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).
Causes of valve bounce, particularly the effect of air pressure versus elasticity and friction.
| Identifier | ExFiles\Box 43\3\ Scan099 | |
| Date | 22th December 1926 | |
| To RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to BJ. Wor.{Arthur Wormald - General Works Manager} X4003 R2/M22.12.26. VALVE BOUNCE. X.3822 X.4003 If you run a valve on rig with weak springs fast enough to leave the cam, how does it behave without air? Is it not usual for a falling body such as this, and a contact rocker on a magneto, to always bounce, due to general elasticity and insufficient damping friction. One can well understand the air current causing difference of pressure and retarding the fall so that the valve etc. leaves the cam, but I can hardly believe that the air has much to do with the rebound causing it to leave its seat. R.{Sir Henry Royce} | ||