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).
Methods for controlling engine water temperature, comparing a bye-pass system to louvres, and the fitting of primers.
| Identifier | ExFiles\Box 39\4\ Scan030 | |
| Date | 25th July 1919 | |
| To EH. from R.{Sir Henry Royce} c. to CJ. R7/G25.7.19. X.3499 ✓ X.3563. X.1899. RE MEANS OF CONTROLLING WATER TEMPERATURE (EH3/LG22.7.19.) I am very interested and pleased with your remarks on the various points of water temperature, and the starting of existing cars, and have suggested that the bye-pass system should be thoroughly tested before fitting the louvres. I do not, however, think there is much difference in the time necessary to heat the water in our present 40/50 H.P. engine, whether it includes the radiator water or not, as the radiator water is such a small percentage of the total. In the 20 H.P. and thr new 50 H.P. we assume that thr quantity of water carried in the engine will be considerably less, and therefore the time necessary to heat up the cylinders will be much less, if we do not include the radiator. With a bye-pass system it will always be necessary to take care that the radiator does not freeze, and also the various parts under the bonnet which are not water heated, or heatedby the exhaust gases, will be relatively cold with the bye-pass system compared with the louvred system. This is one of the disadvantages which we shall have to watch, especially in very cold climates. Regarding the fitting of primers to existing cars, I certainly think this is very desirable, and agree with you that we ought to press the advisability of fitting these whether the customer has a self starter fitted or not. R.{Sir Henry Royce} | ||