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).
Analysis of engine bore wear, comparing Midland cylinder blocks to in-house blocks and noting the effects of ventilation.
| Identifier | ExFiles\Box 132\4\ scan0072 | |
| Date | 27th May 1937 guessed | |
| 31 type on 20/25, bore wear increased. This indicates insufficient crankcase ventilation. Comparing the recent 15,000 miles tests of 6BIV & 3BIV, the midland Cylinder Co's block on 3BIV shows better wear than our own on 3BIV. Midland Cyl Co. - .0000885/1000 miles RR Block (6BIV) (B.4 Unit) = .0001845/1000 miles On previous test B.22 in 6BIV using our own cylinder iron had lower wear than either being .0000568/1000 miles. The midland Cyl. Co block was used on engine having considerably more oil thrown into the bore & a considerable amount of top lubrication apparently since the oil consumption has improved considerably since the breather pipe from the rocker cover has been | ||