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 different metal alloys for use in cylinder blocks and liners.
| Identifier | ExFiles\Box 132\4\ scan0157 | |
| Date | 9th August 1938 | |
| - 2 - 3. Nickel Chrome Molybdenum Alloy (Mark A103) This is the material which we would recommend to replace our existing cylinder block material and from which we anticipate the best bore wear figures will be obtained consistent with cost and ease of production TC. Si. Mn. S. P. Ni. Cr.{Mr Cra???ster / Mr Chichester} Mo. 3.1 - 3.3% 1.8 - 2.0% .8 - 1.0% .10 max. .25% .8 - 1.0% .35% .35% 4. Nickel - Molybdenum (Mark A104) Undoubtedly the best known material for Cylinder Blocks, the disadvantage being the extra cost over A103, which we believe will yield almost as good results on wear test. Analysis same as A103 but Chromium Nil, Molybdenum .7% 5. Standard Material with Covered Chills (Mark A105) These castings are produced in standard material, by a method incorporating a covered chill which raises the combined carbon in the bore, and therefore the Brinell Hardness without the disadvantages of the face chill as previously used. This practice is used on several well known makers cylinder blocks to our knowledge. Brinell 250-270 Series "B". Centrifugally Cast. 1. Phosphor-Chrome (Mark B106) A centrifugally cast liner with .70 - .80% phosphorus, .30 - .40% Chromium, unheatreated, with no nickel content. 2. High Phosphorus-Chrome (MarkB107) Also centrifugally cast, with phosphorus raised to 1.0%, recently recommended by By to replace Sheepbridge on Phantom 111, should yield much better wear figures than 106, but we would be inclined to expect a rather brittle material for a dry liner, especially where the design incorporates a top shoulder as in Phantom 111. They should however be quite satisfactory for a wet liner. 3. "Austenitic" Nickel Copper Chrome (Mark B108) With 13.0 - 15.0% Nickel, 2.0% Chromium and 6.0% Copper this is the best known corrosion resisting alloy iron, and possesses excellent work hardening qualities. This material is our recommended composition for a centrifugally cast cylinder liner | ||