Two possible overhead valve combustion chambers are beingconsidered, the first has two valves and the second design has fourvalves per cylinder. The diameter of the inlet valve is 23 mm forthe first design and 18.5 mm for the second design. If the seconddesign is adopted, show that the total valve perimeter is increasedby 60.8 per cent. If the valve lift is restricted to the samefraction of valve diameter, calculate the increase in flow area.What are the additional benefits in using four valves percylinder?
