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).
Tests to reduce heat from exhaust boxes by lagging them with asbestos and planished steel.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan41 | |
| Date | 12th July 1923 | |
| R.R. 493A (40 H) (SL 12 12-7-23). J.H., D.{John DeLooze - Company Secretary} HOT DRIVER COMPARTMENT EXH BOX LAGGING EXPERIMENTAL REPORT. Expl. No. 3003 34/36 REF No.12/1032.2.24. DYNO & ROAD. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. EQ. c. to DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} c. to HY.{Tom Haldenby - Plant Engineer} EF. c. to WOR.{Arthur Wormald - General Works Manager} 40/50 CHASSIS. HEAT FROM EXHAUST BOXES. Whilst we were carrying out tests for reducing the heat in the scuttle, we found it was possible to make quite a good job of lagging the present exhaust boxes on the 40/50 HP. We wrapped the exhaust boxes with .25" asbestos and then covered it with a thin sheet of planished steel which was held on by means of screws screwed into the exhaust boxes. We found, on the road, that this reduced the heat - it also gave a much better appearance to the exhaust boxes. It will not, however, stand up to our dynamometer tests. At the present time when standard cars are run on the dynamometer, there is very little air passing round the exhaust, because the cars are run with the bonnet off, and owing to the continuous running full power, the exhaust box pipes etc. reach a temperature of approximately 700/750°C. The magnetos stand up under this condition. We consider, however, that when we fix the generator and magneto on the exhaust side of the engine, we should take precautions to avoid the excessive heating on the dynamometer. It is a MOCK condition that can never be obtained on the road. Hs.{Lord Ernest Hives - Chair} | ||