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 rig setups for various automotive components including valves, oil pumps, and air cleaners.
| Identifier | ExFiles\Box 159\6\ scan0085 | |
| Date | 25th August 1940 | |
| Rm{William Robotham - Chief Engineer}/GB.1/ET.25.8.40 - 3 - The thought of using the wind tunnel for aerodynamic tests on 1/8 size models of cars has occurred to us. The small size of the tunnel (2 ft. sq.) might make the value of the results rather problematical. RIG FOR ENDURANCE TESTS ON VALVES, SPRINGS AND SEATS - This rig will consist of a variable speed 10 H.P. motor driving the camshaft, valve gear and oil pump fan engine. Note your remarks re hot testing. Is there any reason why all fatigue tests on valve springs should not be done hot. The engine oil temperature of cars on continental running reaches 135° C. The valve springs may run hotter than this. On a test rig the oil temperature could be maintained by a thermostatically controlled electric heater and sufficient oil thrown on to the valve springs to ensure them being at oil temperature. What are the usual temperatures at which hot testing is done? In your notes on a visit to the Eaton Mfg. Co., April 18, 1940, you say that valve spring surge tests are no longer done on single cylinder slices driven by electric motor, but are done on complete engines run on a dynamometer. What is the reason for this change? Is every cam done on the complete engine or only one pair? What is the double log stress life line? OIL PUMP PERFORMANCE AND ENDURANCE TEST - This will be a straightforward rig with provision for driving the oil pump at four different speeds and measuring the delivery at various pressures and temperatures. AIR CLEANER TEST RIG - Air cleaners are to be tested. The data required are:- 1. Depression produced by full throttle when clean. 2. Ditto at various stages of dirtiness. 3. Efficiency as an air cleaner. The efficiency of the cleaner will be judged by passing the air from the cleaner to an Air Maze oil bath type filter. This will receive a visual inspection after the test (see sketch). Can the quantity of dirt in the air cleaner be determined by careful weighing? In cleaners in which the filter material is dipped in oil, evaporation might be serious. In cloth filters humidity might affect the weight. It is probably possible to overcome both of these errors by putting two similar filters in series and working on weight differences between the two. | ||