Originally Posted by Hiro
this will happen with my 50mm valve head,
the inlets are so recessed I'm afraid I will lose the benefit of the bigger valve...
Hiro
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Certainly you will lose some of the benefit, but not all of it. You can compensate somewhat by increasing the valve lift but retaining the same duration. This way you'll have more lift area under the curve where it counts the most for racing....at peak airflow. Normally the peak flow is only momentary...when you hit maximum lift for a microsecond you have peak flow, but as soon as the valve starts to close again the flow drops. With higher valve lift you can his this peak flow while the valve is still opening, retain it for numerous degrees of rotation as it passes peak lift, and then retain the same peak flow until the valve has closed below the head's peak airflow numbers. So you will have more cam duration at the maximum airflow level.