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).
Comparison test graph of Lodge 641 three-point and KLG FLB 30X spark plugs.
| Identifier | ExFiles\Box 162\2\ img003 | |
| Date | 3rd June 1941 | |
| COMPARISON TEST OF LODGE 641 THREE POINT AND KLG FLB 30X PLUGS. TESTS PERFORMED ON CHASSIS 3 B.W. NO. 6 CYL. BEING USED THROUGHOUT. LODGE 641 T.P. CURVES SHOWN THUS. KLG FLB 30X. PICK-UP. SLOW RUNNING. HIGH SPEED. MAX. VOLTAGE ACROSS POINTS (K.V.). PLUG GAP. Y-axis values: 12.0, 10.0, 8.0, 6.0, 4.0, 2.0, 0. X-axis values: .020, .025, .030, .035, .040. | ||