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).
Test report on engine components including front suspension, pistons, connecting rods, and bearings.
| Identifier | ExFiles\Box 179b\3\ img375 | |
| Date | 25th March 1933 guessed | |
| - 3 - FRONT ENGINE SUSPENSION TO LEC 3285. Soft rubbers were fitted to the front suspension and torque reaction dampers screwed up choc-a-bloc then screwed one full turn back. This setting gave the best results for steadiness of engine, torque reaction and steadiness of front of car. It was found at the finish of the test that the K.S. bracket holding the front cross member to the frame had broken the lip that is turned inwards and held by two bolts. The O.S. bracket was not fractured. The ferodo lined gear box support bearing, gave no trouble. PISTON TO LOP E 100158 LB 3317 (6-1 COMP. RATIO) WITH INCREASED BEDDING SURFACES. A slight knock from the pistons was heard when starting up from cold after 6.880 miles. The knock still remained after the engine had warmed up. The pistons were in good condition when taken out and examined. Slight over oiling was noticeable at finish of mileage when engine idled. At high speeds it is assumed that the piston rings do not cope with the saturated oil vapour that is prevalent in the crankcase under pressure which accounts for the high oil consumption. The amount of carbon deposit on the piston heads was no more than normal. CONNECTING RODS LOP E 100/156 RR SCHEME 107 E.{Mr Elliott - Chief Engineer} 100026/7 CONNECTING RODS AND CAPS ( RODS MACHINED ALL OVER ) E.{Mr Elliott - Chief Engineer} 100028 BIG ENDS BUSHES WHITEMETAL. The white metal of the Big End Bushes failed after 9673 miles. The top half of the bearings showed up worst. There was only one bottom half bearing that was in a poor condition. The metal showed fractures. It is most possible that the heat was the cause. Just previous to the failure tests had been carried out with less oil in the base and low oil pressure. It is probable that the damage was caused during these tests, the metal afterwards broke up and pounded away. | ||