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).
Difficulty in timing Bentley engines and a proposed solution.
| Identifier | ExFiles\Box 3\4\ 04-page371 | |
| Date | 1st July 1933 | |
| To BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} c.c. to Eft. c.c. to S. c.c. to Mx.{John H Maddocks - Chief Proving Officer} c.c. to HIC. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}3/KT.1. 7.33. TIMING OF THE BENTLEY ENGINES. We have run into a difficulty in timing the Bentley engines. Now that we have put the damping of the slipper wheel up, it is possible, in a new engine, for the slipper wheel to stay over on its stops because the damping is sufficient to stop the driving springs from centralising. When this occurs it is possible for anybody to check the timing on the test bed and get a reading which is equivalent to one tooth wrong. To avoid such an occurence, we suggest that when the engine is timed in the first place by the fitters, the rear half only of the slipper wheel is fitted and two of the driving springs be replaced by distance pieces. Alternatively, a fitting could be made to temporarily lock the spring drive. With the spring drive thus locked, T.D.C. could then me marked on both the fan pulley and the timing case, which would indicate the central position of the spring drive. This could always be referred to when checking engines on either the test bed or on the car. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||