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).
Continued report on various engine component tests including induction pipes, carburettors, and valves.
| Identifier | ExFiles\Box 181\M13\M13.2\ img101 | |
| Date | 24th September 1931 | |
| -2- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6/WJ.24.9.31.Cont'd.{John DeLooze - Company Secretary} Induction Pipe Capacity. Rm.{William Robotham - Chief Engineer}37. Is a confirmatory test of induction pipe capacity effect. Effect of Carburetter Position. Rm.{William Robotham - Chief Engineer}38. Shows the characteristic power curve obtainable with this camshaft with single and double Claudels. Solex Carburetter. Rm.{William Robotham - Chief Engineer}28. Gives the best power we can get on the standard 1 5/8 throttle diameter Solex compared with expanding carburetters. The Solex was fitted with the largest choke provided. It had no accelerating pump. The performance on the road is poor for snap opening up. Clearance Round Inlet Valve and Valve lift. During these tests values were obtained for increasing the clearance round the inlet valve and the value of high lift rockers in conjunction with this modification. We are continuing the tests with various timings etc., and also confirming the results before reporting more fully on the subject. Briefly, so far it does not appear that with the 112° shaft the power output will be raised on the 'Japan' head by more than about 5% with low lift rockers or 2 1/2% with high lift rockers when the clearance round the inlet valve is increased. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Curves 28, 29, 30, 34, 35, 37, 38 Attached. Also two photographs. | ||