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 on alternative thermostat schemes for a Bentley car to reduce costs.
| Identifier | ExFiles\Box 156\1\ scan0215 | |
| Date | 9th July 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Std. 1328 Rm{William Robotham - Chief Engineer}/Std.1/AP.9.7.37 BENTLEY WATER TEMPERATURE REGULATING THERMOSTAT - SCHEME FOR REDUCED COST. We have completed tests on 3.B.1V. car on the Bentley thermostat scheme to LeC.5655 and have tested two alternative schemes. (1) Exactly as shown on LeC.5655. (2) A scheme which utilises the cylinder head end outlet and thermostat casing detailed for LeC.5655 with a different thermostat (to B.G.A.2013A.) with a plain valve, and a permanently open bypass. This bypass goes to the water pump inlet via the induction pipe hot spots and takes the place of the usual hot spot water feed. Tests on Scheme (1) above indicate that it is impossible to avoid sticking of the valve head in its guide and yet retain reasonable operation and warming up - we are therefore abandoning the scheme as drawn. Scheme (2) as tested gives promising results but as tested it is under the disadvantage of having too small a bypass pipe i.e. 3/8" owing to the size of unions available in the induction pipe hot spots etc. We therefore wish to run on 6.B.1V. car a scheme similar to that described in (2) above, but with an adequate size of bypass pipe - .500 pipe. Such a scheme is shown on Rm.{William Robotham - Chief Engineer}412 attached - in order to simplify and cheapen the scheme we have connected the two hot spots with a cored passage. Will you please detail and make the necessary new parts for this scheme as soon as possible, so that we can test this scheme and recommend its adoption for Bentley III. Rm{William Robotham - Chief Engineer}/Std. | ||