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).
Cooling tests carried out on car 3.B.IV at the Montlhery track.
| Identifier | ExFiles\Box 82\5\ scan0020 | |
| Date | 4th March 1937 | |
| 200a To E.{Mr Elliott - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} c. to Da.{Bernard Day - Chassis Design} REPORT ON COOLING TESTS CARRIED OUT ON 3.B.IV. CAR AT THE MONTLHERY TRACK. Purpose of Tests. The tests which are described in this report were carried out in order to determine - (1) The effect on the cooling of the dummy shutter radiator grille which Messrs John Marston Ltd. have made for us, and which has been approved from an appearance standpoint by Sales officials. (2) The degree of cooling which would be obtained with a 52.M.M. deep Mk.VI. core instead of the present 58 MM. Mk.V. (3) The degree of cooling available on the present standard 4½ litre Bentley. Tests Carried Out. These followed our usual procedure on cooling tests i.e. critical air temperatures were determined at 30 M.P.H., 45 M.P.H. and maximum speed under full throttle conditions (by means of towing at the lower speeds) - as the Brooklands track was not available for testing the figures were obtained on the Montlhery track. All results obtained are shown on attached sheet. Note all tests were carried out with a thermostat casing water outlet fitted, but with thermostat valve removed. Conclusions from Tests. (1) Owing to the fact that some of the tests had to be carried out without headlamps while these were being modified, tests 4, and 5, and 10, and 11, on attached sheet were compared to see if this effected the results - from the test figures it is seen that the headlamps make no appreciable difference to the cooling. (2) Comparing tests results 1,2, 3 with 5,6,7, it is seen that the dummy shutter grille results in a large decrease of cooling - 15% at 30 M.P.H. and 19% at maximum speed. (3) From tests 5,6 and 7 it is seen that the 52 MM. Marston | ||