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).
Particulars of valve springs and a loading chart for Falcon X valve bounce tests.
| Identifier | ExFiles\Box 43\3\ Scan117 | |
| Date | 1st January 1929 | |
| FALCON X VALVE BOUNCE TESTS PARTICULARS OF VALVE SPRINGS | | DOUBLE SPRINGS | TRIPLE SPRINGS | |---|---|---|---|---|---| | | OUTER | INNER | OUTER | CENTRE | INNER | | | E.28524 | E.28528 | E.28485 | E.28487 | E.28486 | | SIZE OF WIRE | 11SWG (∙116) | 14SWG (∙080) | 13SWG (∙092) | 14SWG (∙080) | 16SWG (∙064) | | MEAN DIA. OF COILS | 1∙284 | ∙938 | 1∙308 | 1∙046 | ∙810 | | No. OF WORKING COILS | 6½ | 8 | 8 | 8½ | 10 | | RATING | 19∙6 lbs/in | 9∙2 lbs/in | 6∙0 lbs/in | 6∙57 lbs/in | 4∙7 lbs/in | | STRESS (VALVE OPEN) | 51500 lbs/sq in | 53500 lbs/sq in | 69000 lbs/sq in | 62000 lbs/sq in | 63000 lbs/sq in | | STRESS (VALVE CLOSED) | 70500 lbs/sq in | 73500 lbs/sq in | 81000 lbs/sq in | 77000 lbs/sq in | 80000 lbs/sq in | LOADING CHART CHART AXES: Y-axis: LOAD IN LBS. X-axis: VALVE LIFT (INS.) CHART LINES: DOUBLE SPRING TO L.E.C. 2287 TRIPLE SPRING TO L.E.C. 2281 CHART ANNOTATION: VALVE LIFT = ∙463" SIGNATURE & DATE: (Signature) 1∙1∙29 | ||