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).
Secret memo discussing solutions for faults related to water boiling, excess oil consumption, and steering.
| Identifier | ExFiles\Box 69\3\ scan0198 | |
| Date | 29th April 1925 | |
| To CJ. from R.{Sir Henry Royce} c. to Wor.{Arthur Wormald - General Works Manager} BJ. c. to BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} S E C R E T. Y8770 R1/M29.4.25. EAC. AND 40/50. X.8770 X.2565 For the several faults that are causing us trouble I have arranged the following :- WATER BOILING 40/50 EX. X.766 X.8230 For the hot climates, and preferably generally, I am recommending that we cancel the valve in the exhaust pipe using an induced system of circulation, or revert to the water heated throttle both for 40/50 and EAC. This, with the slightly better and much easier driven fan (not the high speed one) the louvred bonnet, and 1" larger radiator, and later with the EAC. overhead valve engine which heats less water per HP., we ought to be in a better position. We now only await Sales permission for the last 1" of height in the radiator, if less boiling is still desired at the sacrifice of more cost, weight, and less easy sight of the car front. EXCESS OIL CONSUMPTION EAC. X.8980 X.8040 So far the only thing which has shewn an improvement is the L. shaped ring, but we fear these may not be enough as we want a change from 300/400 M.P.G. to 1200/1500 M.P.G., so we have in hand at Derby (designs for which have been sent this week). (1) Cutting the cyl. trunks to drip the oil to the extreme sides. (2) Some simple splashers that may prevent the spray getting into the cyls. and also reduce the amount of spray. (3) Some changes to the pistons giving 3 or 4 possible advantages, including some slight improvements in engine efficiency, and general coolness of water and oil, but mainly to reduce the quantity of oil that passes the piston. Rings are raised to give more surface above the piston pin against wear and knocks hoping it will keep the oil down. Lower compression has allowed us to have a hollow shaped head to the piston. We are trying also a scraper ring in the skirt in spite of the split piston, an unsplit piston, and a stiffer bottom to the split piston. Some of these should shew an improvement. STEERING 40/50 BUT PRINCIPALLY EAC. X.8430. Both 40/50 and EAC. boxes require careful fitting contd :- | ||