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).
The failure of connecting rods and whitemetal bearings from a 93-NK car.
| Identifier | Morton\M3.5\ img048 | |
| Date | 4th June 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}1/LC4.6.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RJ. c. to HO. E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} EY. c. to WJW. EAC. 'V' SERIES. CONNECTING RODS. X8030 We have received from France a set of connecting rods taken off 93-NK car. The con. rod bearings were found in a very poor condition when the rods were being dismantled in order to fit new piston rings. We are sending the rods to W.W. This is the 3rd. occasion on which the connecting rod bearings have failed in 21,000 miles The last set of rods have run just over 8,000 miles. It is reported that during this last run the oil has never dropped below 18 lbs. pressure. We know that it is difficult to get whitemetal to adhere properly to alloy steel rods. The 20 HP. is by no means free from this trouble. We are preparing a set of rods on which the white- metalling has been carried out very carefully. Hs.{Lord Ernest Hives - Chair} | ||