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).
Blueprint showing crank pin loading diagrams comparing a 4 1/4 Bentley and a 12 HP 4-cylinder engine.
| Identifier | ExFiles\Box 115\2\ scan0504 | |
| Date | 6th November 1939 guessed | |
| Title: CRANK PIN LOADING DIAGRAMS. Top of Diagram: TDC Bottom of Diagram: BDC Left Y-Axis Label: LB/SQ. IN. OF PROJECTED BEARING AREA Right Y-Axis Label: LB/IN2 Engine Comparison: 4 1/4 BENTLEY @ 4250 R.P.M. 12 HP 4 CYL. @ 4500 R.P.M. Data Table: Columns: BENTLEY | MYTH - WT. OF PISTON RINGS PIN LITTLE END: 2.02 lb | 1.16 lb - WT. OF BIG END: 1.03 lb | 0.91 lb - PROJ. AREA OF BIG END BEARING: 2.378 sq. in. | 1.638 sq. in. - CONN. ROD - CRANK: 3.53 | 2.87 Diagram Annotation: FIRING STROKE Footer Note: THESE DIAGRAMS INDICATE THE MAGNITUDE OF THE LOAD AT ANY CRANK ANGLE BUT DO NOT INDICATE THE DIRECTION IN WHICH THE LOAD ACTS. | ||