Originally Posted by Shannow
Oh well, BLS...if we are going that far off topic, rotary valves offer far more open area...
Sir Harry Ricardo was testing 5 and six valve heads in 1911...Wankels have pretty big port areas also...particularly with respect to swept volume

Now we're talking laugh

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.