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).
Findings from tests comparing Glycol and water as engine coolants, noting temperature issues, flow reduction, and plans for further development.
| Identifier | ExFiles\Box 54\4\ Scan105 | |
| Date | 9th August 1934 | |
| -2- Hs {Lord Ernest Hives - Chair} /Ryce.5/MJ.9.8.34. Cont'd. {John DeLooze - Company Secretary} (c) (Fig.3) At 135°C. inlet Glycol temperature, either slight preignition, or detonation, sets in on No.5 cyl. causing a sharp rise in temperature. On richening up this temperature falls to normal with only a very slight change in temperature on the other cylinders. From Fig.5. (a) Under the same conditions there is a 6% reduction in volume flow due to the change from water to Glycol cooling (b) The rate of flow is independent of the coolant temperature as long as there is no vapour formed. (c) The unduly large drop in flow evaporatively cooled is due to the outlet being restricted by fishtails. (d) Preliminary tests, with the top joint couples only, shewed no change in temperature on reducing the flow to 35 gallons/min. both water and Glycol cooled at 85°C. inlet but the difference between water and Glycol still remained. (e) The drop in power Glycol cooled compared with water cooled would appear to bear out the thermocouple results. The drop with temperature has been confirmed on the six cylinder naturally aspirated. FURTHER DEVELOPMENT. Further tests on these lines are to be carried out on the single cylinder unit, on some special category tests, and with different cylinder blocks on the six cylinder unit. If possible tests will be carried out to determine the intrinsic cooling capacity of water and Glycol when in contact with a hot surface. Hs {Lord Ernest Hives - Chair} /H.S.Royce. | ||