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).
Conclusion on tests to cure an oil leak, detailing modifications, further experiments and the deletion of felts.
| Identifier | ExFiles\Box 115\3\ scan0060 | |
| Date | 6th October 1937 | |
| -4- RM{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}4/MR.6.10.37. about a complete cure of the oil leak, at the same time allowing the felts to be deleted. From the results of these tests, and also from past experience of high speed running of our engines, we consider the felt retainers to be undesirable features. Conclusion. --------- We have made an effort to cure this leak by small modifications to the existing design. One reason for this is the expense of drastic alterations to the crankshaft. It now becomes obvious, that the further suggested experiments are worth while. With reference to the groove in the main bearing, although the first results look promising, we would require a lot more experience regarding the effect on bearing metal adhesion etc. To obtain data in this respect a Wraith engine will shortly be running an endurance test, having the tail main bearing modified in this way, in conjunction with endurance of exhaust valves. A Phantom III engine running an endurance test at the present time has been modified accordingly, and the felts deleted. This particular engine leaks very badly with the std. Ph.III system, i.e. 'blower' arrangement with felts sandwiched between the crank flywheel flange and the end covers, and although a considerable improvement was effected by the fitting of the scheme R.M.458 the leak was not completely cured. Further investigation is to be done on Ph.III system. The grooved bearing ( Rm.{William Robotham - Chief Engineer}458 ), has been instructed for the six Wraith cars which RHC{R. H. Coverley - Production Engineer} is building, but this does not mean that we intend to make this final, and depends on what success we have with the alternative scheme previously mentioned. RM{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||