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Originally Posted by DavidVizard-GFN
Well so much for what it ‘was not’ that made the wide torque band a reality. The real world factors were about as follows... Ports the appropriate size (very important).
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What guides your decision in the port size for a particular engine and use? Displacement per cylinder? Peak torque rpm? Peak power rpm? Internal geometry and cam specs?
I see a trend today towards ports that are larger than what I would consider optimum for many street/strip cars and bikes chasing port flow and peak power numbers at the expense of velocity and a well shaped torque band with good area under the curve.
What are your guidelines on this?