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).
Technical report on Opel cylinder heads and a visit to Elektronmetall to observe piston technology.
| Identifier | ExFiles\Box 148\3\ scan0237 | |
| Date | 21th June 1937 | |
| -3- S/PSN.1/M.21.6.37. OPEL. (Cont'd). The cylinder head was interesting in that it had four inlet ports similar in arrangement to our own four-port head, and a simple combustion chamber with a sloping wall opposite the plug as shown in sketch. The studs on the port side came out below the port level so that the ports were particularly short and the head very compact. A sketch of the rear main bearing oil seal is attached. If it is effective it is certainly a cheap way of doing the job. Elektronmetall, G.M.B.H. As far as we could gather, this Company supplies about 90% of Germany's piston requirements, besides filters, aircraft wheels and undercarriages in Electron, and pressure die castings in Electron and other light alloys. Electron was at first tried for pistons, but its strength and bearing properties are poor at high temperatures, and pistons are now mostly being made in high silicon alloys and to a lesser extent in the copper alloys similar to R.R.59 and Y. alloy. The scope of our visit was confined to piston work. Points of interest were:- (1) Pistons with 1st or 1st and 2nd ring grooves in C.I. inserts cast in position. These seem to find favour in oil engines mostly, where the rate of ring groove wear is high. (2) We saw some heavy oil engine and aero pistons with the internal form finish forged hydraulically. No machining is done inside the piston and the finish is very good. (3) Design of oil drillings for aero piston gudgeon pin boss. (See sketch). (Cont'd) | ||