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).
Faults with defective sparking plugs and engine pinking/detonation.
| Identifier | ExFiles\Box 146\2\ scan0019 | |
| Date | 31th December 1936 guessed | |
| -7- 25. DEFECTIVE SPARKING PLUGS. December quarter C.C. 9 9 C.P. Previous quarter C.C. 3 3 C.P. Six months ------------ 12 ------------ 3 1/8 litre B. 16.DK - 38400 kms.- Fitted 6 850 type KLG. plugs charged owner as these gave trouble after 1.400 kms (misfire at 80 K.P.H.), we fitted a set of Bosch plugs type W45/I. B. 34.BN{W.O. Bentley / Mr Barrington} - 27270 kms.- Fitted 6 type 850 KLG. plugs,at 29368 kms these caused misfire at 70.K.P.H., now replaced them by 6 Bosch plugs type W.145/I. B. 47.EJ - 10000 kms.- Owner complained of misfiring we sent him a set of new KLG. plugs 850 type to Marseille. B.174.EF - 21821 kms.- Misfiring, fitted 6 new KLG. plugs type 850. 4 1/4 litre B. 72.HK{Col. T. Harker - Sales} - 830 kms. - (Max. speed only 80.K.P.H.) Fitted 6 early type KLG. plugs. B. 72.HK{Col. T. Harker - Sales} - 1657 kms.-Repetition complaint (misfire at 90 K.P.H.) Fitted 6 new Bosch plugs type W.145/I. B. 53.GP - 10341 kms.- (misfiring) Fitted 6 new KLG. plugs type 850. B. 53.GP - 11201 kms.- repetition complaint (misfiring at 120 K.P.H.) Fitted 6 new Bosch plugs type W. 145/I. B.106.HK{Col. T. Harker - Sales} - 6926 kms.- Misfiring at 2700 R.P.M. and upwards. Fitted 6 new Bosch plugs type W. 145/I. Since fitting Bosch type W.145/I plugs to certain of the above cars, we have not received any further complaints. ---------- 26. PINKING OF ENGINE DETONATES. December quarter C.C. C.P. Previous quarter C.C. 1 1 C.P. Six months ------------ 1 ------------ We have had several complaints that engines detonate, same was found to be due to the petrol used. | ||