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).
Discussion concerning issues with a sliding exhaust joint and proposed solutions including a new sleeve.
| Identifier | ExFiles\Box 5a\2\ 02-page248 | |
| Date | 26th March 1930 guessed | |
| -2- Re. The Sliding Exhaust Joint. We are very concerned about this because it is at present being made for production. We send you scheme 1241 which is what we presume you have now fitted to the car. The link shewn in the scheme was put there to prevent the exhaust pipe moving forward and so ensure that the down pipe could only move into the silencer and cannot move out, as shewn in your drawing attached. If the pipe is coming out of the silencer in the way you shew we can only presume that the silencer is being pushed back. We think, if this is the case, the fault of the scheme is that the exhaust pipe has now been held in fore and aft direction while the silencer has been neglected, and that this wants the same treatment. We suggest that you might get a link made with a boss welded on the silencer to try out the suggestion. We feel that fundamentally sliding joints are likely to be unsuccessful because the inner pipe always expands more than the sleeve in which it slides, and in consequence unless there are exhaust blows when cold, the joint is bound to tighten up when it is not. We are, therefore, getting you a sleeve made in aluminium bronze which, by its greater co-efficient of expansion should improve the job and give the sliding joint a chance of working. We will send this out as soon as possible. In the meantime we have wired you as follows - EXHAUST SLIDING JOINT SIEZURE. SUGGEST YOU GET SLEEVE ON SILENCER FRNT AND MADE IN PHOSPHOR BRONZE AND TEST OUT. ALSO STAY SILENCER TO PREVENT FORE AND AFT MOVEMENT. RL. | ||