Listing required engine components and discussing cylinder head modifications and compression ratios.
| Identifier | ExFiles\Box 98\5\ scan0086 | |
| Date | 17th August 1939 | |
| -2- By {R.W. Bailey - Chief Engineer} /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/MH. {M. Huckerby} 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. Ald {F. Allwood - Experimental Design} By {R.W. Bailey - Chief Engineer} /Ald. {F. Allwood - Experimental Design} | ||
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).