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).
Future testing procedures for pistons, including hardness checks at various points.
| Identifier | ExFiles\Box 86\2\ scan0082 | |
| Date | 18th October 1933 guessed | |
| -3- similar to that now used on production (i.e. EB.1025) and they are quite alright having done many hard runs on the road and at Brooklands, these pistons of course had the standard heat treatment. For our future tests on pistons, do you agree that before running we check over all dimensions and make a record of Brinell hardness numbers at different points such as :- (1) Base of skirt. (2) Top of skirt. (3) Bottom piston ring land. (4) Top piston ring land. (5) Crown. No's (1) & (2) should be taken on both the split side and pressure side of the piston. These dimensions and hardness numbers could be checked after the running in period and then periodically throughout the run. This may give us some information on why the crown came adrift from the rest of the piston on the 10,000 miles car. We also ought to know the Brinell number of the piston material before heat treatment. Hs{Lord Ernest Hives - Chair}/R.Matthews. | ||