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).
Reversion of inlet and exhaust valve diameters for the Wraith III model.
| Identifier | ExFiles\Box 10\3\ 03-page151 | |
| Date | 24th June 1938 | |
| 654 SWDL{Len H. Swindell} File BY.15/G.24.6.38. WRAITH III. CYLINDER HEAD - RE: VALVE DIAMETERS. Will you kindly arrange that for all cars following the first 24, we should revert to the following diameters for the inlet and exhaust :- (a). Inlet valve 1.500" diameter. (b). Exhaust valve 1.300" " The object of this reversion is to overcome the slight distortion which takes place on the inlet valve seat, as the result of heat conditions in conjunction with the small section of metal between the two valves. This matter is urgent, and should be given immediate attention. BY.{R.W. Bailey - Chief Engineer} | ||