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).
Report page with a graph detailing oil consumption tests for various piston and ring configurations.
| Identifier | ExFiles\Box 132\4\ scan0098 | |
| Date | 19th October 1937 | |
| -6- consumption under certain conditions. But against this, since adopting the extra oil supply we have had no complaints of seized pistons. It appears, therefore, that for future engines we should retain the extra oil hole and use correctly designed rings to control the extra oil supplied. Continued. FIG. III 25/30 OIL CONSUMPTION TESTS. R.R. SPLIT SKIRT PISTONS. MOTORINE 'C' OIL. PRESS = 26 LB/D". OIL VISCOSITY - 70 SECS. REDWOOD No 1 SCALE AT 100°C. 28,000 " " " " " 0°C GRAPH AXES: Y-AXIS: OIL CONSUMPTION (PTS/HR.) X-AXIS: HRS. RUN CURVE LEGEND: CURVE ① 'L' SECTION 2ND COMP. RING, OTHER RINGS STANDARD ② REPEAT OF ① BUT WITH NEW PISTONS, RINGS & CYLINDER BLOCK. ③ AS ② BUT WITH EXTRA OIL HOLE IN CONN ROD BLANKED. ④ 'L' SECTION SCRAPER RING RM.{William Robotham - Chief Engineer} 201, OTHER RINGS STANDARD. ⑤ 4 RING PISTON WITH STOPS. PLAIN COMPRESSION RINGS & STD. TYPE SCRAPED. ⑥ PISTON & RINGS AS IN ⑤ BUT NOT STOPPED. ⑦ AS ⑥ BUT 3RD COMP. RING 'N' SECTION. MTHS{Reg Matthews} 7.1.37 | ||