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).
Gear changing procedures, transmission clicking, and potential improvements.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan009 | |
| Date | 3rd March 1931 guessed | |
| (2) There is no spring in the control of course. To engage the dogs from an engine speed too slow the clutch has to be in and even at full throttle they do not jump provided the lever is pulled with rather more firmness than is ordinarily used. When an attempt is made to engage them with the engine much too fast they jump unless the change lever is vigorously handled. GEAR CHANGING. Apart from accidental gear crashing which we will assume can be remedied somehow we think that it will be possible to make good gear changes at all car and engine speeds, and we suggest the following as the simplest and most certain procedure: 3rd. to top. Clutch well out picking up clutch stop. Lever moved straight across. Clutch in when dogs are home. Top to 3rd. Clutch out momentarily to disengage dogs and simultaneously lever moved straight across. Accelerator released during the above but at high speed need not be released. 2nd. to 3rd. Clutch well out and lever moved into neutral long enough to slow down well below synchronous speed. Lever into 3rd. Clutch in and accelerator down. At low speeds can be like 3rd. to top. Two to three is the only change that needs any judgment and even then waiting too long can do no harm, and the jar from insufficient delay is very mild. CLICKING. The small angle of 2 or 3° is quite sufficient on the Riley to keep the dogs apart. Clicking is much less pronounced than on 14-EX. but might be objectionable with a spring loaded control. INCREASED NUMBER OF TEETH. Our remarks about increased number of teeth were only made in connection with the reduction of the slight transmission jerk when 3rd. speed dogs engage. Other considerations may limit the number however. DA{Bernard Day - Chassis Design}/HDY.{William Hardy} Hdy{William Hardy} | ||