The performance and wear of components including manifold studs, brakes, dampers, and servo linings.
| Identifier | ExFiles\Box 7\1\ 600b 27 G V1 Mx Car-page90 | |
| Date | 20th April 1939 guessed | |
| -3- Investigation shows that the corrugations flatten out under the combined effect of heat and pressure, this allows the bolts to become slack and the joints eventually blow out. We are trying a set of corrujoints which have been previously annealed and compressed in conjunction with longer bolts to give increased elasticity. The clearance between exhaust pipe and rearmost hole in cruciform has decreased from .460 to .125. One of the long studs in 3% nickel fitted to outer flanges of manifold broke at 24,558 miles. A similar set have run more than 30,000 miles on 8.B.V. in France. Previously the original short type studs have failed at a mileage of about 5,000 on 27.G.V1. 8.B.V. and Sg {Arthur F. Sidgreaves - MD} 's car WXA.1. It will be seen therefore that the long stud represents a considerable improvement. We may have to recommend that these studs be replaced by new ones after 30,000 miles service. Brakes. Combination of Thermoid and Ferodo R.L. Effective and have been free from squeaking until a few days ago when occasional squeaks have been heard from the rear brakes. Mileage... 14,907 With materials previously used squeaks have developed at 5,000 miles. The Armstrong hydraulic damper deleting friction device on swinging arm continues to be very good in operation. There are no brake thumps and no clanking from front brakes on release. Servo lining in R.A.D.13 material. Groans pulling up at low speeds developed after a mileage of 16,940. The servo was dismantled for examination, and the friction surfaces of the R.A.D.13 material were found to be coated with patches of compressed dust from the material itself. The dust was removed and servo has since run 4,832 miles without any sign of noise. | ||
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).