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).
Diagnosing and remedying explosions in the silencer caused by incorrect throttle and governor control adjustments.
Identifier | ExFiles\Box 38\4\ Scan095 | |
Date | 7th October 1926 guessed | |
contd :- -2- It is very important that all controls be adjusted to ensure that the throttle closes when the governor lever is at the bottom of the quadrant. In previous reports we have emphasised very strongly the necessity for this as being the most vital factor influencing explosions. The Works take particular care to ensure that the best possible conditions are given by the controls, consequently they should and do need no alteration or adjustment in service. The only car that has been brought to our notice by Sales as being a bad example of this fault, was found, by our tester, to be in a condition which we have emphasised as being excellent for producing explosions in the silencer. Our tester found the throttle on this car (103-MC) did not fully close at all, owing to the governor spring tension having been increased, the result being that the throttle cam roller could never leave the cam and the throttle in consequence never closed. Also it was found that the governor control rod worked very stiffly in its bearings, this was remedied by the use of oil. We cannot emphasize too strongly the necessity for keeping these controls working absolutely freely. After correcting these faults our tester reports that explosions were very slight, being very greatly reduced as compared with previously. After fitting a positive throttle control to this car our tester reported that explosions were equally as bad as in the first instance when running with the throttle lever in a slow running position. When controlled by the governor, the throttle is definitely closed except at speeds from 3 to 5 MPH. above the speed at which the governor... | ||