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).
Methods for testing radiator obstructions and cleaning the core with a chemical preparation.
| Identifier | ExFiles\Box 24\5\ Scan147 | |
| Date | 24th January 1928 guessed | |
| contd :- -2- of the radiator should then be filled as rapidly as possible. If water can be passed into the top tank more rapidly than it will flow out through the matrix, obstruction should be suspected. Another method is to remove the bottom water pipe having filled the system, a jet of water should then issue from the bottom orifice with a force to carry it approximately 18" horizontally as indicated in the attached sketch. The only accurate method of measuring small differences in radiators is by means of a venturi fitted in the bottom water pipe. This should be erected with its short end facing the front of the car and the U tube connections upwards. A U tube about 2 ft. high being filled with mercury to a depth of 1 ft. is required. The remainder of the U tube and the pipes (which are best standard 3/8 copper pipes with rubber joints at each end) connecting it to the venturi should be filled as far as possible with water. Attached is a sketch of a suitable venturi together with method of fixing up. Also the law of the venturi, and the average flow we expect to get in a standard system. We have indicated the flow below which abnormal restriction of some sort may be suspected. To restore the radiator core to its initial state of cleanliness, we have found that a preparation known as "Kleenwell" can often be used successfully. This mixture consists of about 90% caustic soda and 10% sodium cyanide. The method employed is to mix 2 lbs. of the preparation with a gallon of water and, having removed the radiator, shake it about contd :- | ||