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).
Summary of engine test results regarding cylinder liner temperatures, pre-ignition, and oil flow.
| Identifier | WestWitteringFiles\P\October1926-November1926\ Scan063 | |
| Date | 10th October 1926 guessed | |
| contd :- -5- The chief thing this latter test proves is that the cyl. skirts are cooled to a certain extent by the oil spray as would be imagined. SUMMARY. (1) Up to the present after 39 hrs. running we have not experienced any trouble with liners, pistons or rings on this engine. (2) The liner temperature is in excess of the alum. cyl. temperature. At 1.5" from the top it is 21°C higher at the speed of max. output giving 75 lbs/sq.in.BMEP. (3) Pre-ignition raises the liner temperature at 1.5" from the top by 8°C. The pre-ignition was not violent. (4) Reduced oil flow slightly raises the temperature of the unjacketed cylinder skirt. It is conceivable that with larger cylinders and higher M.E.P's, the liner temperatures would be higher than recorded during these tests and coupled with pre-ignition could become considerably higher. Again, the amount of shrinkage or 'fit' of the liners could possibly influence the temperature. On the first opportunity we intend to repeat these tests on the Falcon X. with the dry liners. Hs{Lord Ernest Hives - Chair}/A.{Mr Adams} C. Lovesey. | ||