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).
Tests at Brooklands on a 6.B.1V car fitted with a Marston dummy shutter and thermostat for the M. series Bentley.
| Identifier | ExFiles\Box 156\1\ scan0263 | |
| Date | 20th September 1937 | |
| To By. {R.W. Bailey - Chief Engineer} from Rm {William Robotham - Chief Engineer} /Std. c. Da. {Bernard Day - Chassis Design} c. Hs. {Lord Ernest Hives - Chair} c. MX. {John H Maddocks - Chief Proving Officer} REPORT ON TESTS CARRIED OUT ON BROOKLANDS WITH 6.B.1V. CAR FITTED WITH MARSTON MADE DUMMY SHUTTER ASSEMBLY AND THERMOSTAT SCHEME TO Rm. {William Robotham - Chief Engineer} 415 These tests were carried out in order to settle finally whether the cooling system which is to be standardised for M. {Mr Moon / Mr Moore} series Bentley is satisfactory. TESTS 6.B.1V. car fitted with the final set of Marston Dummy shutters and thermostat scheme to Rm. {William Robotham - Chief Engineer} 415 was driven under full throttle and full speed conditions at Brooklands track and (a) the critical air temperature under these conditions was determined with thermostat held full open (b) max. temperature reached, with thermostat operating normally (58.MM. Mk.Vl. {V. Lewis / Mr Valentine} .005 and .003 tinned strip matrix used as std. production for M. {Mr Moon / Mr Moore} series) was recorded. RESULTS OF TESTS. Shown on attached sheet (1), including figures obtained on run to track.. CONCLUSIONS (a) The car is adequately cooled with the Marston dummy shutter assembly and the Mk.Vl. {V. Lewis / Mr Valentine} 58 M.M. matrix which we are standardising for M. {Mr Moon / Mr Moore} series. (b) The operation of the thermostat was satisfactory until the bellows failed during Brooklands running - this failure has been taken up with the makers and their explanation was that the thermostat bellows units had not been built up in their production line where they have perfected their technique for soldering the bellows plates to the bellows, and also that the bellows were plated, departing from their standard article - it was at the soldered junction that the leak occurred. We have now obtained unplated production built units and one of these will be running in 6.B.1V. in France, meanwhile we are running them in other cars here. Other users such as Vauxhall Motors Ltd., state that failures are less than 0.5% (Messrs Rovers also quote a figure of less than 0.5% failures.) continued | ||