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).
Report page detailing temperature tests on various engine coil configurations, including insulated and uninsulated setups.
| Identifier | WestWitteringFiles\J\December1922\ Scan84 | |
| Date | 14th December 1922 | |
| Contd. -2- EFC2/T14.12.22. Please find attached photostat copy of temperature/time curves obtained in this connection for:- (1) A coil in stabalite case mounted on the engine without insulation. (2) A previous standard Goshawk coil in bakelite case moulted on the engine without insulation. (3) As (2) but with insulation. (4) Coil as in (2) but mounted on bracket and uninsulated. (5) As (4) but insulated. In case (2) the temperature rose so much that it was impossible to keep the engine running so as to obtain the maximum temperature. In the other cases the engine could be kept going until the maximum temperature was attained although though in case (3) it was necessary both to advance the ignition and strengthen the mixture to prevent failure. It will be seen from the curves that the actual highest temperatures attained are as follows :- Uninsulated bakelite coil on bracket. 77.5°C Stabalite coil on engine 77°C Insulated bakelite coil on engine 75°C Insulated bakelite coil on bracket 73°C thus showing the relative value at the insulation and the bracket position. We reported in our last report EFC5/T1.12.22 that the previous standard Goshawk coil in the wheelcase position had given results about equal to the best improved coil in bakelite case in the engine position, both uninsulated. These equal results are not, however, considered to be quite so good as that of the 40/50 stabalite coil in the engine | ||