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).
Extract detailing proposed engine modifications to improve excessive oil consumption.
| Identifier | ExFiles\Box 72\1\ scan0026 | |
| Date | 29th April 1925 | |
| Extract from R1/M29.4.25. (X.8770 X.2565.) X8980 EXCESS OIL CONSUMPTION EAC. X.8980 X.8040 So far the only thing which has shewn an improvement is the L. shpaed ring, but we fear these may not be enough as we want a change from 300/400 MPG. to 1200/1500 MPG., so we have in hand at Derby, designs, for which have been sent this week (1) Cutting the cyl. trunks to drip the oil to the extreme sides. (2) Some simple splashers that may prevent the spray getting into cyls., and also reduce the amount of spray. (3) Some changes to the pistons giving 3 or 4 possible advantages, including some slight improvements in engine effcy., and general coolness of water and oil, but mainly to reduce the quantity of oil that passes the piston. Rings are raised to give more surface above the piston pin against wear and knocks, hoping it will keep the oil down. Lower compression has allowed us to have a hollow shaped head to the piston. We are trying also a scraper ring in the skirt in spite of the split piston, and un-split piston, and a stiffer bottom to the split piston. Some of these should shew an improvement. R.{Sir Henry Royce} | ||