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).
Comparative chart of 30 indicator diagrams for a 20 HP Rear component under various test conditions.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan088 | |
| Date | 3rd January 1931 guessed | |
| SHEET I Col: I Row 1: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. LIFT .010" H.P. VALVE DRILLED .055" DIA. 450 R.P.M. 1" STROKE . 25°C. Graph: 1.23 D", 54.6% Row 2: 20 HP. REAR. 65/75 LB. HIGH PRESSURE. .025" DIA. AIR VENT. LIFT .010" H.P. VALVE DRILLED .055" DIA. 450 R.P.M. 1" STROKE. 25°C. Graph: 1.45 D", 54.5% Row 3: 20 HP. REAR. 65/75 LB. HIGH PRESSURE. .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .055" DIA. 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 3.42 D", 72.9% Row 4: 20 HP. REAR. 65/75 LB. LOW PRESSURE. .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .055" DIA. 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 2.1 D", 53.1% Row 5: 20 HP. REAR. 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .055" DIA. 70 R.P.M. 4" STROKE. 25°C. Graph: 4.12 D", 78.2% Row 6: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050 H.P. VALVE DRILLED .055" DIA. 70 R.P.M. 4" STROKE 25°C. Graph: 3.46 D", 75.4% Col: II Row 1: 20 HP. REAR. 65/75 LB. LOW PRESSURE AIR VENT BALL REMOVED. DAMPER FILLED TO STD. LEVEL. 450 R.P.M. 1" STROKE 25°C. Graph: 1.17 D", 50% Row 2: 20 HP. REAR. 65/75 LB. HIGH PRESSURE AIR VENT BALL REMOVED. DAMPER FILLED TO STD. LEVEL. 450 R.P.M. 1" STROKE 25°C. Graph: 1.40 D", 50.2% Row 3: 20 HP. REAR. 65/75 LB. LOW PRESSURE AIR VENT BALL REMOVED. OIL LEVEL STANDARD 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 4.15 D", 86% Row 4: 20 HP. REAR. 65/75 LB. HIGH PRESSURE AIR VENT BALL REMOVED. OIL LEVEL STANDARD 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 3.33 D", 85.5% Row 5: 20 HP. REAR. 65/75 LB. HIGH PRESSURE AIR VENT BALL REMOVED. OIL LEVEL STANDARD. 70 R.P.M. 4" STROKE. 25°C. Graph: 4.71 D", 88.4% Row 6: 20 HP. REAR. 65/75 LB. LOW PRESSURE AIR VENT BALL REMOVED. OIL LEVEL STANDARD 70 R.P.M. 4" STROKE 25°C. Graph: 4.07 D", 88.2% Col: III Row 1: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. LIFT .004" H.P. VALVE DRILLED .032" DIA. 450 R.P.M. 1" STROKE. 25°C. Graph: .87 D", 38.9% Row 2: 20 HP. REAR. 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. LIFT .004" H.P. VALVE DRILLED .032" DIA. 450 R.P.M. 1" STROKE. 25°C. Graph: 1.05 D", 39.3% Row 3: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 3.07 D", 79.8% Row 4: 20 HP. REAR. 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 3.23 D", 69.5% Row 5: 20 HP. REAR. 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 70 R.P.M. 4" STROKE. 25°C. Graph: 3.91 D", 82.7% Row 6: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 70 R.P.M. 4" STROKE. 25°C. Graph: 4.46 D", 77.8% Col: IV Row 1: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STANDARD LIFT H.P. VALVE DRILLED .032" DIA. 450 R.P.M. 1" STROKE 25°C. Graph: 1.31 D", 55% Row 2: 20 HP. REAR. 65/75 LB. HIGH PRESSURE STANDARD H.P. VALVE DRILLED .032" DIA. 450 R.P.M. 1" STROKE. 25°C. Graph: 1.24 D", 45.4% Row 3: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 3.42 D", 84.4% Row 4: 20 HP. REAR. 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 4.05 D", 85% Row 5: 20 HP. REAR. 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 70 R.P.M. 4" STROKE. 25°C. Graph: 5.39 D", 81% Row 6: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 70 R.P.M. 4" STROKE. 25°C. Graph: 4.46 D", 84% Col: V Row 1: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. LIFT .010" NO HOLE IN H.P. VALVE 450 R.P.M. 1" STROKE. 25°C. Graph: 1.01 D", 47.1% Row 2: 20 HP. REAR. 65/75 LB. HIGH PRESSURE. .025" DIA. AIR VENT. LIFT .010" NO HOLE IN H.P. VALVE. 450 R.P.M. 1" STROKE. 25°C. Graph: .99 D", 43% Row 3: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE NOT DRILLED 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 3.48 D", 85.5% Row 4: 20 HP. REAR. 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE NOT DRILLED 130 R.P.M. 2 1/2" STROKE. 25°C. Graph: 4.05 D", 86.0% Row 5: 20 HP. REAR. 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE NOT DRILLED 70 R.P.M. 4" STROKE. 25°C. Graph: 4.13 D", 90% Row 6: 20 HP. REAR. 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE NOT DRILLED 70 R.P.M. 4" STROKE. 25°C. Graph: 4.84 D", 91.0% Common Y-Axis Label for all graphs: 154 LB/D" | ||