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 comparing the performance of Lodge 640 single point and KLG FLB30X spark plugs.
| Identifier | ExFiles\Box 162\1\ img045 | |
| Date | 28th February 1935 | |
| COMPARISON TESTS OF LODGE 640 SINGLE POINT AND KLG. FLB30X PLUGS. TESTS PERFORMED ON CHASSIS 38TY No. 6 CYL. BEING USED THROUGHOUT. LODGE 640 S.P. CURVES SHOWN THUS _____ KLG FLB 30X ------- MAX. VOLTAGE ACROSS POINTS (K.V.) 12.0 10.0 8.0 6.0 4.0 2.0 0 PLUG GAP .020 .025 .030 .035 .040 PICK - UP SLOW RUNNING HIGH SPEED A34/G 28.2.35 | ||