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 test results for engine cooling performance on a hill climb with varying release valve pressures.
| Identifier | ExFiles\Box 24\4\ Scan263 | |
| Date | 8th October 1924 guessed | |
| contd :- -3- 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°. |------------------|----------|----------------------------|----------|----------|----------| | | | Release valve set at - | | | | | Conditions. | Standard | 2 lbs. | 3 lbs. | 4 lbs. | 5 lbs. | | | mins.secs| mins. secs.| mins. secs.| mins. secs.| mins. | |------------------|----------|------------|------------|------------|----------| | Time before | 3 8 | 4 12 | 5 52 | 6 13 | ---- | | water | 3 2 | 4 30 | 5 58 | 6 55 | ---- | | commences | | | | | | | to boil. | | | | | | |------------------|----------|------------|------------|------------|----------| | Amount of | | | | | | | water lost | 3.5 pts. | 2.9 pts. | 1.9 pts. | .125 pts. | ---- | | on hill. | 3.9 " | 3.1 " | 2.3 " | .3 " | ---- | | Total time | | | | | | | 7 mins. | | | | | | | 15 secs. | | | | | | |------------------|----------|------------|------------|------------|----------| HS{Lord Ernest Hives - Chair}/ACL. | ||