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).
The condition of various engine heads after testing, detailing warped and good condition units.
| Identifier | ExFiles\Box 158\4\ scan0232 | |
| Date | 26th May 1938 | |
| 1360 Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}7/MH.{M. Huckerby}26.5.38. Of available heads not fitted to engines following heads have warped. EW.1296 B.III No.1 Test bed engine (.250 section) 200 hrs. EB.2925 B.4 Test bed engine (.250 section) EW.1296 W.III No.7 (10,000 miles test) (.250 section) EB.2925 - Test bed engines (.250 section) Following heads are in good condition. Ex.29685 (Small valve head) test bed (.350 section) 10 hrs. 15 mins. E.61081 W.III No.4 (27.0.VI) (.437 section) 6,000 miles. EB.3121 B.4 Test bed engine. (only run short time) Also a customer's 3½ litre Bentley head was inspected. This was O.K. but had only done 1,000 miles since last grind in. (.350 section). Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Rm.{William Robotham - Chief Engineer} Above information of heads taken at random as available. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||