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 modifications when changing from cast iron to aluminium, with a summary of a conference on the subject.
| Identifier | ExFiles\Box 123\5\ scan0310 | |
| Date | 21th February 1939 | |
| 1044 To Rm.{William Robotham - Chief Engineer}.. from Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} c.c. Da.{Bernard Day - Chassis Design} Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner}6/N.21.2.39. Aluminium B.80. We have handed to you drawings: PD.308. PD.313. PD.316. PD.321. These designs shew the modifications necessary when changing from Cast Iron to Alum. Some time back - 25th. November 1938, a conference took place to examine the job from a manufacturing viewpoint. HPS.{Horace Percy Smith - Experimental Factory Mgr} comments and suggestions were as follows:- (1) The narrow pieces of sand between the barrels and between the valve chest were thought to be too small but since Brailsford of the Alum. Foundry said it could be done, it was decided to let him try. (2) The long drillings for the oil gallery and bearings feeds can be made free from porosity trouble with our modern technique. (3) It was agreed to try the American method of fixing the exhaust valve inserts, this has a free band at the top which is sunk below the mouth. Refer to memo E3/HP.27.4.37. (4) There was some doubt about the exhaust valve guides remaining tight if made with a parallel fit, in view of this half the engine should have taper guides and the other half parallel. (5) Duralumin bearing caps were agreed to. (6) The inserts for set screws should be the square collar type. Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} | ||