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).
Letter discussing engine lubrication, oil acidity testing during trials with unknown fuels, and instructions for taking oil samples.
| Identifier | ExFiles\Box 32\1\ Scan045 | |
| Date | 29th January 1918 | |
| contd. -2- R6/W29.1.18. If we obtain any further information we will send it to you without waiting for you to ask us, but I think the risk of damaging the engine is so small that one might use almost anything for a short time, providing one knows their engine well and is prepared to take the cylinders off and examine them and the lubricating oils. In conclusion one suggests that mineral oil only, (which does not become acid) is used to lubricate the engine during the trial of any unknown, or combination of fuels, that after running for say 10 hours, part of the oil in the crank chamber should be withdrawn and examined for acidity by a chemist and compared with trials of the same engine on standard fueld; it found alright, it should again be examined after 100 hours actual running to prove first test. Yours sincerely, + P.S. Be careful that one gets a sample of the oil that has been in use i.e. withdraw half a litre, then take some of the second half litre for test. (upside down text at bottom) H.R. 235A (500 T) (S.D.) 40R. 26-4-17. Bim. 2/155/13. | ||