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).
The condition of tappets after endurance tests at 3500 and 4000 R.P.M.
| Identifier | ExFiles\Box 96\2\ scan0264 | |
| Date | 2nd November 1937 guessed | |
| -3- 1 Hours endurance at 3500 R.P.M. Tappet Nos. | Condition of Tappets. --------------------|------------------------------------------------ A.9,12. B.1,5,8. | Lightly scratched. Groove hardly perceptible. B.12. | Scratched surface Groove hardly perceptible. A.1,5,8. B.9. | Lightly scratched Groove .025" wide. B.11. | Scratched Groove .025" wide. A.2. B.10. | Lightly scratched Groove .050" wide. B.2. | Scratched Groove .050" wide. A.6. | Good surface Very bad groove .100" wide. A.7,10. | Lightly scratched Very bad groove .100" wide. A.11. B.6,7. | Scratched Very bad groove .100" wide. 1 Hours endurance at 4000 R.P.M. B.8,9. A.12. | Good surface Groove hardly perceptible. B.12. | Lightly scratched Groove hardly perceptible. B.1. | Scratched Groove hardly perceptible. A.5,8. | Good surface Groove .025" wide. A.9. | Lightly scratched Groove .025" wide. A.1. B.11. | Scratched Groove .025" wide. B.5. | Lightly scratched Groove .050" wide. A.2. | Scratched Groove .050" wide. A.10,11. B.10. | Scratched. Series of 3 grooves .075" wide A.7. B.2. | Good surface, badly grooved .100" wide. B.6,7. A.6. | Scratched surface. | ||