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 sheet for Wraith III engine units No. 1, No. 2, and No. 3 (Test Bed).
| Identifier | ExFiles\Box 155\2\ scan0117 | |
| Date | 13th July 1937 | |
| -4- Wraith III.No.1. Unit (26.G.V1) W/Mt. main bearings RR.56. liners. Crankshaft with 2 - .125 holes in pins. A.C.C. big ends single hole feed in bush (top half) Ex.28171. Unhardened engine gears in S/ZNX. Bottom tappets in I/C (R.R.) Chevrolet type Ex.27960. with push rods to suit. Tappet guides tilted by boring 45'. Annulus in front and rear bush of spring drive to improve lubrication of 'cotton ducks'. RR.965 stell. exh. valves 1.4 dia. S.65 inlet valves 1.6 dia. Nos. 1 - 6 valve springs S/CV. (RS.{Sir Henry Royce's Secretary}540) Blue. Nos. 7 -12 " " (Swedish wire) (Red and Blue increased heat treat) RR.Coiled. Rs.{Sir Henry Royce's Secretary}540. Rm.{William Robotham - Chief Engineer}400 top spring washers. Relief valve springs E.88790 main Ex.28174 rocker. Lower rated spring drive friction springs. Ex.28234 springs. Rm.{William Robotham - Chief Engineer}402 caps. Set at 15 - 17 lbs. at 17 1/2" rad. Lucas suction ignition control. Wraith III. No.2. Unit (24.G.V1) W/Mt. main brgs. RR.56. shims. A.C.C. big end bearings. Unhardened engine gears in S/ZNX. Cylinder head obsolete type without fan mounting. S/SLV. inlet valves and RR.965 (stell.) exh. valves. Rm.{William Robotham - Chief Engineer}260 Valve springs. Bottom tappets in I/C (RR.) Chev. type Ex.27960 with push rods to suit. Tappets square and not tilted. wraith III. No.3. Unit (Test Bed) W/Mt. main brgs. RR.56 shims. A.C.C. big end bearings. S/SLV. inlet valves RR.965 (Stell.) exhaust valves. Camshaft with extended toes RS.{Sir Henry Royce's Secretary}607. Bottom tappets in I/C (RR.) Chev type Ex.27960 with push rods to suit. Tappet guides tilted by boring 45'. RS.{Sir Henry Royce's Secretary}540 springs in Swedish wire coiled by RR. Rm.{William Robotham - Chief Engineer}400 top washers. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||