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).
The Japan 3 cylinder head, discussing starting torque and compression ratio.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan226 | |
| Date | 20th January 1931 | |
| BY.{R.W. Bailey - Chief Engineer} FROM E.{Mr Elliott - Chief Engineer} C. to SG.{Arthur F. Sidgreaves - MD} WCR. HS.{Lord Ernest Hives - Chair} JAPAN 3. - CYLINDER HEAD AND STARTING TORQUE. In reply to your recent memo. concerning the starting torque please note we will look into the question of what modification is required. Regarding the question of compression ratio the Japan 3. cyl. head should be produced with 5.25 to 1 by suitably adding to the thickness of the floor of the water jacket. The design has been made with 5.5 to 1 so that this latter ratio can be obtained if desired. E.{Mr Elliott - Chief Engineer} [Handwritten over 'CYLINDER HEAD']: ORIGINAL [Handwritten below reference number]: xse50. [Stamp]: RECEIVED 21 JAN 1931 | ||