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).
Results table from tests conducted at Brooklands on under-bonnet temperatures.
| Identifier | ExFiles\Box 94\3\ scan0227 | |
| Date | 25th June 1937 guessed | |
| (SHEET 5) RESULTS OF TESTS AT BROOKLANDS ON UNDER BONNET TEMPERATURES ETC. | CONDITIONS OF TEST | CAR SPEED & LOAD | AIR TEMP. DURING TESTS °C. | TEMP OF AIR PASSING FAN °C | TEMP. OF AIR AT PETROL PUMPS °C. | TEMP OF PETROL ENTERING PUMP °C | |--------------------------------------------------------------------------------------------|---------------------------|----------------------------|----------------------------|--------------------------------|---------------------------------| | STD. MATRIX. BONNET SHUTTERS CLOSED STD. FAN RADIATOR SHUTTERS FULL OPEN | IDLING STATIONARY | 19.0 | 85 | 65 | 39 | | | 40 M.P.H. FULL THROTTLE | — | — | — | — | | | MAX. SPEED FULL THROTTLE | 18.0 | 51 | 51 | 46 | | STD. MATRIX BONNET SHUTTERS OPEN. STD. FAN RADIATOR SHUTTERS FULL OPEN | IDLING STATIONARY | 18.0 | 80 | 57 | 26 | | | 40 M.P.H. FULL THROTTLE | 16.5 | 54 | 54 | 41 | | | MAX. SPEED FULL THROTTLE | 18.0 | 48 | 48 | 42 | | STD. MATRIX BONNET SHUTTERS OPEN 5 BLADE FAN 1 . 1/1 RATIO. RADIATOR SHUTTERS OPEN | IDLING STATIONARY | 22.0 | 73 | 60 | 39 | | | 40 M.P.H. FULL THROTTLE | 24.0 | 59 | 58 | 49 | | | MAX. SPEED FULL THROTTLE | — | — | — | — | | STD. MATRIX LOUVERED BONNET. 5 BLADE FAN 1 . 1/1 RATIO. RADIATOR SHUTTERS OPEN | IDLING STATIONARY | 22.0 | 70 | 55 | 36 | | | 40 M.P.H. FULL THROTTLE | — | — | — | — | | | MAX. SPEED FULL THROTTLE | 22.0 | 50 | 47 | 36 | | STD. MATRIX BONNET SHUTTERS OPEN 5 BLADE FAN 1/1 RATIO RADIATOR SHUTTERS OPEN. | IDLING STATIONARY | 24.0 | 75 | 61 | 41 | | | 40 M.P.H. FULL THROTTLE | 24.0 | 58 | 56 | 48 | | | MAX. SPEED. FULL THROTTLE | 21.5 | 51 | 49 | 38 | | MATRIX WITH AIR SLOTS BONNET SHUTTERS OPEN 5 BLADE FAN 1/1 RATIO. RADIATOR SHUTTERS OPEN. | IDLING STATIONARY | 24.0 | 71 | 58 | 45 | | | 40 M.P.H. FULL THROTTLE | 22.0 | 56 | 54 | 46 | | | MAX. SPEED FULL THROTTLE | 21.0 | 53 | 47 | 37 | | STD. MATRIX. BONNET SHUTTERS OPEN. 5 BLADE FAN. 1/1 RATIO. RAD. SHUTTERS COUPLED TO CALORSTAT | 55 M.P.H TOURING | 24.0 | 62 | 56 | 46 | | | MAX. SPEED. FULL THROTTLE | 25.0 | 58 | 56 | 51 | | MATRIX WITH AIR SLOTS BONNET SHUTTERS OPEN 5 BLADE FAN. 1/1 RATIO RAD. SHUTTERS COUPLED TO CALORSTAT | 55 M.P.H. TOURING | 22.0 | 54 | 48 | 44 | | | MAX. SPEED. FULL THROTTLE | 21.0 | 53 | 47 | 37 | NOTE:- THE PETROL FEED TEMPERATURES DO NOT CONVEY MUCH OWING TO VARIATIONS DUE TO QUANTITY OF PETROL IN TANK, WIND, ETC. | ||