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).
Ignition system performance, noting issues with magneto ignition when the engine is hot and at low speeds.
| Identifier | ExFiles\Box 54\5\ Scan316 | |
| Date | 9th December 1924 | |
| RR 238 (150 BKS.) (DD 451-9 12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. (3) To _________ Order No. WD {Mr Wood / Mr Whitehead} 48 Customer's No. _________ standard combination of 1# value ballast resistance and 22 gauge coil to be OK and sufficiently protected against serious overheating. Whilst the engine was still hot we changed over the ignition to magneto. With this ignition the car repeatedly failed to "pick up" without misfiring and in one instance took an appreciable time to resume regular firing. Otherwise the magneto appeared to be OK. Cold starting by hand was not tried but we have Test Dept confirmation that in several instances this is very difficult owing to the poor low speed performance fully retarded. Signed HEW This Sheet must be filed on completion of the work. | ||