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).
Use of a larger diameter duralumin valve push rod for the lighter Phantom engine.
| Identifier | ExFiles\Box 65\4\ scan0334 | |
| Date | 23th April 1926 | |
| To R.{Sir Henry Royce} from E: Copy to BJ. " HS.{Lord Ernest Hives - Chair} " BY.{R.W. Bailey - Chief Engineer} X8050 E1/M23.4.26. LIGHTER PHANTOM VALVE TAPPET HOLES -X.8060. We have sent a drawing to Derby -LeC 2236, to which we attach a blue print herewith, shewing a valve push rod of larger diameter for the lighter Phantom engine. As mentioned in a previous memo, we wish to use duralumin for this part to maintain correct clearance. LeC.2236. shews a rod two and a half times as strong as the duralumin rod of standard dimensions which failed. To accomodate the larger diameter we have used parallel guides tubes through the cylinder head instead of waisted ones, and asked the Works to scrape the casting away with a piloted tool where it impedes the passage of the tube. The gas passages between the guide tubes remains unaltered and the diameter of these tubes where socketed into the cylinder is no larger than formerly. E.{Mr Elliott - Chief Engineer} | ||