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).
Test report on carburetter taper packing and its effect on engine performance on gradients.
| Identifier | ExFiles\Box 151\3\ scan0350 | |
| Date | 21th December 1937 | |
| -2- 21st. December 1937. We have carried out tests with a taper packing fitted, giving the carburetter a forward bias of 3½° allowing for 1½° backward lean at present standard, this means a total taper of 5° forward lean. With this taper packing fitted we make it possible to start and run the engine in the tick-over position on a gradient of 1 in 8.2 with an under bonnet temperature of 84°C. With a normal bonnet temperature of 66°C it is possible to start in similar conditions to the above on a gradient of 1 in 7.3, and only a little more hand throttle opening permits an easy start on 1 in 5. During these tests two systems were tested, one with the pipe line and filter in the Vee, and one direct to the carburetter cutting out the filter in the Vee, but no appreciable difference could be detected and the results were the same. With carburetter tilted forward it was also found that starting and idling on a downhill gradient of 1 in 5 was very good and no detrimental effects were experienced at any time during our tests. * RM {William Robotham - Chief Engineer} /FD. {Frank Dodd - Bodies} | ||