 M.P.G. 40 M.P.H. 16.78 M.P.G. 50 M.P.H. 14.81 M.P.G. The acceleration figures of the car are as follows: M.P.H. TIME 10-20 4.9 Sec. 20-30 6.95 " 30-40 6.85 " 40-50 8.15 " 50-60 12.65 " - - - - - - - - - - - - - PISTONS LOP.E.57889. Complete to above LOP. The following New pistons fitted by Expt. Dep. 2-E.57122 pistons to Arrgt.E.58504 fitted to No1 & 6 A piston knock developed after 3738 miles which was intermittent at first afterwards becoming definate when the | ||