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).
Further tests comparing exhaust and water-heated induction pipes for the Phantom engine.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan008 | |
| Date | 6th June 1923 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c.c. to B.J.V Wor.{Arthur Wormald - General Works Manager} c.c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c.c. to BY.{R.W. Bailey - Chief Engineer} ORIGINAL Hs{Lord Ernest Hives - Chair}/ACLL/LG9. 6. 23. PHANTOM INDUCTION PIPE HEATING. X8070 X7070 We have made further tests with the exhaust and water heated induction pipes on the Phantom and repeated our previous comparison of these two systems because we were not satisfied that the previous results represented a true comparison. It was found during subsequent tests that the temperature results with the exhaust heated hot spot proved to be very erratic even when using the same hot spot and thermometer positions for each test. With exhaust gas the thermometer position on the hot spot proved to be a very important point as there was a considerable difference in temp. at various points much more so than when water heating was used. Considering all these points we were led to use a different method of taking the comparisons in order to obtain consistent results. The method adopted was to fit up a separate hot spot at the side of the one on the engine and couple this up with the exhaust or water instead of the one with the carb. attached. The induction passage in this hot spot was filled with oil and the temp. rise of the oil recorded. In this way we make use of the whole heating surface of the hot spot and get a better comparison of the rate heat would be added to the mixture under conditions of exhaust or water heating and thereby avoid errors due to the position of the contd:- | ||