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).
Request to issue a Depot Sheet for a weaker release valve spring for the Phantom III to reduce the risk of top over-oiling, including test figures.
| Identifier | ExFiles\Box 131\2\ scan0230 | |
| Date | 8th July 1938 | |
| Typed Text: To By... from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Re: Phantom III. Will you please issue a Depot Sheet for the release valve spring that Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} gave me to try on cars which are converted to solid type rockers. This weaker spring gives less oil pressure to the rocker shaft and considerably reduces the risk of top over-oiling. Swindall can give full particulars etc. Test figures show: Main 32 lbs. Rocker feed 10 lbs. 1000 revs. cold. Main 9 lbs. Rocker feed 3 lbs. warm running slow. Main 26 lbs. Rocker feed 4 lbs. 1000 revs. hot. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} Handwritten Text: Top Center: 1113 Files Left Margin: E3A 10/2 Bottom Section: By/MTN. To By by issuing instructions as above? Spring & supplied GWH{George W. Hancock - Head Chateauroux}, is the present production low pressure relief valve spring (PH III) Rm{William Robotham - Chief Engineer}/SWDL.{Len H. Swindell} | ||