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).
Issues with Bentley piston rings, comparing heat stressed vs. hammered stressed types.
| Identifier | ExFiles\Box 103\2\ scan0113 | |
| Date | 11th March 1937 | |
| LNH. Hs.{Lord Ernest Hives - Chair} from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} E.{Mr Elliott - Chief Engineer} By Rm.{William Robotham - Chief Engineer} Kingsbury. Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}1/R.11.3.37. BENTLEY - PISTON RINGS. The Kingsbury Department has recently been receiving piston rings that are apparently heat stressed in place of the hammered stressed. They have been a failure with regard to oil consumption, and have necessitated the stripping down of the engine to fit other rings. A recent case was 400 M.P.G. with the heat stressed rings and 800 hammer stressed standard brico. The Depot has to-day received another supply of rings which are hammer stressed. Why are these different rings being supplied. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} | ||