Rolls-Royce Archives
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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}
  
  


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