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).
Sparking plug tests comparing different models from Lodge and K.L.G.
| Identifier | ExFiles\Box 162\6\ img151 | |
| Date | 21th May 1932 | |
| X4425. X1918 To Hs.{Lord Ernest Hives - Chair} from Hs{Lord Ernest Hives - Chair}/G.W.Whyman. c. to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} REPORT ON SPARKING PLUG TESTS. The first tests were carried out on 25-EX with the following results - (a) Lodge C.3. Slight missfires at slow speeds and picking up. Tested 9.5.32. (b) Lodge X.288 Slow running O.K. Bad missfires picking up. Tested 9.5.32. (c) Lodge CH.3 No missfires of any description during run of 70 miles. Tested 10.5.32. (d) K.L.G. K.1. Slow running O.K. Only 4 missfires picking up during run of 125 miles. These missfires were only after violent braking of car and were probably due to carburation than plugs. Tested 11.5.32. The next tests were carried out on a production chassis No. 214.AMS. (e) K.L.G. KS.5. Missfires slow speeds and picking up. Tested 19.5.32. (f) Lodge CH.3. Missfires occasionally at slow speeds. - Bad missfires picking up after run of 50 miles. Tested 19.5.32. From tests (c) and (f) it will be seen that Lodge CH.3. plugs missfired in 214.AMS. but not in 25-EX. On 21.5.32. these plugs were again fitted in 25-EX and over a run of 25 miles no missfiring occurred. They were then fitted to 214.AMS. and after driving for 20 miles they missfired badly picking up. This rather points to something else besides plugs. Our next test will be to fit the magneto off 25-EX to 214.AMS, and also the magneto off 214.AMS to 25-EX, and try the same plugs in both cars. I might also add that the two sets of plugs run in 214.AMS missfire worse after the car has rounded a bend in the road or has been swinging round another car in passing same, which means that the petrol level in the carburetter float chamber is thrown at an angle, thus temporarily causing bad distribution. The same conditions, however, do not cause | ||