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 results for corrugated metal joint washers and a special front bumper bar.
| Identifier | ExFiles\Box 83\2\ scan0305 | |
| Date | 13th March 1938 | |
| ( II ) Parts. Result of Test. Corrugated Metal Joint Washers in spherical joint between exhaust manifold and downtake pipe. These were satisfactory but did not cover the whole mileage undisturbed, as it was necessary to dismantle the front expansion box on several occasions. It was found easier and quicker to make a gas-tight joint with these washers and they obviated the necessity of lapping in the spherical joint. They should be recommended for production. Special Wilmot-Breeden Front Bumper Bar 5,600 miles. No trouble Experienced. | ||