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).
Comparative analysis and diagrammatic breakdown of SS and Chrysler engine mounting systems.
| Identifier | WestWitteringFiles\T\January1929-February1929\ Scan010 | |
| Date | 7th January 1929 | |
| X. FROM E.{Mr Elliott - Chief Engineer} C. to BO. WOR.{Arthur Wormald - General Works Manager} HS.{Lord Ernest Hives - Chair} SECRET ORIGINAL re. ENGINE MOUNTING. X4012 The SS.{S. Smith} chassis fitted with all rubber engine suspension achieves a remarkable degree of smoothness over its full range of speed under all conditions of throttle opening and over-run. The Chrysler car we have tried in Derby gives quite a meritorious performance somewhat intermediate between the SS.{S. Smith} all rubber, and the SS.{S. Smith} with solid front mounting as regards smoothness, and the front end of the chassis appears to be quite steady up to 60 MPH. The Chrysler has low gross weight and low axle gear in its favour. The engine is 4 point mounted and thin rubber is used at each point of attachment. The rear end of the engine is rigidly bolted to two brackets which in turn are bolted in the chassis frame on a lining of rubber about .250" thick. The scheme is crude but assuming a certain degree of freedom in the bolting the bracket can flex by parallelogramming the length of rubber 'X'. The rubber 'Y' does not appear to be set up. The front end of the engine is carried by the wheelcase, this latter having feet resting on rubber washers about .250" thick on a cross member in the frame. Similar rubber washers are also used under the bottom ends of the clamping bolts securing these front feet. There is nothing remarkable about this scheme but it must be admitted that the results obtained are good. It is possibly not the whole story where the question of front end steadiness is concerned. (1) | ||