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).
Testing of a 5 1/2 to 1 compression ratio cylinder head on the 19-EX Phantom II.
| Identifier | ExFiles\Box 14\3\ Scan081 | |
| Date | 6th August 1932 | |
| x7050 To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/ADL6.8.32. PHANTOM II CYLINDER HEADS 19-EX has returned from France after running 10,000 miles on straight petrol and cannot be said to detonate excessively. In view of this fact and also that Ethyl petrol can now be obtained everywhere, we want to try out the a 5 1/2 to 1 compression ratio head. Will you therefore please instruct such a head as we know that 19-EX performance is still considerably short of the expectations of Sales. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||