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).
Modifications to cast iron for chassis cylinders to improve wear resistance.
| Identifier | ExFiles\Box 132\4\ scan0066 | |
| Date | 25th May 1937 | |
| BY.14/G.25.5.37. RE: MODIFICATION TO CAST IRON FOR CHASSIS CYLINDERS. --------------------- Referring to Hl.2/AG.22.5.37. in which you report upon the production of cylinders without chills giving a brinell of 238 as compared with an average of round about 270 using chills, I am satisfied that a drop to this extent in the brinell will undoubtedly re-act upon the life of the cylinder block. After all it is important that we should give the customer the best we know from the point of view of resistance to wear. Some years ago we had the experience of running cylinders round about 200 brinell, it occurred due to the temperature of stress releasing being carried too high, the direct result was that we had complaints of cylinder wear coming into the Works for about a year, with the consequent expressions of dissatisfaction from the customers who were using the cars. Having got back where we have been for some years, that is, with a brinell of round about 260 to 280 I am strongly of the opinion that we should continue to turn out our cylinder castings chilled internally to ensure the increased density of the material, and in addition the reduction in size of the graphite and its much more regular dispersion in small particles throughout the bulk of the material on the wearing face. The cylinders which have been produced can be run in the Experimental Department under general conditions throughout the life of a car, as then we should be able to make more exact comparisons as to the amount we have been debited by the reduction in the brinell. Personally, I am of the opinion it will show very positively in the increased wear and tear. BY.{R.W. Bailey - Chief Engineer} | ||