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).
Design issues with a butterfly valve in the exhaust pipe, focusing on seizing and rattling problems.
| Identifier | WestWitteringFiles\K\June1923\ Scan69 | |
| Date | 14th June 1923 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to De. c. to BY.{R.W. Bailey - Chief Engineer} ORIGINAL. Hsl/LG14.6.23. BUTTERFLY VALVE IN EXHAUST PIPE. Y3436 As it appears probable that we shall frequently use this fitting, we suggest that we should endeavour to improve the design. The troubles we have at present are - if the spindle in the valve is a good fit, it will seize - if it is made sufficiently slack to ensure that there is no risk of seizure, the valve will cause a rattle. This is especially noticeable at light throttle conditions because of the intermittent pressures in the exhaust pipe and the fact that the valve then is shut. At present we rely on the spring which pulls the spindle in one direction to prevent the rattles. We have also had cases on production chassis of the butterfly valve in the carburetter seizing in its bearings. This has occurred after the car has been run 100 miles or more. Different materials for the bearing surfaces are being tried to overcome this. Hs.{Lord Ernest Hives - Chair} | ||