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 lift, noise, and ideas for automatic adjustment mechanisms, including an oil-based temperature regulation system.
| Identifier | ExFiles\Box 178\3\ img166 | |
| Date | 7th September 1924 | |
| (2) I had the impression that Mr.Lovesey got good horse power without high lift. It will be understood that no lift, no noise, and [handwritten: Therefore] higher the lift the greater the noise. Novel. = [handwritten: H.{Arthur M. Hanbury - Head Complaints} E.{Mr Elliott - Chief Engineer} Scheme for Lubrication to keep push rods at same temperature as cylinder jackets.] It has occured to me that we might put an oil pipe the full length of the head, inside so that the oil would be the same temperature as the hottest water. Then bring this oil to fall upon, and run down the push rods, which we understand are quite correct for expansion if kept the same temperature as cylinder jackets. I do not know how difficult it would be to apply auto adjustment, but we have sent several designs and suggestions to Derby, and asked some questions about these which has produced nothing useful. For instance, we schemed the system of making auto adjustment a close fit without oil, in such a way, that there would only be slight extra clearance if it failed, or while it was taking up its clearance. Regarding the pattern (like Cadillac) where the adjustment is on the rocker centre, I could not get anyone to explain how these retrace their adjustment. It may be while the rocker is moving it may carry the eccentric bush with it, (the ~~rocker~~) one always imagines that the retrace should take place while the cam is on the dwell. Will Mr.Elliott try to apply what we have done, i.e. the direct one, and also try an application of the Cadillac scheme. cont'd | ||