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).
Replacing case-hardened piston pins and confirming the increased stiffness of the latest 20 HP crankshaft.
| Identifier | ExFiles\Box 65\4\ scan0206 | |
| Date | 21th November 1927 | |
| 48010 Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} R2/M21.11.27. X.3996 X.5010 X.8010 IT IS OF UTMOST IMPORTANCE TO REPLACE ALL CASE-HARDENED PISTON PINS WITH THOSE MADE FROM VALVE SPRING STEEL HARDENED AND TEMPERED TO ABOUT 400 BRINELL. ENDURANCE TEST THESE AT ONCE PREFERABLY IN THINNER SECTIONS THAN INTENDED FOR USE, CANCELLING CONN. ROD LUBRICATING PIPES AT THE SAME TIME. X.5010 X.8010 IT IS VERY URGENT TO CONFIRM ANTICIPATED INCREASED STIFFNESS OF LATEST 20 HP. CRANKSHAFT BECAUSE THIS HAS PROPORTIONATELY SMALLER PINS AND OVAL WEBS THEREFORE SUGGESTING EXTREME DESIRABILITY OF SPORTS PHANTOM ALSO HAVING OVAL WEBS BUT WITH THE LARGER PINS. R.{Sir Henry Royce} | ||