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).
Instructions to correct a mistake regarding the detailing of the Alum 80 engine, with new guidance on crankcase patterns and cylinder heads.
| Identifier | ExFiles\Box 124\1\ scan0140 | |
| Date | 6th June 1939 | |
| 10HH To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c.c. DA.{Bernard Day - Chassis Design} c.c. HFS. c.c. Sft{Mr Swift}/hw. c.c. By/HS.{Lord Ernest Hives - Chair} c.c. By/CS. c.c. DA{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} c. HFS/LH.{Mr Haworth} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/NH.6.6.39. ALUM 80 ENGINE. By a mistake in our original instructions Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} 5/MH.{M. Huckerby}4.5.39, this unit has been detailed in accordance with the memo By/CS.1/EH.22.5.39 to suit the Conventional type of cylinder head instead of the High Power head. The instructions given, therefore, should be cancelled and re-issued to conform to the following:- (1) As before the bottom part crankcase pattern of the "Conventional" which is a separate pattern piece to take either type of head, should be used. (2) The top part crankcase pattern to suit the high power head and modified to incorporate the dry liners (.25 bore). From the combination of (1) and (2) alum casting to be taken. (3) Before using the bottom part pattern of the "Conventional" crankcase and the top part (High Power) combination, the details should be checked over to see that there are no snags. (4) In using an alum top for the High Power head it will be necessary to use screwed-in exhaust valve seats as against the present press-in seats in iron. The screwed-in seats should be in S/SLV, have the full form thread and the latest recommended clear- ande per inch diameter as Ph.111. | ||