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 of results for under-bonnet temperature tests under various car configurations and road conditions.
| Identifier | ExFiles\Box 94\3\ scan0120 | |
| Date | 9th December 1936 | |
| RESULTS OF UNDER-BONNET TEMPERATURE TESTS. (1) AVERAGE TEMPERATURES. Condition of car under test. | Road Conditions of 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 | 56.5 | 48.5 | 34.5 | 78.0 | 10 (2) Shutters fixed open -otherwise standard. | Touring | 45.0 | 42.0 | 32.0 | 69.8 | 10 (3) Shutters open, no side-guards. | Touring | 40.5 | 37.5 | 30.5 | 62.0 | 10 (1) As standard. | Full speed. (over approx. 80 miles) | 51.5 | 42.0 | 35.5 | 80.0 | 10 (2) Shutters Open, otherwise stand: | Full speed. (over approx. 80 miles) | 44.0 | 39.0 | 32.5 | 72.5 | 10 (3) Shutters open No side-guards. | Full speed. (over approx. 80 miles) | 42.5 | 38.5 | 29.5 | 72.0 | 10 (1) As Standard | Traffic. | 63.0 | 52.5 | 40.0 | 79.0 | 10 (2) Shutters Open otherwise Std. | Traffic. | 58.0 | 51.0 | 40.5 | 75.0 | 10 (3) Shutters open no side-guards. | Traffic. | 58.0 | 50.0 | 38.5 | 73.5 | 10 | ||