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 oil flow, bearing clearances, and a new type of cast-iron material from Detroit.
| Identifier | ExFiles\Box 173\4\ img178 | |
| Date | 24th December 1935 | |
| -3- After a considerable amount of testing, Hopkins says that the oil flow in an engine at 2,500 r.p.m., should be 30 gallons per minute per square inch bearing clearance. By clearance is meant the sum for all the bearings of twice the perimeter times the annular gap. He introduced me to a Mr. Brown of Detroit, who owns all the patents on a new type of cast-iron, which has the unusual properties of melting at 1950°F.{Mr Friese} and possessing a Rockwell hardness of 70. This metal can therefore be cast into steel liners, and wears much better than any existing cylinder material. It also has the property that if run against itself dry and unlubricated, it does not seize but slowly wears away. If we send drawings to Detroit of either SpectreCodename for Phantom III cylinder liners, or some such part as the shock absorber piston, the manufacturers will be delighted to make up parts in this new material. Hs{Lord Ernest Hives - Chair}/Cry. | ||