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).
Engine cylinder liner wear, comparing performance before and after fitting a dry liner in Leyland engines.
| Identifier | ExFiles\Box 140\3\ scan0245 | |
| Date | 3rd May 1939 | |
| -2- Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}5/JH.3.5.39. by the one operation the liner is left flush with the top of the block and no further machining on the block face is necessary. Two years ago Leylands were in considerable trouble with excessive wear, and since fitting the dry liner (two years ago) there has been no further complaints. Leylands have very little record however to show the improvement, and we had considerable trouble in hunting up sufficient information from the various departments. The only available information was from their oil engines, and before quoting these figures, it should be remembered that the relative bore wear between an oil and a petrol engine is in the ratio of four to one in favour of the oil engine. The following figures therefore represent a fair average from twenty engines in service, at mileages about the same as those supplied by our Depots of our own cars. (a) Prior to the liner : wear = .001/4950 miles. (b) After fitting liner: wear = .001/6000 miles. This represents an improvement in mileage per thou. wear of 18.3%. There is no doubt that the improvement is very much greater on the petrol engine because the percentage just quoted would not be sufficient in itself to get them so completely out of their difficulty. The material of their liner is Phosphor Chrome, the same as we are testing experimentally at the present time. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||