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).
Test notes on Lodge spark plugs concerning voltage measurements, wear, and misfiring causes.
| Identifier | ExFiles\Box 162\2\ img008 | |
| Date | 23th February 1940 guessed | |
| LODGE. 741. 1 set on 1-R-1. Voltages measured every 1000 miles. Tests to determine whether oxidation of points, or insulator leakage causes misfiring after a fair mileage. B14 Wear .003 after 1000 miles in 2-B-50. Firing voltages under pressure in Lab. rig, shows a decrease of approx 2 K.V. after 110 miles on 1-R-1. Not sufficient running for a definite verdict on these plugs. 640+641 Not tried on B60 or B80 or Ripple | ||