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).
Letter discussing a broken exhaust manifold and choke valve issues on chassis 63-EF, proposing an experimental solution.
| Identifier | ExFiles\Box 66\2\ scan0346 | |
| Date | 30th December 1931 | |
| X8230. P I Exhaust System (Customers Complaints) W/S-C. c to Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} Hd{Mr Hayward/Mr Huddy}/SB{Mr Bull/Mr Bannister}8/MW30.12.31. X8230. X4117. Re CHASSIS NO. 63-EF - Fraser Lawton Esq. We are in receipt of your C4/C29.12.31. enclosing a copy of Rv2/L18.12.31, having further reference to the broken exhaust manifold on the above car. We certainly agree with Rv that the choke valve in the rear exhaust down pipe does offer an appreciable resistance to the flow of exhaust gasses, and we ourselves have had several instances of this being aggravated by certain drivers having disconnected the choke valve and propped it permanently open, or rather in a position which they thought was fully open but which is actually well past the centre line of the pipe and actually results in the valve partially closing the passage. This, therefore, is a point which should certainly be checked, and we gather from the copy of Rv's letter to Mr. Guinart that this will be attended to. Unfortunately we cannot dispense with the choke valve altogether without interfering with the heating of the carburetter throttle, and furthermore we do not think that this would effect a complete solution of the trouble because in any case the rear exhaust manifold will invariably be much hotter than the front one owing to the closer proximity of the fan to the latter. In connection with this question of the choke valve, we gather from Rv's remarks that he is unaware of the later design of choke valve and spindle which dispenses altogether with lubrication, namely the Nitralloy Spindle with cast iron bushes. We consider that this ought to be fitted as there is much less chance of the cutout valve sticking, and there is less temptation for the valve to be put out of commission. We have discussed the whole question with the Experimental Department, and they would like us to try an experimental manifold on this particular car because it presents a convenient opportunity of running the pipe under much more adverse conditions than can be realized in this Country. This manifold is made in two halves and has a sliding joint to connect the two halves together. We shall be glad to know whether you agree to this procedure, and if so we will arrange to send the necessary material to Rv. as soon as possible. CONT'D.{John DeLooze - Company Secretary} | ||