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).
Numbered list of engine component specifications and updates, page 2.
| Identifier | WestWitteringFiles\R\October1927-December1927\ Scan096 | |
| Date | 22th November 1927 guessed | |
| (2) (21) Piston pins of valve spring steel tempered about 400 Brinell, Secured by spring wires. (22) Valve springs of latest type LeC. 2440. (23) Camshaft with longer duration inlet cam to a degree which does not spoil low speed torque. (24) Carburetter with larger throttle valve and venturi passage to suit through cyl. block. (25) Magnesium valve gear cover. (26) Aluminium cyl. covers and cyl. head covers. (27) Distribution moulding and rotor in non in non-tracking material (stabalite.) (28) Sleeveless magneto. (29) Oil relief valve of reed type. (30) Distance reading petrol gauge. (31) New type slipper flywheel. R.{Sir Henry Royce} | ||