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 of cooling tests on a 4 1/4 Litre car at Brooklands.
| Identifier | ExFiles\Box 87\1\ scan0228 | |
| Date | 10th May 1937 guessed | |
| RESULTS OF COOLING TESTS ON B 56 BN{W.O. Bentley / Mr Barrington} CAR (STD. 4 1/4 LITRE) AT BROOKLANDS. AVERAGE OUTLET WATER TEMP - 70°C AVERAGE TEMP RISE ACROSS ENGINE (A) 30 M.P.H. - 11.1°C (B) FULL SPEED (APPROX.) - 10.7°C AV. AIR TEMP - 14°C AV. FULL SPEED LAP SPEED - 86.3 M.P.H. BEST 1/2 MILE SPEED - 90 M.P.H CONDITIONS OF TEST. (1) PRESENT STD. RADIATOR (58 MM MK V) AND SHUTTERS FULL OPEN (2) 58 MM MK VI LIGHTENED MATRIX & SHUTTERS FULL OPEN (3) AS (2) BUT SHUTTER ANGLE 54° (4) AS (2) BUT SHUTTER ANGLE 51° (5) AS (2) BUT SHUTTER ANGLE 48° (6) 52 MM MK VI LIGHTENED MATRIX & SHUTTERS FULL OPEN (7) AS (6) BUT SHUTTER ANGLE - 54° (8) AS (1) (9) AS (2) (10) AS (3) (11) AS (4) (12) AS (5) (13) AS (6) (14) AS (7) TEMP UNDER BONNET BEHIND FAN. 33 39 44 49 49 41 46 29 33 39 41 41 35 38 CRITICAL AIR TEMP (CORRECTED TO 100°C OUTLET TEMP) °C. 42.2 43.9 41.9 40.6 38.8 46.4 40.9 45.5 46.0 40.0 35.5 33.5 45.5 39.5 SPEED (M.P.H) (ALL TESTS FULL THROTTLE) 30 30 30 30 30 30 30 86.46 86.32 85.87 86.60 86.17 86.25 86.02 | ||