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).
Road test results for the 20/25 HP Calorstat on different engine types and configurations.
| Identifier | ExFiles\Box 105\1\ scan0247 | |
| Date | 6th February 1936 | |
| Hs{Lord Ernest Hives - Chair}/Std.6/KW.6.2.36. 20/25 HP. Calorstat Road Tests. GUB-5 (Wor{Arthur Wormald - General Works Manager}'s Car). Large Bore Engine. Run over Six Hills course, without spring fitted in calorstat. Gave maximum temperature of approx. 85°C. for shutters to open under full speed conditions. Mean running temperature - (69 - 74°C.). 18-G-IV - Large Bore Engine. Run as above without spring fitted in calorstat. Gave maximum temperature of 90°C. for shutters to open under full speed conditions. Mean running temperature - 70 - 75°C. GAE-20. - Small Bore Engine. Run as above without spring fitted. Gave maximum temperature of 88°C. for shutters to open etc. Running temperature of approx. 72 - 76°C. GAE-20. Run as above with spring. Maximum temperature of 92°C. Running temperature of 80°C. | ||