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).
Recommending the standardisation of the calorstat spring on Bentley cars to regulate water temperatures.
| Identifier | ExFiles\Box 87\1\ scan0205 | |
| Date | 4th February 1937 | |
| 240 To By from Rm{William Robotham - Chief Engineer}/Std. c to E.{Mr Elliott - Chief Engineer} c to D.A. c to M.X. Rm{William Robotham - Chief Engineer}/Std.5/M.4.2.37. Bentley Water Temperatures. We understand from Mx{John H Maddocks - Chief Proving Officer} that the average Bentley production chassis water temperature is in the region of 70° C, the thermometer reading having been decreased somewhat when the water hole drilling of the cylinder head was altered - previously the thermometer reading had always been about 5°C higher than the top tank temperature. We carried out some tests some months ago on this subject and the results are shown on attached sheet. The average and maximum running temperatures are shown on a Bentley car with and without a calorstat spring (of the type used on PhIII and lately 25/30 HP cars) fitted loads to open and close the shutters and calorstat loads obtainable are also shown. As a result of those tests, we recommend that the calorstat spring to E83210 should be standardised on Bentley cars at once, thus bringing the three cars, PhIII, 25/30 and Bentley into line. We are circulating a standardisation sheet for this purpose and 3BIV car is fitted with such a spring for its coming 15000 mile run, while such a spring was fitted to 6BIV in its last 15000 miles test run. Rm{William Robotham - Chief Engineer}/Std. | ||