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).
Exhaust and inlet valve design and materials for all aero and car engines.
| Identifier | ExFiles\Box 17\6\ Scan101 | |
| Date | 19th August 1929 | |
| Rg.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} ) FROM R.{Sir Henry Royce} By.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} ) X7060 R2/M19.8.29. Copy to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} F.{Mr Friese} OY. EXHAUST AND INLET VALVES ALL AERO AND CAR ENGINES. X7230 X7060 X4488 X4479 Our recent experience with R.{Sir Henry Royce} engines should be taken advantage of at once as follows : All exhausts should be stopped, and those going through used for inlets as far as possible. The design of both the exhaust valves and guides does not seem the best possible, (which is now being tried out in several modifications). Also the material K.E.9. appears distinctly superior to Silchrome for exhaust valves. At the same time since we now have a different size and shape for the inlet, we can use for this valve any steel which is found most suitable. At the moment the present tulip design, and silchrome, is no doubt better than the shape and material we are adopting for exhaust, because of the easier air flow, and also the facility of hardening the valve end, and the wearing effect on the guide and valve face. I do not think we know what is best for the valve guide, and I believe it may be found different for the exhaust and inlet, and also different for the cars and aero engines. Derby should concentrate on this subject, and quickly get a result for the present production. The cars need a cooler exhaust valve, and greater safety from losing clearance under very severe conditions. | ||