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).
Table showing the results of under-bonnet temperature tests under different car and road conditions.
| Identifier | ExFiles\Box 94\3\ scan0121 | |
| Date | 9th December 1936 | |
| RESULTS OF UNDER-BONNET TEMPERATURE TESTS. (1) MAXIMUM TEMPERATURES. Condition of Car under test. | Road conditions under test. | Temp. behind Fan °C. | Temp. at Petrol Pump °C. | Temp. of petrol (liquid) Feed to Pump °C. | Temp.of Water °C. | Temp.of Atmosphere °C. (1) As Standard. | Touring. | 61.5 | 51.5 | 41.5 | 81.0 | 10 (2) Shutters Open - otherwise Std. | Touring. | 49.0 | 43.5 | 33.5 | 69.5 | 10 (3) Shutters open - no side-guards. | Touring. | 44.5 | 39.5 | 33.5 | 66.0 | 10 (1) As Standard. | Full Speed. (over approx. 30 miles) | 53.0 | 43.5 | 38.0 | 84.5 | 10 (2) Shutters Open - otherwise Std. | Full Speed. (over approx. 30 miles) | 48.0 | 40.5 | 33.0 | 75.5 | 10 (3) Shutters Open - no side-guards. | Full Speed. (over approx. 30 miles) | 45.0 | 40.5 | 32.0 | 76.5 | 10 (1) As Standard. | Traffic | 67.5 | 55.5 | 41.5 | 82.0 | 10 (2) Shutters open - otherwise Std. | Traffic | 65.0 | 55.0 | 41.5 | 80.5 | 10 (3) Shutters open - no side-guards. | Traffic | 63.5 | 53.5 | 39.5 | 78.0 | 10 | ||