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).
Letter from Rudge-Whitworth to Rolls-Royce with technical suggestions for valve lift and head-to-stem radius.
| Identifier | ExFiles\Box 133\1\ scan0046 | |
| Date | 8th May 1936 guessed | |
| Continued Letter to Messrs. Rolls-Royce Ltd, Derby. Rudge-Whitworth, Ltd. Sheet No. 2. on the maximum economy end of the range, which will put the exhaust valve temperatures up considerably. It is sometimes found that due to wear of the rockers the leverage gets somewhat increased. You might check the lift of the valves which should be .32". If more than this you might, with advantage, reduce it, and, in fact, we believe that .3" lift gives no loss in power, and it would, of course, reduce the striking velocity of the valve on the seat. Finally, it might be worth trying a radius of .5" joining the head to stem, assuming that your present failures occur on the stem. This will give rather more flexibility of the head. Your other letter of the 8th. instant will be dealt with in the course of a few days. Yours faithfully, For RUDGE-WHITWORTH LIMITED. g.{Mr Griffiths - Chief Accountant / Mr Gnapp} L. Hack Chief of Tech. Dept. Dict.d but not signed by Mr. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} L. Hack. | ||