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).
Engine roughness solutions and testing of stellited exhaust valves.
| Identifier | ExFiles\Box 82\3\ scan0376 | |
| Date | 7th June 1935 | |
| -4- Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} 9/KW. 7.6.35. Engine Roughness. Hancock seems to have demonstrated that with the power output we are at present obtaining from the engine, we require more load on the slipper wheel in order to get the required engine smoothness. This definitely confirms some tests we have been doing here, and we have asked the design for more inertia. Hancock has been running cork inserted friction material, and is satisfied that this gives more consistent results than cotton duck and enables a high friction load to be used. We consider that any new design of slipper wheel should permit of cork inserted friction plates being used. Stellited Exhaust Valves. For the first time we have run stellited exhaust valves on this car on a 15,000 miles test. The valves are in the best condition of any we have ever seen in spite of the fact that they were run at .004" tappet clearance for a considerable period. It appears to us that stellited exhaust valves would be a great asset in maintaining the tune of the Bentley car. G.W.H's full report on the test will of course follow in the ordinary way. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||