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).
The performance and issues with a Lucas Magneto and other components on car 7-EX after 10,000 miles.
| Identifier | ExFiles\Box 40\2\ Scan189 | |
| Date | 11th May 1927 | |
| TO HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} X8793 R1/M11.5.27. Copy to WOR.{Arthur Wormald - General Works Manager} BY EFC. B LUCAS MAGNETO ON 7-EX. ETC. X8793 As far as I know this has behaved quite satisfactorily during its 10,000 miles in France. MAGNETO CONTACT MAKER. On examining its behaviour in England however I found it was unreliable because the fibre of the L.T. contact maker had absorbed moisture from our damp English atmosphere, and had become tight on the rocker pin. The friction however was so slight as almost to escape detection, but owing to the light springing of this rocker arm the platinums at slow speed failed to make contact, and therefore the slow running was defective. IGNITION PLUGS. The only other trouble with the whole ignition on this car appears to be with the Lodge plugs (which have behaved so well otherwise) becoming oxydised in the points, possibly due to the weak mixture which our cars are capable of using. THROTTLE. The previous report that we thought the throttle valve was sticking, we believe now to be due to the defective slow running, the carburetter being set for very weak mixture on the low speed jet. The carburetter was not maked for normal setting. MAGNETO TIMING. You will remember that I suggested a second hexagon on the adjustment of the magneto timing. I think this is necessary to avoid fear of damage to other parts. R.{Sir Henry Royce} | ||