List of features to be incorporated in the design of self-adjusting tappets for the Spectre engine.
| Identifier | ExFiles\Box 96\2\ scan0004 | |
| Date | 29th May 1934 | |
| x4044 357 E. {Mr Elliott - Chief Engineer} From Hs {Lord Ernest Hives - Chair} /Std. Hs {Lord Ernest Hives - Chair} /Std.2/MA.29.5.34. We send you herewith a list of features which should be incorporated in the design of self-adjusting tappets for the Spectre(Codename for Phantom III) engine. (1) Oil supply scheme - this should be similar to that detailed for the Phantom on LeC.3876. (2) Plungers - as detailed for latest J.III and Phantom tappets but having the ball valve seatings spherical instead of sharp edged - ball valve movement to be .006" plus 3. (3) Rocker shaft - as detailed for J.III and latest Phantom & Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine), but made of S/ZN, hardened and ground. (4) Spacing distance pieces - these should be in the form of springs as used in Cadillac design (similar) to Hs. {Lord Ernest Hives - Chair} 1360). (5) Eccentrics - white metal lined as on Phantom & J.III, but having .001" diametral clearance on rocker shaft. (6) Oil filter and non-return valve. - this should be fitted in the oil feed to rockers and the filter should not have a bypass. We wish to have these features on Spectre(Codename for Phantom III) automatic tappets as the LeC. present scheme for them is out of date. Hs {Lord Ernest Hives - Chair} /Std. | ||
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).