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).
Comparative cold starting tests for two Bentley cars.
| Identifier | ExFiles\Box 62\1\ scan0204 | |
| Date | 20th November 1933 | |
| E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. Hs{Lord Ernest Hives - Chair}/Wst.5/MA.20.11.33. STARTING FROM COLD ON BENTLEY. We left 3.B.IV out all night along with 18.G.4 for comparative starting tests. 3.B.IV had the new motor fitted, the larger gauge starter cable, and the positive wire tapped direct from the battery. The air temperature was 6ºC. when the test was carried out and 18.G.4 started immediately with the engine turning over at from 80 to 100 R.P.M. 3.B.IV turned very slowly, about 30 R.P.M., and did not start after 10 seconds turning. Upon releasing the button and pausing a little before repressing the engine started immediately. The main differences between the two cars are :- (a) 18G.4 has a low compression ratio than 3.B.IV. and is well run in. (b) 18.G.4 is running on Castrol XL oil whilst 3.B.IV has mobiloil D.{John DeLooze - Company Secretary} (c) 18.G.4 has an 8 to 1 starter gear ratio as compared with 9 to 1 on 3.B.IV. We are now inclined to think that the Mobiloil D, on which all our Bentley's are now running, is more viscous at low temperatures than Prices or Wakefield's oil. Hs{Lord Ernest Hives - Chair}/Wst. | ||