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).
Carburettor and throttle design modifications based on experiments.
| Identifier | WestWitteringFiles\G\June1921\ Scan15 | |
| Date | 1st June 1921 | |
| To R.R. of America Inc. -9- R10/G8/6/21 Contd. from R.{Sir Henry Royce} is also at the highest temperature possible. We are now proposing, as a result of Mr. Hives' experi- ments, that the hot water to this jacket shall be replaced by hot air from the exhaust. It is with this that Mr. Hives has found the most advantageous improvement, and the only reliable result that has been found. If sufficient heat is applied to the throttle, then the contour of the induction pipe is of very much less importance. We are at present engaged in a design in which we are moving the carburettor higher up, and facing horizontally over the top of the cylinders, by giving it quarter of a turn, so that the floatchamber is on the radiator side of the carburettor. Throttle. With this arrangement we abandon the use of the piston valve and use instead a butterfly valve. This is much the same as we have arranged on the new small 20 H.P. model. Immediately after the butterfly throttle valve an exhaust heated jacket is used and continued nearly right across the top of the cylinders. We send you a sketch of this arrangement, which we hope will be tested in Derby in the course of the next few days. Should it prove superior to the present, of which we think there is little doubt, we believe this modification is the one you would like to adopt for cars about to be manufactured, and if it shows marked improvement on that in which the design of present type of throttle is heated by exhaust gas, then we should suppose that it might be worth while to make this more extensive alteration on existing cars. RE WEAR. X1583 X544 With regard to the question of wear, my memo of October last year (RB{R. Bowen}/G5/10/20) on lubricating oils, recommended that | ||