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 parts and modifications required for a cylinder head, including details on compression ratios.
| Identifier | ExFiles\Box 90a\1\ Scan015 | |
| Date | 17th August 1939 | |
| -2- By/Ald.{F. Allwood - Experimental Design}1/AW.17.8.39. Section 5050. KB.432. Stud - Cylinder to Head. - - 1 off. KB.825. Stud - Cylinder to Head. - - 4 " The following prints will not be required:- Section 5000. EB.630. Cylinder Head Stud. - - - 4 off. EW.1539. Cylinder Head Stud. - - - 14 " EW.1540. Cylinder Head Stud. - - - 8 " Section 5050. EW.1221. Cylinder Head Stud. - - - 1 " KB.829. Cylinder Head Stud. - - - 4 " EB.5125 Cylinder Head. - - - 1 " EB.3238. Valve Guide. - - - 12 " EB.4069. Water Jacket Tube. - - - 12 " Section 5060. EW.1852. Inlet Valve. - - - - 6 " EB.4516. Push Rod. - - - - 12 " Kindly instruct 1 set. The above is as requested by memo Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}2/MR.22.7.39. With the Cylinder Head EXS.1900, a compression Ratio of 10:1 is given when using the bump crown Piston EB.4587, while with the flat-topped Piston EW.2115 the ratio is 8.35:1. Attached to Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}'s copy is a blue print of SCD.1470. With reference to the Cylinder Head EXS.1900, this will entail a small modification to the existing pattern. Acl By/Ald.{F. Allwood - Experimental Design} | ||