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 results for various engine bearing designs, alloys, and lubrication schemes.
| Identifier | ExFiles\Box 115\2\ scan0579 | |
| Date | 19th June 1940 | |
| Cont'd.{John DeLooze - Company Secretary} - 2 - Lr{Mr Ellor}/AT.2/EAH.19.6.40. 1. Effect of oil Distribution. Mean figure of merit. (a) By's scheme I43/I44 with deep semi-grooved 1% tin bearing, two oil holes drilled in centre journal and flats on crankshaft. 163 (b) As above but with oil holes in centre journal omitted. 137 (c) Oil pressure increased from 60 to 90 sq/ins. 100 (d) Semi-grooved 117 (e) Michell chamfer and semi-grooves. 137 (f) Allison oil holes. To be tested. 2. Alternative Alloys. (a) 1/2% silver. 157 (b) L.A.4. (thin shell bearing.) 163 (c) 10% silver. (A.S.) 163 3. Modified Bearing Design. (a) Deep flange. 132 (b) Thin shell. (2 piece bearing.) 115 (c) Bearing locked to crankcase to prevent nip in. 115. B. Reduced Oil Supply. (a) Running at 3000 r.p.m. the main oil pressure was reduced from 60 to 20 lbs sq/ins before seizure of the 1% tin bearing took place and from 60 to 2 lbs/sq. in. before seizure of the 1/2% silver bearing occurred. (b) With the 1% tin centre main bearing the oil supply was cut off eight times in 30 second intervals before seizure took place. Applying By's scheme the oil supply was cut off 25 times with no sign of seizure. A 1/2% silver bearing failed the second time the oil supply was cut off. C. Fatigue Properties. One 1/2% silver bearing only tested on the single panel rig by endurance, failed after 73 1/2 hours in a similar manner to the failure of this alloy on the main engine. D.{John DeLooze - Company Secretary} Cyclic Loading. Cyclic loading tests produced failure of 1% tin, 2% tin, 1% tin lead coated and 1% tin treated bearings at speeds below 3000 r.p.m. but failed to produce failure of 10% silver, 1/2% silver and Vandervell tri-metal bearings under these condition | ||