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).
Modifications to the camshaft casing and valve springs to allow the engine to run at 4,000 rpm.
| Identifier | ExFiles\Box 48\4\ Scan046 | |
| Date | 10th February 1920 | |
| R.R. 235 a (100) T. (R.F. 816. 6-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460. -2- E2/G10.2.20. Contd. 2 BA spanner. It may be necessary to provide a special key for rotating the tappet screw. The camshaft casing itself, together with the box which encloses the valve springs and rockers, have been altered somewhat in shape and position, and the valve springs have been increased in diameter, these latter being carried out to keep the stress range low in a spring which is sufficiently powerful to allow the engine to run at 4,000 revs. per minute without the rockers leaving the cams. [Watermark: DICKINSON & SON LTD POST 1804 MADE AT CROXLEY E.{Mr Elliott - Chief Engineer}] | ||