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).
Valve mechanism design, performance, and testing methods.
| Identifier | ExFiles\Box 173\2\ img297 | |
| Date | 12th March 1934 guessed | |
| when the valve is closing. They attribute some of this to loss of effective camshaft toe due to deflection in the valve mechanism. ⑤ They use a constant velocity toe having a vel of ½ Thou per camshaft degree. The length of toe necessary depends on the amount of deflection in the valve gear but is usually between .018, .015. If the valve gear is very rigid it can be less. ⑥ If we have further trouble with the eccentric pulley housing fresh they suggest needle bearings here. ⑦ They make the seat for the poppet-valve in the oil reservoir by lapping a ball onto the knife edge. ⑧ They have obtained valve lift-curves at speed by means of a mirror fitted to the valve stem. These curves are about 1 foot high. They shew working deflection of the valve gear, incipient bounce etc and have been of great assistance in improving the valve gear. I have samples demonstrating this. | ||