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).
Falcon X engine valve bounce tests comparing double and triple spring setups.
| Identifier | ExFiles\Box 43\3\ Scan120 | |
| Date | 12th January 1927 | |
| FALCON X VALVE BOUNCE TESTS TEST N° 1. – LARGE DIA. DOUBLE SPRINGS TO LEC 2287. VALVE E28651. TOP WASHER E28530 WEDGES E28070 OUTER SPRING E28529. INNER SPRING E28528. ROCKERS & CAMSHAFT TO ARRGT DRAWING E27897. [Boxed Text] THE ARROW ON THE DIAGRAM SHEWS THE DIRECTION OF ROTATION OF CAMSHAFT THEREFORE THE TRACK OF THE VALVE SHOULD BE FOLLOWED IN THE OPPOSITE DIRECTION BOUNCE DIAGRAMS (INLET VALVE) [Diagram 1] LEAVES CAM NEAR END OF CLOSING PERIOD BOUNCE DIRECTION OF ROTATION OF CAMSHAFT 1350 R.P.M. (CAMSHAFT) (LOWEST BOUNCING SPEED) DIRECTION OF TAPPET ROLLER RELATIVE TO CAM VALVE LEAVES CAM DURING LIFT PERIOD [Diagram 2] 1550 R.P.M. (CAMSHAFT) DOTTED LINE IS THE NORMAL TRACK OF VALVE TOTAL RECIPROCATING WEIGHT = 7.87 OZS. (FOR PARTICULARS OF SPRINGS SEE SEPARATE SHEET) TEST N° 2. – TRIPLE SPRINGS TO LEC 2281. VALVE E28651 TOP WASHER E28488 WEDGES E28070 OUTER SPRING E28485 CENTRE SPRING E28487 INNER SPRING E28486 ROCKERS & CAMSHAFT TO ARRGT DRAWING E27897. BOUNCE DIAGRAMS (INLET VALVE) [Diagram 3] 1400 R.P.M. (CAMSHAFT) (LOWEST BOUNCING SPEED) [Diagram 4] 1550 R.P.M. (CAMSHAFT) TOTAL RECIPROCATING WEIGHT = 7.91 OZS. (FOR PARTICULARS OF SPRINGS SEE SEPARATE SHEET). | ||