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).
Experimental cylinder liner materials being tested for resistance to bore wear.
| Identifier | ExFiles\Box 132\5\ scan0055 | |
| Date | 11th March 1939 | |
| -3- The present position regarding cylinder material is as follows. We have produced experimental cylinder liners in the following materials, from which we hope to be able to pick out one material that is superior to the rest for resisting bore wear. The two factors with which we have to contend are corrosive wear and frictional wear. With reference to corrosion, Wing Commander Helmore has a machine for testing sample liners, and one sample from each of our trial materials has been sent to his Laboratory for test. The result of the test should place these samples in their order of merit for resistance to corrosion. The samples are as follows:- Series A.{Mr Adams} Sand Cast. MARK A.100 - 2 1/2% Nickel. A.101 - Standard material. A.102 - Nickel Chrome Alloy. A.103 - Nickel Chrome Molybdenum Alloy. A.104 - Nickel Molybdenum. Series B. Centrifugally Cast. MARK B.106 - Phosphor Chrome. B.107 - High Phosphorous Chrome. B.108 - "Austenitic" Nickel, Copper, Chrome. B.109 - Copper, Chrome, Molybdenum. The difference between Series A and B is that the former are materials which can be cast as a complete sand cast cylinder block. Series B can only be centrifugally cast, and can only therefore be used in liner form. Four cylinder blocks have been cast in Nickel-Chrome-Molybdenum (MARK A.103) and will be fitted to suitable customers' cars by C.W.H. As will be explained later, the only sure way of determining whether a certain step is an improvement for bore wear, is to try it in a customer's hands. We obviously cannot carry this beyond certain limits, so we have only chosen one possible material for trial in this way. | ||