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).
Vehicle vibration, comparing pre-war and post-war cars, and investigating causes like fan and dynamo belts.
| Identifier | ExFiles\Box 25\3\ Scan080 | |
| Date | 19th July 1922 guessed | |
| contd:- -4- pre-war cars than we have had on the post-war cars. To look upon vibration as a post-war complaint is absolutely wrong. We have been reducing and raising the compressions on the engine alternately ever since the first 40/50 chassis. If we take our record of post-war cars - 1920 - lowering compression (standing order) 1921 - raising " " 1922 - lowering " " " Since returning from London we have tried a number of pre-war cars and compared them with a number of post-war cars. We agree that in most cases one can tell the difference. The difference is shown up by the virtues of the postwar car compared with the pre-war car. We consider it is up to the Sales Dept. to produce a pre-war or post-war car which has the features they desire at the present time. Memories of the pre-war cars are very misleading. We do not expect, when we lower the compression that we are going to satisfy Sales Dept. as regards vibration. The cars will be better on the average but we consider, using the same compression for open and closed cars, it is only reasonable to expect that we shall have complaints with the closed cars. Whilst in London we examined two other new 40/50 cars in which Mr. Evans complained of vibrations and noise. We found that on both cars the fan belt was causing a distinct vibration and Mr. Evans agreed in one case the car was satisfactory when this fault was overcome. On the second car, besides the fan belt vibration, there was a bad vibration from the dynamo belt. This was a chassis which had been off test for a long time and had got one of the condemned type of dynamo belts fitted. In the case contd:- | ||