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).
Specifications for cylinder inserts and pistons for various car models.
| Identifier | ExFiles\Box 132\5\ scan0045 | |
| Date | 21th February 1939 | |
| -2- Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}3/R.21.2.39. W.X.A.1 (Sg{Arthur F. Sidgreaves - MD}'s Car) Short cylinder inserts to be fitted as follows:- Cyl. Nos. 1 & 2. Standard bores (no insert) " " 3 & 4 MARK A.101 (Std. material but in short liner form.) " " 5 & 6 MARK A.105 (Ditto. with covered chills) Pistons: EW.2121. (Raised crown split skirt.) W.X.A.2 (Hs{Lord Ernest Hives - Chair}' Car). Conditions exactly as Sg{Arthur F. Sidgreaves - MD}'s car except that pistons to have raised crowns. Pistons: EB.4587. (P.452.) B.50.LS. (Lp{Mr Lappin}'s car). .25% Chrome block (existing). Pistons. Nos. 1, 3 & 5. EB.3916. " 2, 4 & 6. EB.2844. 27.G.VI. (W.III No.6 Unit) (Mx{John H Maddocks - Chief Proving Officer}'s car). Short cylinder inserts to be fitted as follows:- Cyl. Nos. 1 & 2. Standard bores (No insert) " " 3 & 4 MARK A.103 (Ni.Ch.Mo. as sent to GWH{George W. Hancock - Head Chateauroux} in block form.) " " 5 & 6 Hichrome (Brico). Pistons. Nos. 1, 3 & 5 EW.2121. " 2, 4 & 6 EB.4587 (P.452) | ||