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).
Test procedure for ignition system components, detailing current, voltage, and running conditions.
| Identifier | ExFiles\Box 70\4\ scan0027 | |
| Date | 15th April 1932 | |
| AC26/15.4.32 X8781 CL -2- A convenient way of doing this is to keep a small resistance made up non-inductively which, when placed in circuit with the 12 volt battery, ammeter, and contact breaker, just permits the passage of 1.00 ampere when the contacts are closed. The make ratio of the distributor can then be set by adjusting and locking the contact points in such a position as to permit the passage of .55 ampere with the contact breaker running at 700 r.p.m. (This averages out any slight differences in the gaps due to the six points of the cam). The test consists of a preliminary run of 5 mins. at 700 r.p.m. under above conditions, with the spark gaps set to 6.5 mm. (4) This test consists in running for 5 mins. under working conditions, i.e. on 12 volts, but with the high tension wire disconnected from the coil i.e. with the secondary open circuited. The running current at the end of this test must not exceed 1.20 amperes. During the test, a distributor H.T. rotor may also be tested (for insulation) as described under distributor production test. (5) The coil shall be run normally but at 18 volts for 30 mins. and then immediately switched over to 8 volts when no missing shall occur on the 6.5 mm. spark gaps. EFC. | ||