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 factors controlling overoiling on Phantom engines compared to Silver Ghost engines.
| Identifier | ExFiles\Box 16\1\ Scan105 | |
| Date | 4th May 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. RG.{Mr Rowledge} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to SY. WoP. c. to EP.{G. Eric Platford - Chief Quality Engineer} Hm.{Capt. W. Hallam - Head Repairs} +740 Hs{Lord Ernest Hives - Chair}/ACL1/LG4.5.26. FACTORS CONTROLLING OVEROILING ON PHANTOM ENGINES. +8980 It is general experience that the Phantom engine has been a greater offender with regard to overoiling than the Silver Ghost and numerous experiments have been made in the endeavour to determine the difference existing between these two engines which causes the trouble. From results of these experiments we consider that we have determined the chief factors affecting overoiling as applied to these engines. The chief factors are :- (1) Rate of oil flow through the bearings. (2) Piston rings. The following notes demonstrate the extent that these factors control the oil consumption and reference is made, at the end, to an additional factor which, although not influencing oil consumption to any appreciable extent, cause a smoky exhaust when running light, and is chiefly due to oil leakage down the valve stems. INFLUENCE OF OIL FLOW THROUGH BEARINGS ON CONSUMPTION. As cylinder wall lubrication is affected by oil thrown from the bearings, and the piston rings being unable to provide a perfect seal, it is quite reasonable to imagine that the oil contd :- | ||