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 ignition system components for the 4-EX vehicle after its return from America.
Identifier | ExFiles\Box 34\1\ Scan252 | |
Date | 21th June 1921 | |
x 2572 Extract from R2/G21.6.21. REPORT ON 4-EX JUST RETURNED FROM AMERICA. High Tension Distributor. X.800 X.3309. X.4275. One of the chief defects still remaining appears to be the jump spark distributor is blind, that is, no one can see the distance and concentricity between the rotor and the distributor head. We notice you have fitted electrodes of some better metal. We do not know whether this is platinum, or silver, or nickel. Platinum of course is preferable, but is so extremely expensive that one feels inclined to try pure nickel or monel metal electrodes. Safety from Backfiring. X.4275 X.800. We also notice that you have added our trailing horn to the distributor rotor to prevent backfiring on the make. Care should be taken in arranging the timing of this that the normal spark takes place on the first 1/8" of the rotor. Condenser. X.4275. X.2512. Regarding the condenser, we are a little bit surprised that this is effective, Mr. Clark having informed us that all the plates should be very close to the connections (and not have to wander along a great length of tinfoil) This we understand, is how it is carried out in magnetos in which the break contacts appear to last so well. In the ignition fitted to 4 EX. there is a quantity of black material which has oozed out of the condenser, which makes | ||