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).
Experiments on cylinder suction, scraper rings, and the use of Zephyr pistons.
| Identifier | Morton\M22\ img010 | |
| Date | 21th February 1919 | |
| To EH & E.{Mr Elliott - Chief Engineer} from R.{Sir Henry Royce} R6/IB12515. With reference to the suction in the cylinder having no effect on the oil passing the piston, I am quite willing to agree with Mr Hives' experiments, although they do not agree with Mr Barrington, who says that the scraper ring is not effective unless it is fitted with the anti-suction annulus above the scraper ring, so that we have two experimenters who are not in agreement. Personally I have lost all faith in theorising unless it is confirmed by experiment. Referring to our extra oiling device, this may not be needed at all when the scraper rings are fitted and the baffles are removed. This might be a subject of experiment with a new engine. Moreover, one feels as though in town driving, the extra oiling as arranged by us rarely comes into play, because most drivers do not open the throttle fully. If, however, the oil drops on the crank pins, it ought, at the slow speeds mentioned by Mr Hives, to have less tendency to get up into the cylinders than if it is taken through the cylinder walls. This might be proved. I also quite agree with Mr Hives that the Zephyr pistons should be pushed on with all possible speed, as these appear to have many virtues which we cannot get with any other piston. I have asked for these to be fitted to car 49GB several times, with the hope of getting them. W B 3227 (200 H) (2'V' wks 21-2-19) C 100? | ||