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).
Instruction to permanently modify the pattern for a Sports Phantom cylinder head to alter the compression ratio.
| Identifier | ExFiles\Box 65\4\ scan0383 | |
| Date | 29th December 1927 | |
| Y8050 C. Hs.{Lord Ernest Hives - Chair} BY/SS{S. Smith}5/K.{Mr Kilner} 29. 12. 27. SPORTS PHANTOM CYLINDER HEAD --------------------------- Will you please instruct the Pattern Shop to permanently modify the pattern for cylinder head E.76656 (5 to 1 compression) so that we may produce castings which will also machine to give(4 1/2 to 1 compression). This modification will be on the lines already adopted for pattern E.76846 (4 1/2 to 1 compression) which also produces E.76847 (4 1/2 to 1 compression). Kindly instruct Pattern Shop at once and then follow up with a drawing to the Experimental Shop showing the(4 1/2 to 1 compression.) BY/SS.{S. Smith} | ||