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).
Description of a Delco-Remy double breaker distributor system, detailing its cam, contact points, and condenser.
| Identifier | ExFiles\Box 163\7\ img133 | |
| Date | 20th October 1930 guessed | |
| -2- To accurately time the two levers in relation to one another there is a similar arrangement whereby one of the breakers complete can be moved about the cam as centre, the other breaker being fixed. This latter arrangement is a special Delco-Remy patent. A three lobe cam is used thus giving six breaks per revolution the breakers sharing the wear on the points thereby doubling the contact point life. The load on the points as measured was 1 lb. 2 ozs. on one breaker and 1 lb. 6 ozs. on the other. The make ratio as set by the makers was found to be .690 and the setting of the contact point gaps .025". An interesting point about these double breaker type of contact breakers is that a high make ratio can be obtained without having to set the contact points too close together. On our own distributor to obtain a make ratio of .70 we should have to close up the gap to about .008", an impossible setting for satisfactory working on the chassis. With a high inductance high resistance coil such as the Delco-Remy outside primary coil which dispenses with a ballast resistance, a high make ratio is essential for satisfactory high speed working. The condenser, of very simple circular construction, is neatly housed outside the casing; its capacity is .216 microfarads at 18°C. | ||