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).
The flow of water through an engine with and without a thermostat fitted at various engine RPMs.
| Identifier | WestWitteringFiles\D\April1920\ Scan18 | |
| Date | 24th April 1920 | |
| To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c.c. to CJ c.c. to BH c.c. to EE c.c. to Da.{Bernard Day - Chassis Design} c.c. to HY.{Tom Haldenby - Plant Engineer} EFC [STAMP] ORIGINAL [STAMP] EFC APR 24 1920 Hs{Lord Ernest Hives - Chair}2/LGS.4.20. X.3563. THERMOSTAT CONTROL FOR WATER TEMPERATURE. [STAMP] RECEIVED We have measured the flow of water through the engine with and without a Thermostat fitted. Following are the results:- FLOW OF WATER THROUGH ENGINE GALLONS PER MINUTE. | Engine revs. | Std. Car. | Thermostat fitted - valve open. | Thermostat fitted - valve closed. | |--------------|-----------|-----------------------------------|-------------------------------------| | 500 | 8.0 | 6.7 | 3.5 | | 1000 | 12.0 | 11.65 | 9.5 | | 1500 | 17.8 | 16.5 | 13.0 | | 2000 | 22.5 | 20.5 | 16.0 | We consider the results show that there is no cause for anxiety as regards the effect of fitting a Thermostat will have on the rate of flow of water through the engine. With the valve closed on the Thermostat we certainly get an appreciable drop in the flow but when in this condition the engine would be cool and could stand the reduced flow. The condition we want the maximum flow is when the engine is hot and is liable to form steam pockets. Under that condition it will be seen the flow is practically the same as a standard car. Hs.{Lord Ernest Hives - Chair} | ||