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).
V-series engine oil consumption, testing baffles and piston ring configurations.
| Identifier | ExFiles\Box 180\M3\M3.1\ img004 | |
| Date | 8th April 1925 | |
| R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF. HsV/LG8.4.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to HJ. DA.{Bernard Day - Chassis Design} c. to E.{Mr Elliott - Chief Engineer} EY. c. to Mor. S E C R E T. X8040 X8980 'V' SERIES - OIL CONSUMPTION. We have carried out tests on an EAC. engine on the test bench to which baffles were fitted inside the crankcase which prevented any oil being splashed on to the trunks of the cylinder which project into the crankcase. The object of these baffles was to produce, if possible, similar conditions to the 40/50. It was proved that the oil consumption with these baffles fitted was actually higher than without them. Consumption readings were taken before they were fitted, after they were fitted and again after they were taken out. We could remove the baffles without disturbing either the crankshaft or connecting rods. We have received reports from France that 93-NK which is running with pistons with grooves below each ring that the consumption is so far just over 300 m.p.g. This is very little different to the results obtained on 93-NK car which has just returned. The oil consumption on 93-NK car in France is now being measured with the car run at various maximum speeds. We are at present running pistons fitted with two rings in one groove. The top ring in each groove being approx. 50% weaker than the bottom one. The results so far do not show any improvement but further tests are necessary before we can contd :- | ||