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).
Limits of reducing the exhaust valve size without a loss of power, referencing curve Hs.1214.
| Identifier | ExFiles\Box 17\6\ Scan213 | |
| Date | 19th May 1934 | |
| X7060 To E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}7/KW.19.5.34. With reference to our conversation re lightening the Exhaust Valve, we have now got out our figures on the attached curve Hs.{Lord Ernest Hives - Chair}1214, from which it will be seen that we cannot reduce the Exhaust Valve size by more than .025" without losing power. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||