The wear of tungsten and platinum ignition contact breaker points due to the presence of oil vapour.
| Identifier | ExFiles\Box 163\7\ img086 | |
| Date | 31th December 1926 | |
| Contd. -2- EFC {E. Fowler Clarke - Electrical Engineer} 5/T31.12.26. by running tungsten points on the Delco-Remy contact breaker with otherwise our own ignition system. Sample in Envelope III. The evidence of the screw point in this case has been filed away. The evidence from the lever point is that of the presence of oil. It will now be appreciated that in this matter we recognise three different degrees - (a) Very rapid burning away of points on our own ignition due to the presence of oil vapour. (b) Points - either platinum or tungsten - requiring attention after about 5,000 miles and run on our own ignition in the absence of oil vapour. (c) Points running for 10,000 miles without attention, and 25,000 miles without replacement, as described by CY. on the Delco-Remy ignition contact breaker, and presumably also on the American Bosch, though we have not yet proved this on the U.S.A. Bosch equipment which CY. has sent to us. EFC. {E. Fowler Clarke - Electrical Engineer} | ||
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).