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).
Test results showing the operation of engine shutters under various heating and cooling conditions.
| Identifier | ExFiles\Box 39\4\ Scan071 | |
| Date | 20th March 1934 guessed | |
| 2. Details of Tests showing the operation of the Shutters under various conditions. Car Stationary with engine running at 1000 R.P.M. Atmosphere - 15°C, Fan belt removed. 1. Heating up test. Starting from cold, shutters commence to open at 77°C, at 80°C they are at an angle of 30°, at 82°C the angle is increased to 45°, at 85°C = 67° & at 100°C the maximum movement of 70° is reached. Time from shutters starting to open till boiling = 6 min. 2. Cooling down test. Cold Water added, engine still running, at drain cock. Shutters commenced to close when temperature of 82°C was reached, & gradually followed the drop in temperature until they closed at 73°C. 3. Car stationary, engine switched off with at water temperature of 80°C, & allowed to stand & cool down. Readings taken of temperature at cylinder head, & position & angle of Shutters, (Atmos. = 15°C.) every 5 minutes. Time in Minutes | Shutter Position | Temperature at 1. cy. head | 2. Thermostat --- | --- | --- | --- Engine running | 20° | 81°C | 69°C after 5" standing | 35° | 77 | 75 " 10 " | 45° | 74 | 73 " 15 " | 37° | 71 | 72 " 20 " | 17° | 68.5 | 70.5 " 25 " | 5° | 65.5 | 69 " 30 " | Closed | 65 | 68.5 Engine was then started up, run for 2 minutes, when the temperatures were:- Cy. head: 68°C. Thermostat: 65°C. | ||