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).
Improving fuel distribution in induction systems by fitting a 'Reatomizer' to correct throttle and pipe issues.
| Identifier | ExFiles\Box 75\2\ scan0279 | |
| Date | 2nd February 1922 guessed | |
| Oyl - G 2222 Sheet #2. He therefore considers that we now have an almost perfect induction system and attributes it to our type of throttle with its excellent ability for vaporizing liquid gasoline coupled with the use of a comparatively smooth induction pipe. On other cars he has shown an increase of road mileage with best settings of the carburetter in each case of from three to thirty per cent, and he attributes this to the bad effect on distribution caused by - 1. a butterfly throttle, 2. a rough and irregular induction system. We still suffer from variations in the characteristics of the induction systems between individual cars, and have traced these variations in our own case to variations in the throttle. In some cases, where the water jacket protrudes into the throttle chamber, a sharp corner has been left through machining the face of the jacket (see sketch enclosed). In every case this produces bad distribution and even with vaporizers will make the dynamometer results so bad that it is necessary to delay the dynamometer test until we have rectified the old throttle, or fitted a new one. Altering the pin in the throttle will produce no appreciable effect, but fitting the Reatomizer above the throttle will correct the bad distribution to a great extent. [Handwritten note with an arrow pointing to the text about the sharp corner]: by rounding the sharp corner with a file Fitting the Reatomizer in each of the 6 induction ports in order to "re-blow" the accumulated fuel, will give practically perfect results with the worst throttle we have so far tried. For example - We fitted a new car with the old plain induction pipe and a throttle which had given such bad results on the dynamometer with the vaporizer pipe that it had been definitely rejected as hopeless. The results with the bad throttle and plain pipe were that the car lacked power and constantly loaded up. Fitting one Reatomizer above the throttle greatly improved the tendency to load up and made the car satisfactory from the point of view of the average user. We, however, could still load it. Fitting in addition to the above, 6 Reatomizers in the induction ports, made it impossible to load up the car. Again, on 78-NE, the car which was tested by E.P. last summer and which failed to load up, it was found practically impossible to run the car in winter because of the bad distribution and loading. Fitting a single Reatomizer above the throttle produced practically no effect. Fitting the 6 Reatomizers in addition to the above, rectified the car from the point of view of loading up, and improved its hill-climbing and acceleration so much that the performance of the car on the road was equal to our best example of cars fitted | ||