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).
Fitting an aluminium induction system, water heating, and improved tappet lubrication to a 7-EX car chassis.
| Identifier | ExFiles\Box 72\2\ scan0108 | |
| Date | 7th July 1925 | |
| R.R. 493A (50n) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. x8992 REF:HS{Lord Ernest Hives - Chair}4/LGC. 7. 25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to RQ. E.{Mr Elliott - Chief Engineer} c. to OA. BY.{R.W. Bailey - Chief Engineer} c. to WOr.{Arthur Wormald - General Works Manager} 7-EX CAR. EAC. CHASSIS FOR R.{Sir Henry Royce} The following new parts were fitted to this chassis when it went to WW. this weekend (4th. and 5th. July). These parts will be on when it is sent to London tomorrow for Sales to inspect. Aluminium induction pipe, induction bend and carburetter in place of cast iron and bronze. The saving in weight when using aluminium for these parts is approximately 20 lbs. The induction pipe is .25" smaller in diameter than the present standard. There is however no loss in power. We do not claim that there is any advantage with this induction pipe except reduction in bulk and weight. Water heating is used in induction bend in place of exhaust heating. This enables us to do away with the troublesome choke valve in the exhaust pipe. With the limited experience we have had so far with water heating, it would appear that when the engine reaches its normal temperature there is no noticeable difference compared with the exhaust heated bend. The warming up process however takes much longer. Tappets with improved scheme of lubrication to Sch.634. This scheme allows for the oil to drain into the pins which carry the rollers. There have been cases of very rapid wear on 20 HP. cars which can only be attributed to lack of lubrication. | ||