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).
Engine vibrations in the Phantom II and 20-HP models.
| Identifier | ExFiles\Box 137\4\ scan0082 | |
| Date | 20th March 1930 | |
| X634. Hs.{Lord Ernest Hives - Chair} e.{Mr Elliott - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} Rg.{Mr Rowledge} DA.{Bernard Day - Chassis Design} Wor.{Arthur Wormald - General Works Manager} Sg.{Arthur F. Sidgreaves - MD} EP{G. Eric Platford - Chief Quality Engineer}4/H20.3.30. 20HP. re. PHANTOM II., ENGINE VIBRATIONS. In spite of various improvements we have recently made in regard to the engine and chassis, we still consider that the engine vibrations, "fuss and roar" generally especially at higher engine speeds cannot be considered satisfactory. This feature is particularly noticeable when testing complete finished cars before passing for delivery to customers. One still experiences disagreeable periods and booms i.e. "fuss and roar". Although every attention is being given to make sure that the chassis so far as engine mounting, slipper drive, exhaust system is concerned is in the best possible condition, and booming conditions are as far as possible being attended to, we cannot consider that the chassis in this respect is the best that can be obtained. We are certainly expecting that we shall have a big "scream" from customers about it, although, as far as we can find out, except for one or two cases which we have handled in regard to our own cars or Agents Trials cars, it has not been a serious complaint from customers. We bring this forward, as in view of the demonstration which was made to us sometime ago by Hs.{Lord Ernest Hives - Chair} on a certain Experimental car ( I believe 22-EX) which was certainly very good in this respect, no move appears to have been made for these improvements to be standardised. We suggest that the job is of sufficient importance for such improvements to be embodied on the car which is now about to do the 10,000 miles test. There is also the torque reaction period vibration at 20 mph. which is still considered a poor feature and which was again demonstrated to you today on a production chassis, and for which you agreed there was no further possible cure at present. Fortunately when the chassis is fitted with complete finished body, the acute period of this torque reaction does not seem so bad, but it is still a general vibration and requires urgent attention. The retard vibration and boom periods on the 20-HP. car, although considered reasonable during our chassis tests certainly show up very badly on some chassis when complete with their own bodies fitted. The chief offender in this CONTD:- Handwritten notes: X7770 X5770. X634. X7005 X5005 | ||