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).
Outlining proposed modifications and improvements for the 3½ Litre Bentley second series.
| Identifier | ExFiles\Box 3\4\ 04-page399 | |
| Date | 13th July 1933 | |
| To AG. From Es. c. to For. c. to E.{Mr Elliott - Chief Engineer} c. to Ds. c. to By.{R.W. Bailey - Chief Engineer} c. to V.{VIENNA} c. to Ha. Re. 3½ Litre Bentley. Now that we have completed our model production car for 10,000 miles test we wish to consider modifications and improvements for the second series. It will be realised that once we have established a standard Bentley production, on the next car we can test out experimental features and as a result of the test decide whether we wish to adopt them. The following are the modifications we propose to fit :- (1) Connecting rods with drilled hole for oil instead of oil pipe. Drilling the rods is now the accepted method of getting oil to the gudgeon pin. We have had a lot of trouble with the oil pipes. The 25 HP. car which recently finished a run in France had several broken. We want to get rid of these pipes on all our engines as soon as possible. (2) Crankshaft 4" larger on the journals. This will put up our critical speed approximately 150 R.P.M. and will provide an extra safeguard on any damage to the crankshaft. (3) Oil Cooler. Although this is not an urgent matter on the Bentley there is a definite advantage in having the form of oil cooler which warms the oil up quickly as well as preventing it getting too high a temperature. We look forward that this may be a standard fitting on all of our cars at no distant date. (4) Propeller Shaft. Our present propeller shaft was copied from the American mechanic's joint about ten years ago. Since that date considerable progress has been made and we wish to test one of the modern American propeller shafts fitted with needle bearings. One advantage which we hope to gain is | ||