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).
Blueprint detailing manufacturing specifications for piston ring grooves and skirt.
| Identifier | ExFiles\Box 173\3\ img022 | |
| Date | 2nd June 1940 guessed | |
| SIDES OF RING GROOVES MUST BE SMOOTH, FLAT, & RUN TRUE WITH SKIRT O.D. - THE BOTTOM OF GROOVES MUST BE SQUARE WITH THE SIDES .1255 / .1265 .125 / .126 .1875 / .1885 12/32 3/16 7/64 34/32 C 3/32 GRIND CHAMFER 1/16 SAW - 2 SLOTS BEFORE FINISH GRINDING BREAK CORNER 3.299 CAM 3.237 GRIND BREAK CORNER 1/64 MAX. R.{Sir Henry Royce} | ||