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).
Dash semi-isolation scheme to reduce noise and movement between the dash and scuttle frame.
| Identifier | ExFiles\Box 41\3\ Scan444 | |
| Date | 15th December 1924 | |
| R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. -3- EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/TMW/LG15.12.24. rapidly. the same deflection at the front takes place. We therefore tried out the dash semi-isolation scheme shown on F.53245 consisting of 4 specially designed bolts having rubber rings inserted between the dash and scuttle frame. These were not successful in preventing the movement, only slightly damping it, and as they were constantly working about, quickly shewed signs of wear in the cups, setting up bad squeaks and creaks. We however developed the scheme, and recommend the following method of overcoming the trouble :- Instruct the Coachbuilders to insert rubber rings and bolts between the Dash Supports and their Scuttle Frame, in a similar manner to that shown on the aforementioned scheme; the scuttle covering hiding the bolts from the outside. Another bolt and rubber ring between the scuttle frame and top centre of dash would be all that is necessary. This reduces the movement to an unnoticeable minimum and does not create any additional noise in the body, and as a safeguard against creaks we suggest that they be instructed to assemble the bolts and rings with thick grease on all the surfaces. We are running the car about fitted up like this, so far without any adverse development. Hs{Lord Ernest Hives - Chair}/TMW. | ||