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).
Peregrine engine oil temperature issues and proposing an experiment to increase oil flow to the main bearings.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page152 | |
| Date | 31th January 1933 | |
| 84027. To Sg.{Arthur F. Sidgreaves - MD} from E.{Mr Elliott - Chief Engineer} E.6/HP.31.1.33. c. Wdr, Hs.{Lord Ernest Hives - Chair} re Peregrine. Referring to your memo Sg.{Arthur F. Sidgreaves - MD}9/E.30.1.33, I feel very strongly that we ought to find out the value of the ribbed sump in France exactly under the same conditions which gave us a temperature of 130°C on the previous tests. Personally I do not think we have got to the bottom of the trouble yet. Comparing the Peregrine with the 20/25 engine it has the same power output and there is no reason why the heat to oil should be much different. The Peregrine is carrying more oil in the sump and has a smaller oil pump running faster delivering about the same oil flow. The Peregrine main bearings are larger in diameter and running faster than the present 20/25 but the oil gallery pipe and oil leads to main bearings are all smaller, being scaled down in size. It may be possible that the main bearings are not receiving sufficient oil thereby setting up extra friction. Hancock did report that after running, his engine suffered from tight bearings and the condition of the bearings after the test might be accounted for in this way. We are proposing an immediate experiment putting up the oil feeds to the main bearings, the same as the 20/25, which will increase the cross sectional area of the feed by 150%. The Bensport engine with its increased output is giving no trouble, and as regards the material of the upper half of the crankcase being cast iron we ran a 20/25 engine with C.I. upper half for some time with considerable success. We, therefore, think this latter feature cannot account for the difficulty. E.{Mr Elliott - Chief Engineer} | ||