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).
Continued letter discussing engine oil consumption, temperature, and potential crankcase leakage.
| Identifier | ExFiles\Box 133\1\ scan0065 | |
| Date | 1st November 1926 guessed | |
| 9447C. 11/88. Rudge-Whitworth, Ltd. Continued Letter to Messrs. Rolls-Royce Ltd. Sheet No. 2. find, as you are no doubt aware, that smaller diameter exhaust valves will increase your head diameter, and adversely affect your power. The oil consumption of the engine should be one third of a pint of oil per hour, at 5,000 R.P.M. a minute, assuming the temperature of the oil as it leaves the return pipe is 140-150°F.{Mr Friese} If the oil consumption is very much higher than this at this speed we should imagine that the return side of the pump is not functioning correctly, and you may consider it worth while returning the crankcase to us for examination and test. If it were a standard engine we should expect oil to leak from the left hand bearing at any speed above 4,000 R.P.M. onthe bench, but the flat floor of the crank-case in your engine was adopted to overcome this. From a previous letter of yours we gather that the oil temperature has been very high during tests on water cooling where there has been no crankcase cooling. This would undoubtedly affect the leakage, and there is another point which I forgot to mention on the telephone to your Assistant, and that is, if the crankcase has been running at an excessive temperature there is a possibility that the Cont'd.... | ||