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).
Specification for the Spectre Unit for 2-S-1 Chassis for France, detailing modifications.
| Identifier | ExFiles\Box 91\3\ scan0056 | |
| Date | 4th July 1935 | |
| To RHC.{R. H. Coverley - Production Engineer} X300a (2) Hs{Lord Ernest Hives - Chair}/Ewdl.5/KW.4.7.35. Specification of SpectreCodename for Phantom III Unit for 2-S-1 Chassis for France. The specification for this unit is to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}21/KW.2.7.35, the cylinder head and 8:1 eccentric ratio tappets as follows :- Cylinder Head LOP. E.85114 (E.86939). E.86874 head for 8 : 1 eccentric ratio tappets to LeC.4427. E.86789 Modified Exhaust Port. E.86440 Modified Water Holes, LeC.4074. LeC.4124 Modification for fitting double Valve Springs. Valves & Fittings. 8 : 1 eccentric ratio tappets, LeC.4427 to LOP.E.86922. Double Valve Springs to Hs.{Lord Ernest Hives - Chair}1827/8. Bottom tappets to the original spec. LOP.E.85337, with the exception that the bottom tappets E.85336 are chrome plated by the "Fescolised" process. The tappets are normally hardened before plating. Tappet springs to E.85314. Camshaft & Bearings. Ex.18044 Camshaft in U.B.A.S. Ex.18899 Stand Pipes to give higher oil level in the camshaft well as shown in the scheme Hs.{Lord Ernest Hives - Chair}1992. The other features of this scheme are deleted. Reverse throttle Carburetters, LeC.4378, and Controls LeC.4495 & LeC.4506. Air Silencer LeC.4536 (felt lined). Oil filter for automatic tappets, LeC.4503. | ||