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).
Report page detailing specifications and performance notes on engine components.
| Identifier | ExFiles\Box 82\5\ scan0153 | |
| Date | 2nd June 1937 guessed | |
| ( 2 ) CRANKCASE & BEARINGS. LOP. EB.2737. Main Bearings produced in A.C.2. CRANKSHAFT. LOP. EB.2700. Extra hole drilled in each crankpin opposite existing. SPRING DRIVE. LOP. EB.129. CONNECTING RODS. LOP. EB.2704. Big ends in Hall's Solid Metal A.C.7. EB.2701 Bolts. OIL FILLER. LOP. E.60872. 25/30 HP. Type Filler with crankcase breather. Handwritten note: Swell - was this an out of date filler? The bearings gave no trouble. The centre plate of the spring drive fractured close to the rivet holes after 4.200 miles. A new plate was fitted. Tests deleting the rocker cover breather to the air silencer in favour of the crankcase breather showed an improvement in oil consumption of 16% with light throttle and 10% with full throttle driving. The rivetted flange for the filler cap came loose in the rivets. This was a usual fault with 30 HP. fillers. PISTONS. LOP. EB.2833. Aerolite Pistons, identification C.14. High compression scraper rings supplied by Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} L. section second rings. CYLINDERS. LOP. EB.2715. EB.2560 Cylinder Head - Deturbulated. EB.2929 Cylinder Block - produced by Midland Cylinder Co. EB. 666 Arrangement of Thermostat. VALVES & FITTINGS. LOP. EB.2708. EB.2793 Inlet Valves S/SLV. EB.2790 Exhaust Valves KE.965 Stellited. 4 - EB. 175 Valve Springs as produced in U.S.A. painted green in Nos. 1 - 4. 4 - EB.3256 Valve Springs in Nos. 5 - 8 painted red and white. 4 - Rd. 260 Valve Springs- produced by Tempered Spring Co. painted red and green in Nos. 9 - 12. Piston knock cold was reported after 8.000 miles | ||