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).
Comparing the test performance of a Delco Remy ignition coil against a standard and a Lucas coil.
| Identifier | Morton\M19\ img006 | |
| Date | 24th December 1930 | |
| To R.{Sir Henry Royce} from EFC. c. Sg.{Arthur F. Sidgreaves - MD} c. EV.{Ivan Evernden - coachwork} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} ORIGINAL EFC1/AD24.12.30. X.4284. DELCO REMY IGNITION COIL. In addition to the Delco Remy ignition distributor and contact breaker unit recently obtained and reported upon under cover of our EFC1/AD20.10.30. we also received a Delco Remy ignition coil. This has been put through a series of tests such as we have established as a sort of type test for ignition coils, i.e. primarily for those of our own manufacture. A copy of this up-to-date specification of test is attached for your information. Our present standard battery ignition coil will satisfactorily stand this series of tests, reaching No.13 when breakdown is intentionally made to occur by continuing the test for an indefinite number of hours. On the Delco Remy ignition coil being put through the same series of tests, after it had passed test 7 satisfactorily it failed almost immediately on a repetition of test 7 under paragraph 13, whereas our own present standard coils will continue satisfactorily on this test for several hours without breakdown. Upon dismantling and unwinding the coil the failure was found to be due to the fact that the windings were almost completely charred. A Lucas ignition coil recently tested had almost the same internal features. This Lucas coil stood up to similar tests more satisfactorily than the Delco Remy. We have been considerably interested in the constructional features of these Delco Remy and Lucas coils and suggest that we continue experimenting on these lines owing to the possibility of cheaper production. We always obtain when dismantling a coil, the full particulars of design and method of construction of which are carefully listed for future reference. EFC. | ||