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).
'SS' engine mounting tests and a modification to the body mounting to reduce front end dither.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan044 | |
| Date | 21th January 1929 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to BJ. Sg.{Arthur F. Sidgreaves - MD} c. to Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG21.1.29. ORIGINAL 'SS{S. Smith}' ENGINE MOUNTING. X7005 X7230 Further tests have confirmed all our previous results on the SS.{S. Smith} car. Though we now have the Phantom front expansion chamber and the Phantom rear silencer fitted to 20-EX we still have a number of exhaust periods to deal with. As we improve the exhaust system, however, the apparent engine smoothness increases, and we feel that the amount of flexibility required from the engine feet in their final form will not be great. Our tests also shew that every bit of torsional rigidity that we can get from these feet appears to reduce the radiator movement. Working on the fact that all three chassis we have tested were immune from this trouble until the bodies were fitted, we ran a member across the subframe and single point mounted the front of the body on a plain bearing directly over the rear gearbox support. In effect we then had a three point body mounting, the single point being in front. We left the semi isolation scheme between the dash and scuttle. The result of this modification was a definite reduction in the remaining 10% front end dither. We should say that with this mounting only 5% of the original 100% movement is left. It was interesting to note, however, that though sitting in the body one could not detect when cornering that it was moving in relation to the frame, the controlability of contd :- | ||