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).
The design and benefits of thermostatically controlled radiator shutters and engine cooling improvements.
| Identifier | ExFiles\Box 39\4\ Scan218 | |
| Date | 11th January 1931 | |
| E.{Mr Elliott - Chief Engineer} HS.{Lord Ernest Hives - Chair} ) FROM R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer} ) (At Le CanadelHenry Royce's French residence.) X3499 R3/M11.1.31. C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} THERMOSTATICALLY CONTROLLED RADIATOR SHUTTERS. It has now been demonstrated that there is very little advantage in keeping down the water temperature, and we have now found a cause and cure for much of the water loss in - (1) The anti-spilling device which also can be used to raise the pressure and temperature before boiling. (2) Loss of water can now only take place when boiling. (3) Square tube radiator giving free-r water passage through radiator and reducing cavitation and loss of water through it being thrown out before rising to full boiling temperture. and although I believe that with exhaust heated throttle the water temperature is not of much importance, it does if kept high give hotter air under the bonnet, and effect carburation by the ingoing air being warmer. There are so many advantages in winter of increased heat to the carburation that we must do that is necessary to make the exhaust heat to the throttle jacket more constant, and it was suggested long ago that if we could make the flow too great we could check it at full throttle by a valve on the exit from the jacket. We may have patented it. Anyway it's a good idea, if, as Mr. Lovesey says, the twin jacket is so very effective. In conclusion, I agree to an average of 75oC. for the thermostat, but I want this on all cars ) USA. and European - and by proper liquid in the thermostat unit, not by spring. R.{Sir Henry Royce} | ||