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).
Comparison of engine water heat-up times with different thermostat bye-pass settings.
| Identifier | ExFiles\Box 78\1\ scan0066 | |
| Date | 12th June 1920 guessed | |
| Engine run with car standing at 1000 R.P.M. - no load. Comparative Times taken by heat up water. | Temp. | Standard car - no Thermostat or blanking plates. | Thermostat fitted .062" bye-pass. | Thermostat fitted .100" bye-pass. | Thermostat fitted .187" bye-pass. | |---|---|---|---|---| | 17° | Start. | Start. | Start. | Start. | | 50° | 2mins. 49 secs. | 1 min. 35 secs. | 1 min. 40secs. | 1 min. 55 secs | | 60° | 6 " 23 " | 2 " 18 " | 2 " 18 " | 2 " 53 " | | 70° | 23 " 2 " | 3 " 3 " | 3 " 7 " | 4 " 22 " | | 80° | 71°C max. Temp. | 4 " 17 " | 4 " 28 " | 8 " 6 " | Temperature measured with thermometer in standard position on top water pipe. Hs.{Lord Ernest Hives - Chair} | ||