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).
Photographic comparison of a Rear Main Bearing and a No.4 Big End Bearing after a test run.
| Identifier | ExFiles\Box 115\1\ scan0201 | |
| Date | 27th November 1936 guessed | |
| B.17 REAR MAIN BEARING - R.R.56 Alloy NO.4. BIG END BEARING - A.C2 Alloy. RUNNING TIME:- 20 Hrs. light running 1 Hr.30 mins full load 2000-4000 R.P.M. 5 mins. 1/4 load at 4000 R.P.M. 2 | ||