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 plotting the speed at which the No.6 exhaust valve rides against the valve spring load for PI Unit BJ55.
| Identifier | ExFiles\Box 17\6\ Scan260 | |
| Date | 21th June 1934 | |
| ROLLS-ROYCE, LTD PRINT ROOM JUN 21 1934 DERBY. PI UNIT BJ55 WITH HIGH COMP. HEAD & E82448 CAMSHAFT SPEED AT WHICH NO.6 EXHAUST VALVE RIDES PLOTTED AGAINST SPRING LOAD ☉ LOAD AT 1st CHANGE OVER PT x LOAD AT MAX. LIFT RPM 3250 3000 2750 2500 ☉SEAT LOAD VALVE SPRING LOAD 50 60 70 80 90 100 120 140 160 180 200 220 LINE OF SLOPE 1/2 FIG 1. F.L.L.S. 116. VI. 34. | ||