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).
Valve clearance measurements with an aluminium head for a Phantom engine.
| Identifier | ExFiles\Box 66a\2\ scan0082 | |
| Date | 19th May 1928 | |
| To H.S. Phantom X8060 19/5/28 Re Valve clearance with Aluminium Head. We find that the average increase in rocker clearance between the valves fitted to the aluminum head is .002" when hot. The temp. have been max. 90°c min. 14°c G H Hancock | ||