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).
List of modifications and specifications for engine units 13 (32-EX) and 14.
| Identifier | ExFiles\Box 155\2\ scan0143 | |
| Date | 6th September 1937 | |
| 5. Unit No. 13. (32-EX) Std. production crankcase. Rubber under top flange of cylinder liners. Modified tappet block clamp Lec.5371. Std. W/M main and big end bearings. Rods with modified panel milling Lec.5330. Strengthened emulsion oil filter Lec.5665. 4 port cylinder heads suitable for solid rocker gear Lec.5441. Modifications to lubrication of valve gear Lec.5444, Rm. {William Robotham - Chief Engineer} 380/1/2 and to relief valve Lec.5448. E.88447 strengthened exhaust valves KE.965. E.88782 solid stem inlet valves S/SLV. S side valve springs EB.175. Improved cored Alum. hot spot Lec.5461. Strengthened throttle spring Lec.5335. Camshaft E.88760 to suit solid rockers. Special direct petrol pipe E.89050. General bye-pass from filter from rocker press to oil filler. Cork level indicator with steel arm Lec.5506. Long type clutch centre with wide facings. Linings in Thermoid. Unit No. 14. Unit being prepared for 15,000 miles in 39-EX. Modified crankcase to suit 1 1/2 engine speed water pump and dynamo. 25/30 Dynamo. Packard type crank E.88364 ex No. 12 unit. W/M main bearings. Strengthened connecting rods Lec.5687. Forked rod bushes in Hall's metal .093, 3 in AC.6 and 3 in AC.2. Strengthened bearing halves, std. W/M outer dice for blade rod bearings. Rm. {William Robotham - Chief Engineer} 160 cylinder heads 6.5 : 1 C.R. adapted to suit solid rocker gear. Solid stems inlet valves E.88782 S/SLV. Strengthened Ex. Valves E.88447. KE.965. A. {Mr Adams} 1 - 6 valve springs Rs. {Sir Henry Royce's Secretary} 540 marked red. 7 -12 valve springs Rs. {Sir Henry Royce's Secretary} 540 marked blue. B. 1 - 6 valve springs EB.3256 marked red. 7 -12 valve springs EB.3256 marked blue. Rocker gear to Lec.5441 and lubrication Lec.5444 with modifications Rm {William Robotham - Chief Engineer} /380/1/2. Modified bottom tappets without springs Lec.5667 (these if possible). Cylinder liners A.1, 2, and 3. Std. Sheepbridge. A.4, 5, and 6. R.R.Cast Iron. B.1, 2, and 3. Hepworth & Grandage. B.4, 5, and 6. Brico. Continued | ||