Requesting a modification to by-pass the main oil pressure relief valve on Vulture & 28-EX engines.
| Identifier | ExFiles\Box 123\3\ scan0128 | |
| Date | 7th February 1934 | |
| To RHC. {R. H. Coverley - Production Engineer} x4704 Hs {Lord Ernest Hives - Chair} /Std.4/KW.7.2.34. Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine) & 28-EX Automatic Tappets. ---------------------------------- We wish to ensure a supply of oil to the rocker shaft at low speeds, and high oil temperatures, by by-passing the main oil pressure relief valve. Will you therefore please have a slot (.0625" wide and .040" deep) machined in the seating of this relief valve in order to by-pass it, on both the Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine) and 28-EX engines. Hs {Lord Ernest Hives - Chair} /C.S. Steadman. | ||
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).