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 causes of overoiling and the factors that control oil consumption.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan306 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/ACL/LG151225 13 lbs/sq.in. at pressure without any ill effects on the bearing. SUMMARY OF FACTORS CONTROLLING OIL CONSUMPTION AND THEIR RELATIVE IMPORTANCE. During our investigation of the cause of overoiling or excessive consumption, we have arrived at the conclusion that there are three chief factors controlling this and are, in order of importance :- (1) oil discharge through the bearings. (2) Piston rings. (3) Pistons. (1) Oil discharge through bearings. We place this first in order of importance because by reducing this we are able to reduce the consumption practically to as small a value as we please, as was shown on the road consumption curves. We see also that the consumption increases at a smaller rate than the increase of flow. This is fortunate because the effect of wear of the bearings will be less marked. It has also been shown that the effect of bearing wear on consumption should be less with three main bearing feeds than seven. Therefore this, considered with the previous stated fact, is a point in favour of reducing the consumption by means of reducing the flow through the bearings because its efficiency in this direction would tend to be of long duration. (2) Piston rings. Different types of rings have marked contd :- | ||