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).
Comparative test of engine water heat-up times with various thermostat bye-pass configurations.
| Identifier | WestWitteringFiles\E\June1920\ Scan2 | |
| Date | 7th June 1920 guessed | |
| Engine run with car standing at 1000 R.P.M. - no load. Comparative Times taken to 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. | |---|---|---|---|---| | 17º | Start | Start | Start | Start. | | 50º | 2 mins. 49 secs. | 1 min. 35 secs. | 1 min. 40 secs. | 1 min. 55 secs | | 60º | 6 " 23 " | 2 " 18 " | 2 " 18 " | 2 " 53 " | | 70º | 23 " 2 " | 3 " 3 " | 3 " 7 " | 4 " 22 " | | 80º | 71ºC max. temp. | 4 " 17 " | 4 " 28 " | 8 " 0 " | Temperature measured with thermometer in standard position on top water pipe. Hs.{Lord Ernest Hives - Chair} | ||