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 on engine cooling performance during a hill climb.
| Identifier | ExFiles\Box 38\2\ Scan197 | |
| Date | 12th July 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. -3- Expl. No. REF: 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. Release valve set at,- | Conditions - | Standard. | 2 lbs. | 3 lbs. | 4 lbs. | 5 lbs. | |---|---|---|---|---|---| | Time before water commences to boil. | 3 min. 8 | 4 min. 12 | 5 min. 52 | 6 min. 13 | / | | | 3 min. 2 | 4 " 30 | 5 " 58 | 6 " 55 | | | Amount of water lost on hill. Total time 7 mins. 15 secs. | 3.5 pts. | 2.9 pts. | 1.9 pts. | .125 pts. | / | | | 3.9 " | 3.1 " | 2.3 " | .3 " | | | ||