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).
Design improvements for a Phantom Aluminium Head induction pipe bolting.
| Identifier | WestWitteringFiles\O\January1926-March1926\ Scan120 | |
| Date | 10th March 1926 | |
| TO E.{Mr Elliott - Chief Engineer} & DY.{F R Danby} FROM R.{Sir Henry Royce} C. to Col. BL. HS.{Lord Ernest Hives - Chair} CKT. RG.{Mr Rowledge} ORIGINAL [Handwritten] 4/3/26 R1/M10.3.26. PHANTOM ALUMINIUM HEAD. [Handwritten] X8070 X8050 Your design shewn on print of Lec.2204. seems very good indeed, but might be simplified in the bolting of the induction pipe - [Diagram with labels: Centre line. 1 long boss & 3 moderate ones.] (1) Why not use the simple 2 bolter where it can be used: the exhaust washer can be used. (2) Place the upper stud so that it encroaches slightly on the bore of the pipe at the top, then put another one opposite. This should clear the plug: if not sufficiently then incline the plug slightly nearer its neighbour. Perhaps same gasket throughout, shorter if wise, 4 studs saved. Apparently these schemes (yours and mine) require exhaust manifold on first, then induction pipe, but mine has less studs, and all accessible to box key. Would it be good to use deep nuts one size smaller, with collar or without studs. They might be nearer in as box key would be smaller. If the arrangement of plugs suggested at Le CanadelHenry Royce's French residence is not adopted we should go back to the simple dog fixing, but if an improvement as regards power at low and high speeds, permitting higher compression, arrange for this at same time. It will be worth the trouble because of less weight, more power, greater fuel economy, should all follow. R.{Sir Henry Royce} | ||