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).
Alteration note changing the piston ring specification from 212A to 4K6 for various models.
| Identifier | ExFiles\Box 148\1\ scan0251 | |
| Date | 8th April 1940 | |
| 130/RE 1256 . 8.4.40. L.H. SIL. PHANTOM. TECT BGO BI. PISTON 5040. E34738 PISTON RING E24737 " " ALTERATION: SPEC'N ALT'D FROM 212A TO 4K6. REASON: 4K6 IS MAKERS SPEC'N. RIPPLET. B80 ALUM. WR.III. PISTON SEC 5040. EW 2172. PISTON RING. EW 2173. " " ALTERATION: SPEC'N ALT'D FROM 212A TO 4K6 REASON: 4K6 IS MAKERS SPEC'N. 10/6 H.Read | ||