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).
Comparison of material costs for pistons, valves, crankshafts, and crown wheels.
| Identifier | ExFiles\Box 127\3\ scan0186 | |
| Date | 5th August 1937 | |
| COPY. ----- 5th. August 1937. Hereunder comparisons between our material costs, and the alternative figures you asked me to investigate:- PISTONS: Casting 59108: Alternative: In Bohnelite ... 2/2d. Material ... 2/2d. Weight 14 oz. = 2/5¼d.{John DeLooze - Company Secretary} per lb. Weight 1-lb.3½-oz. 1/9¾d.{John DeLooze - Company Secretary} per lb. Note: The summary shows this article as made in manufacturers' own Foundry and gives no separate price for Foundry wages, which is apparently merged into the total wages figure for machining the pistons; hence comparison is difficult. VALVE: Valve Forging. Alternative: In KE.241 ... 10d. In Silchrome ... 8½d.{John DeLooze - Company Secretary} Weight 3½ oz. = 2.19d. per oz. Weight 2½ oz. = 3.67d. per oz. CRANKSHAFTS: 16 h.p. Crank: Alternative: M.4035. In Nickel Chrome Molybdenum £2.15.0. each. In Chrome Molybdenum. £5. 5.0. each. Weight 81 lbs. = 8¼d.{John DeLooze - Company Secretary} lb. Weight 127 lbs. = 9.92d. per lb. CROWN WHEELS: Crown Wheel Stamping: Alternative: In 5% Nickel Case Hardening Steel. 5/6d. In nickel case hardening steel, percentage not stated. Weight 13 lbs. = 5.08d. lb. Mtl: 10/10½d.{John DeLooze - Company Secretary} Stamping shop wages: 10d. | ||