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 Champion spark plugs L88, N8, and NA10.
| Identifier | ExFiles\Box 162\2\ img010 | |
| Date | 23th February 1940 guessed | |
| CHAMPION. L88. Sets on 5.B.IV 2.B.50 30.G.VII 10.B.V WXA.2. 1 set on transport car, to be compared with FLB.30XP on other transport car. Found to have lower firing voltage than AC.46 & N8, during tests on 12.B.I. 1 set on 30-G-VII, condition to be noted after mileage on B80 engine. N8. Long reach plug- Sets on 12.B.I 11.B.I 29.G.II Running OK on B809 Ripple, though cool. 1 case of misfiring on 12-B-I after 4738 miles. Running too hot after 12,920 miles in French tests Central electrode crumbled away on 1 plug. NA{Mr Nadin}10. unsuitable for road work; sets used on test beds. | ||