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 testing of tall battery ignition coils encased in Redmanol synthetic resin.
| Identifier | ExFiles\Box 45\4\ Scan262 | |
| Date | 14th October 1924 | |
| X40796 To R & E.{Mr Elliott - Chief Engineer} from EFC. c. to CJ. & PN.{Mr Northey} c. to EY. Wpr. c. to Da.{Bernard Day - Chassis Design} EP.{G. Eric Platford - Chief Quality Engineer} EFC1/T14.10.24. X.4079b TALL BATTERY IGNITION COILS IN REDMANOL CASES. All the Redmanol encased coils dealt with in this report are precisely similar to our present standard stabalite encased coil as regards windings, etc., the only difference being that they are encased in moulded cases of synthetic resin type of material known as "Redmanol". Previous references in the present connection are your note R2/M29.5.24, and our answer EFC5/T3.6.24. (The only other coils referred to are present standard stabalite encased coils). In all we have six of these coils, designated TR{Capt. F. W. Turner - Finance}1./2/3/4/5/6, which have been variously tested both on the bench and on experimental cars, as detailed below, and with these coils there has been no case of failure in ordinary running circumstances. It is thought that a short history of each coil might be given individually. TR.{Capt. F. W. Turner - Finance}1. This was received in Nov. last, and was first production tested to the present standard production test for the stabalite encased coil, with satisfactory results. It was then, on 20.12.23, placed on experimental chassis 7-GII on 7.2.24 and underwent a thrashing test. This consists of running the car in such a manner as to get the coil as hot as possible in position, and then determine the maximum external spark gap (between the H.T. terminal of the coil and the central terminal of the distributor) which the coil will stand without allowing the engine to misfire under the worst conditions of the engine, for instance, retarded spark, weak mixture, and full throttle. This was found to be .100". The coil was removed from 7-GII on 7.2.24 having done 2370 miles. On 9.4.24 it was placed on chassis 3-GII and ran satisfactorily on this chassis for 3952 miles (total mileage 6322). Contd. | ||