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).
The operation and advantages of an intermediate valve design for internal combustion engines.
| Identifier | ExFiles\Box 15\6\ Scan071 | |
| Date | 8th December 1927 | |
| - 2 - being that the intermediate valve or valves shall shut off the valves proper during a portion of the cycle as set out above. By this means the intermediate valve, though heated by the out-going hot gases during the exhaust stroke, is immediately cooled down again by the incoming fuel-laden inlet gases on the induction stroke, thus effectually preventing detonation caused by un-burnt gases being compressed to their self-ignition temperature against the head of the heated exhaust valve proper. In cases where the initial valves or valves proper are opposed, the incoming charge impinges upon the hot exhaust valve head, as well as the intermediate valve head, not only cooling both but ensuring better vaporisation of the wet incoming mixtures with resultant economies in fuel consumption. Other advantages claimed are increased turbulence of incoming mixture and the probability of increasing volumetric efficiency by the possible reduction of hot spot temperatures, also the possibility of increasing valve areas and improving the shape of the combustion chamber proper from a combustion point of view. This patent is equally applicable to Aero engines, Stationary engines, Marine engines and Motor Car engines, also Deisel or Semi-Deisel, whether using high or low grade fuels, and may be used in conjunction with a Ricardo or modified Rickardo type head if desired. December 8, 1927. | ||