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).
Instructions for modifying a chassis unit, including fitting special bearings and adjusting the compression ratio.
| Identifier | ExFiles\Box 89\4\ scan0120 | |
| Date | 7th July 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}5/AP.7.7.37 261 B.57.KW. (Vandervell) With reference to the unit for the above chassis in which you are to fit special bearings etc. in accordance with Rm.{William Robotham - Chief Engineer}5/R.5.7.37, the following are the details of the complete job as required. (1) Drill an opposite hole to existing, .125 dia, in each crankpin. (2) Fit die cast main bearings in A.C.6. Check brinell figure. (3) Fit big end bearings in A.C.6. but with single centre hole oil feed up the connecting rod Ex.27892. (4) Both main and big ends to have RR.56. shims. (5) Machine .075 off the cylinder head face which in conjunction with our supplying a 'Corrujoint' gasket will make the compression ratio 8.9:1. Parts for the job including crankcase, crankshaft, connecting rods and cylinder heads are being supplied by RHC{R. H. Coverley - Production Engineer}/SCT. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||