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).
Note with a diagram detailing oil levels, gradients, and clearances in crank chambers for a specific test.
| Identifier | ExFiles\Box 16\1\ Scan009 | |
| Date | 1st January 1907 guessed | |
| Y740 1400 Oil in crank chambers. (Test on 60547). up to overflow. 7 pints. plug projects 5/8" this crank come. Gradient. [Diagram with dimensions] l" 3 1/2" hole. < 6 1/2" > > 1 1/4" > 2 3/4" Big end projects 4 1/4" inches. (maximum) where big end works. Gradient = 1 in 7.25 | ||