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).
Report page detailing observations on engine performance, vibration, and fuel/oil consumption for test cars.
| Identifier | ExFiles\Box 5a\4\ 04-page243 | |
| Date | 29th January 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}12/EW.29.1.36. Sg{Arthur F. Sidgreaves - MD}'s driver reported to me that the plugs sooted up more than is usual with the 25 HP. On the road 21-G-IV ran as slowly and smoothly as Sg{Arthur F. Sidgreaves - MD}'s car. There was less vibration at 40 m.p.h. on Sg{Arthur F. Sidgreaves - MD}'s car than on 21-G-IV. We should say that this period on 21-G-IV is more noticeable now than when the car was first tried. There is definitely something wrong with the damper, but this can hardly be attributable to the big bore. It was noticed that the engine mounting of Sg{Arthur F. Sidgreaves - MD}'s car was less flexible than that of 21-G-IV, and our usual mountings. Consumptions. The following are the consumptions of the days' runs in traffic, and open road and traffic. (1) Open road and traffic 176 miles - 14.6 m.p.g. (2) Traffic 99 miles - 12.9 m.p.g. (3) Traffic 143 miles - 13.0 m.p.g. (4) Traffic and open road 160 miles - 14.3 m.p.g. Approximate oil consumption for 678 miles was 462 m.p.g. A further consumption over 250 miles obtained by Hs.{Lord Ernest Hives - Chair} on this car was 15.2 m.p.g. | ||