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).
Road tests of a standard engine's cooling system during hill climbs.
| Identifier | WestWitteringFiles\K\September1923\ Scan49 | |
| Date | 12th July 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} -3- Exptl. No. REF: EXPERIMENTAL REPORT. ROAD TESTS. Taken on 49-GB - standard engine - 4 to 1 compression ratio - standard fan and radiator. Tests taken on hill - leading from Glossop to Chapel-en-le-Frith. Car speed and load conditions kept the same for each test. Atmospheric temperature remained constant to within 2 degrees. Starting temp. for climb 85°C. Release valve set at :- [TABLE] Conditions | Standard | 2 lbs. | 3 lbs. | 4 lbs. | 5 lbs. Time before water commences to boil. | 3 min. 8 s | 4 min. 12 s | 5 min. 52 s | 4 min. 13 s | " 2 " | " 30 " | " 58 " | " 58 " Amount of water lost on hill. | 3.5 pts. | 2.9 pts. | 1.9 pts. | 1.25 pts. Total time 7 mins. 15 secs. | 3.9 " | 3.1 " | 2.3 " | 3 " | ||