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).
Test log sheet recording various temperatures under different vehicle running conditions.
| Identifier | ExFiles\Box 160\4\ scan0040 | |
| Date | 13th March 1939 guessed | |
| Test No. | Running Conditions. | Tyres and max. lap speeds. | Water Temp: | Outside Air Temp: | Underbonnet Air Temp: | Maximum Oil Temp: 1 | Fanbelt removed. Thermostat in water system. Cold air intake. Cut-out closed. SMALL VENT IN UNDERSHIELD AT FRONT OF SUMP. | F. {Mr Friese} 18 x 5.50 Rd R. {Sir Henry Royce} R. {Sir Henry Royce} 19 x 6.50 Rd R. {Sir Henry Royce} 45 lbs. cold. 105 M.P.H. | 77°C. | 13°C. | 31°C. | 126°C. after 12 laps. 2 | Scoop fitted to undershield blank plate beneath sump. Remainder as 1. | F. {Mr Friese} 18 x 5.50 Rd R. {Sir Henry Royce} R. {Sir Henry Royce} 19 x 6.50 Rd R. {Sir Henry Royce} 45 lbs. cold. 105 M.P.H. | 77 | 11 | 30 | 125°C. after 13 laps. 3 | Coiled pipe fitted to suction side of oil pump. Scoop & blank plate retained Thermostat removed from water system. Fan Belts fitted. Cold air pipe disconnected from front end of air silencer since there was danger of it fouling the fan. | F. {Mr Friese} 18 x 5.50 Rd R. {Sir Henry Royce} R. {Sir Henry Royce} 19 x 6.50 Rd R. {Sir Henry Royce} 50 lbs. cold. 106 m.p.h. | 52 | 9 | 26 | 112°C. after 10 laps. 4 | Thermostat valve replaced in water system. Fan belt removed. COILED PIPE, SCOOP, & BLANK PLATE RETAINED. COLD AIR PIPE DISCONNECTED. | F. {Mr Friese} 18 x 5.50 Rd R. {Sir Henry Royce} R. {Sir Henry Royce} 19 x 6.50 Track. 50 lbs. cold. 107 m.p.h. | 77 | 10 | 30 | 120°C. after 11 laps. Cont'd. {John DeLooze - Company Secretary} | ||