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).
Table comparing engine component mileage and oil consumption related to connecting rod oil jet holes.
| Identifier | ExFiles\Box 144\3\ scan0327 | |
| Date | 3rd December 1940 guessed | |
| 1220 THESE ENGINES HAVE .031 OIL JET HOLES IN CONN.RODS CHASSIS | Oil Consumption M.P.G. | Cyl. Block Mileage | Conn. Rod Mileage | Piston Mileage. | Notes --- 8.B.V. | 1106.4 | 2031 | EW.1764 Wraith Drilled. 2031 | 19755 | Pistons in cyl. Nos. 1 and 3 changed. 9.B.V. | 606.4 728 656.8 | 16364 | 4708 | 4708 | 12.F | 2313 | 34914 | 36539 | 34914 | 2.B.50 | 2211.2 | 26594 | 26594 | 26594 | 4.B.50 | 1792 | 19541 | 19541 | 19541 | OIL JET HOLES BLANKED OFF 6.B.50 | 1700 1148 2689.6 | 20308 | 20308 | 20308 | For the last oil cons. check we were dependent on the transport figures for oil used. WRAITH RODS EW.1749/50 NOT DRILLED 10.G.VII | n/61.6 | 71474 | 19040 | 71474 | 1.B.50 | 1209.12 | SHORT INSERTS 7286 | .010 OVERSIZE 7286 | 7286 | Conn rods are Experimental production only Ex.36632/3. | ||