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).
Engine cooling with Glycol, operating temperatures, detonation, and supercharger issues.
| Identifier | ExFiles\Box 173\2\ img168 | |
| Date | 21th February 1934 guessed | |
| 8. Seems absurd but it apparently is so as it was confirmed in course of conversation though what sort of grand puckering was inside on the Allison engine I do not know. They seem to be able to run at 180 M.E.P Glycol cooled at 300°F.{Mr Friese} before bad audible detonation sets in but what that means I dont know. At present having minor troubles with supercharger. Have done no endurance. I confirmed that my specification for Glycol Radiator solder was O.K. They are now considering here that 300°F is too hot to run glycol cooling as with this they get hot spots as warm as in the air cooled. Are therefore dropping to 250°F they think. | ||