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).
Technical report on tests to reduce explosions in the exhaust system using wire gauze and considering the effect of the governor.
| Identifier | ExFiles\Box 1\3\ B001_X 93-page63 | |
| Date | 23th August 1926 | |
| Contd. -4- Hs{Lord Ernest Hives - Chair}/ACL1/T23.8.26. Wire gauze over exhaust port:- Copper gauze screens over the exhaust ports, although not entirely preventing the trouble certainly reduce the tendency, but as they very quickly became damaged it was difficult to estimate their true value. Wire gauze in the connecting pipe between the front and rear silencer. Six discs of 20 mesh gauze wire were placed in the connecting pipe between the front and rear silencers and although this arrangement was not expected to influence explosions taking place in the front portion of the exhaust system, it was desired to see if it would reduce the more severe ones taking place in the rear silencer. The test shewed that it had no appreciable effect either when running with the cutout open or closed. Effect of governorl We know that for any particular motoring speed there is a certain position of the throttle which will give the most trouble from explosions in the silencer. Positions above this optimum value reduce the trouble until the engine again fires regularly also below this until the charge is too weak to build up and cause explosions. It would therefore seem that a sensitive governor which would well close the throttle when the car over-runs the engine would, although perhaps not be a cure, go a long way to ease the trouble in its more severe form. If this were so we should still expect the trouble to occur on Contd. | ||