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).
Engine valve timing variations and gear rattles.
| Identifier | ExFiles\Box 33\4\ Scan075 | |
| Date | 9th September 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Expl. No. 4226 REF: Hez/A M C/9.9.23. Variation in Timing. As the engine speed is increased, the valve timing becomes slightly later. Maximum variation from 500 - 3000 r.p.m. is 3°. Gear Rattles. As long as damping springs are used, the timing does not vary more than stated above, but when the damping springs are removed, gear rattling takes place at low speeds and the camshaft oscillates as much as 6° measured on flywheel i.e., 3° on Camshaft. The results give an indication that the power required to turn the Camshaft is very small. Hs.{Lord Ernest Hives - Chair} [Faint Watermark Text] DICKINSON BOND 1804 MADE AT CROXLEY | ||