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).
Standardisation of parts relating to tin-coated pistons to prevent piston scuffing.
| Identifier | ExFiles\Box 171\5\ img050 | |
| Date | 26th May 1938 | |
| RR 755B (10H) (49968) 19/10/37 C.E.Co. COMPLETED 22.9.38. BENTLEY STANDARDISATION OF PARTS Date Issued: 26.5.38. Sheet No.: B.15. Drg. No.: EB.3151. L.O.P.S. EB.2833 Description: Tin-coated pistons. Purpose: To prevent piston scuffing. Brief Report and Remarks: Recent experiments show that by tin-coating the piston, scuffing of the skirt is avoided. This process will enable us to use any type of oil with safety and will help in reducing the time necessary to "run in" engines on test. Have completed 40 hours endurance running with satisfactory results. When recommended for Introduction: Report References: Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews}1/MH.{M. Huckerby}5.4.38. By: Rm{William Robotham - Chief Engineer}, Da{Bernard Day - Chassis Design}, Mx{John H Maddocks - Chief Proving Officer} By: RM.{William Robotham - Chief Engineer}, DA.{Bernard Day - Chassis Design}, MX.{John H Maddocks - Chief Proving Officer} Old Parts: Material £3.1.6., Labour Bought Outside, Total £3.1.6. New Parts: Material £3.3.0., Total £3.3.0. Increase in Cost £ 0. 1. 6. GTH{G. T. Houlistan} 24/6/38 Production Position and Comments: Cost of Tools £ Nil. Tin coating of pistons to reduce possibility of "scuffing" during "running in" process was introduced on 24th. chassis in "M" series existing stocks of Aerolite pistons being returned to makers for tin coating operation. No tool cost is involved, but makers charge for tin coating is 3d. per piston or 1/6d. per chassis, and future pistons will be supplied already coated. It is not recommended however, that present "running in" times for Production engines be reduced on account of impairing reliability. Authorisation to Proceed. Introduce on the 24 Chassis in M Series. Sg.{Arthur F. Sidgreaves - MD} Signature Date 20/9/38 RHC{R. H. Coverley - Production Engineer} Hs.{Lord Ernest Hives - Chair} Signature Date 20/9/38 | ||