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).
Graph comparing oil consumption for different piston and piston ring configurations.
| Identifier | ExFiles\Box 148\1\ scan0214 | |
| Date | 4th December 1939 guessed | |
| PISTON RING COMPARISONS OIL CONSUMPTIONS S 106 TABLE OF CONFIGURATIONS: 1. STD. PISTONS & RINGS. - BLOW-BY 40 CU FT/HR 2. STD. PISTONS & "CELLOTIN" RINGS. - BLOW-BY 40 CU.FT/HR (Conditions for 1 & 2: OIL FLOW THRO' BRGS. 37.7 GALLS/MIN, MAIN OIL PRESS. 36 LB/□") 3. STD. PISTONS & 'CELLOTIN' RINGS - BLOW-BY 44 CU.FT/HR 4. NEW PISTONS E.W. 2115 (MOD. EXS. 1550) HEPWORTH & GRANDAGE HIGH PRESSURE RINGS FITTED. - BLOW-BY 50 CU FT/HR (Conditions for 3 & 4: OIL FLOW THRO' BEARINGS, 48 GALLS./MIN, MAIN OIL PRESSURE 50 LBS/□", BIG ENDS GROOVED TO R.M. 587.) 5. NEW PISTONS E.B. 2844 (MOD EXS 1550) HEPWORTH & GRANDAGE HIGH PRESSURE RINGS FITTED. .020 INS. SIDE CLEARANCE. - BLOW BY 42CU.FT/HR. (Conditions for 5: 2 - .046 INS DIA. HOLES IN CON. RODS.) AXIS LABEL: OIL CONSUMPTION PTS/HR RED ANNOTATION: 4000 R.P.M. FULL THROTTLE | ||