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).
Increasing the running time limit for aluminium pistons before replacement.
| Identifier | WestWitteringFiles\B\March1918\ Scan1 | |
| Date | 12th March 1918 | |
| COPY. ORIGINAL To BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} Copy to CJ. " " EH. " " EP.{G. Eric Platford - Chief Quality Engineer} 12th March, 1918. 4 R8/G12318. D RECEIVED BY16/P7318. X. 2638 X. 3000 RE TIME LIMIT OF ALUMINIUM PISTONS I was not sure whether we were acting on the earlier suggestion of scrapping the pistons after running a fixed length of time. It is quite good to keep a very severe watch on these pistons, and Mr. Hall should be made the head quarters of information as to whether there is any deterioration in the metal likely to cause a broken piston. If nothing can be found at the end of 250 hours running time, I should feel inclined to advise an increase in the number of hours, to say, 400. The point of difficulty appears to be as to whether the pistons are changed in the field or when returned for an overhaul. If this alteration is only made when the engines come to the Works, then it would appear that unless we changed them at 250 hours they might not get changed until perhaps 500 hours. This matter ought to be settled by a long run on the test bench, and I am proposing that the new engines which we are making, shall have a 300 hour run to ascertain such matters. R.{Sir Henry Royce} I suggest if we are all in agreement that 400 hours be adopted if the pistons are changed in the field, if after overhaul then 300, so that they could not be run much over 400 hours anyway. | ||