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).
Endurance run test of different types of connecting rod bearings.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan250 | |
| Date | 16th September 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/ACL/LG16.9.25. C To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to CJ. BJ. c. to RD. E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} ORIGINAL EAC. CONNECTING ROD BEARINGS. X8030 We have tested the following types of con. rod bearings by means of an endurance run at high speed on the test bed. Two standard rods E.71939/40. Two nickel steel rods with the improved metalling - cross slots added according to drg. E.73765/6. Two mild steel rods with the improved metalling as above. The conditions under which the test was run are as follows :- Full load - speed 3000 r.p.m. Temp. of oil supplied to bearings 100°C - oil pressure 15 to 25 lbs/sq.in. - duration of run 12 1/2 hrs. At the end of this time the oil pressure started to fall and the bearings were taken down for inspection. Inspection showed that the general condition of the rods was bad. The improved metalling - with the added cross slots - certainly seemed an improvement on standard as the metal, although in some cases cracked, did not leave the rod. We are not able to make a definite statement regarding the merits of either of the above rods on the results of this one test but are continuing and shall next test the rods with the steel and bronze bushes. Hs{Lord Ernest Hives - Chair}/ACL. | ||