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).
Technical table detailing specifications and applications for various pistons.
| Identifier | ExFiles\Box 124\2\ scan0211 | |
| Date | 10th October 1939 guessed | |
| P I S T O N S Piece No. R.R., Makers., Bore., Weight., Skirt Dimensions. Bedding. Relieved., Top Land Dimensions., Gudgeon Pin Centre to Piston Top., Height of raised crown., Volume of raised crown., Material Spec'n. No., R E M A R K S. EB.2844, Aerolite., 3.5", 19 ozs., AA{D. Abbot-Anderson} 3.497" BB 3.4975", 3.482" x .25", 2.270", , , A/P 404, 200 in G series) 200 in H series) 100 in K series) No.12 cam BII grinding. EB.3916, ditto, 3.5", 19 ozs., AA{D. Abbot-Anderson} 3.4955 BB 3.500", 3.482", 2.270", , , A/P 404, 101 onwards in K series - BII also used on B.V. and B.60. EW.2115, R.R.design "Aerolite" Split skirt., 3.5", 20 ozs., AA{D. Abbot-Anderson} 3.497" BB 3.500" AA{D. Abbot-Anderson} 3.485" BB 3.495", 3. x .20", 2.240" (EW1967-2.270"*), (.030" Kingerite gasket) (.060" o/A gasket), , A/P 404, E.61463 A&B series) EW.1967 C series) Wraith EW.2115 D "onwards) (& EW.2115) (the same (except *) "Mod HB{C. E. Harcombe} sawcut", R.R. design "Aerolite" Split skirt., 3.5", , AA{D. Abbot-Anderson} 3.497 BB 3.500 AA{D. Abbot-Anderson} 3.485" BB 3.495", x.20, 2.240", , , A/P 404, Same as EW.2115 but with additional sawcut in bottom piston ring groove on thrust side to relieve skirt expansion at the top. EB.4587 *(P452A), "Aerolite", 3.5", , AA{D. Abbot-Anderson} 3.4970" BB 3.4975", 3.482"x.220", 2.240", .2", 1.083cu"A 17.7cu.cms., A/P 404, Fitted to Prod B.V. No.14 cam grinding. * EB.4587 Drawing shows skirt clearances given on P452. Needs altering. EW.2121 (P.461), R.R.design split skirt "Aerolite", 3.5", 21.1 oz., AA{D. Abbot-Anderson} 3.4970 BB 3.500 AA{D. Abbot-Anderson} 3.485 BB 3.495, 3.482"x.20", 2.240", .2", 1.083 cu"A 17.7cu.cms., A/P 404, Interchangable with EB.4587 No.16 cam grinding. EB.4740 (P451A), "Aerolite", 3.5", , AA.{D. Abbot-Anderson} 3.497" BB 3.4975", 3.482"x.220", 2.240", .33", 1.782cu"A 29.1cu.cms, A/P 404, Fitted to Prod. "Corniche" No.14 cam grinding. EW.2170 *P.466/5, Split Skirt. "Aerolite", 3.25", 19 ozs., AA{D. Abbot-Anderson} 3.2470 BB 3.250" AA{D. Abbot-Anderson} 3.235 BB 3.245", 3.233"x.2", 2.240", .36", 1.75 cu"A 28.6 cu.cms., A/P 404, Fitted to "Ripple". * P.465-EW.2170 shows .470 RC.{R. Childs} This was altered to .36 RC.{R. Childs} without issuing another drawing. P.466 is "Aerolite" drawing for .36 | ||