Wa. Woods et Pg. Brown, FLOW AREA OF MULTIPLE POPPET VALVES, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNALOF AUTOMOBILE ENGINEERING, 210(4), 1996, pp. 347-351
The importance of valve flow area is highlighted and the advantages of
the four valve cylinder head mentioned. A simple method of making a p
reliminary assessment of multi-valve schemes, based upon relative effe
ctive flow areas, is outlined. The method is demonstrated with referen
ce to eight and less valves for odd and even numbers. The 37 per cent
increase in valve area for the four valve case is demonstrated and the
promising possibilities for the three, five and seven valve heads are
presented.