If you look at the STA numbers of an Aprilia cylinder it appears that the transfers are way ahead of the Exhaust as far as power making capability.
But if you look at the reality of the Exhaust Cd, with its huge radius on the top edge, that effectively begins to open above 200* duration with the port
roof itself down at 196* then it becomes clear that all the work done by hand in the R&D dept to match the Blowdown flow numbers with the transfers
gave a highly synergistic scenario.
Raising the transfers lost power - as did lowering them.
And the scavenging pattern along with the timings had been optimized quite early on.
The same with the Aux ports - any higher or wider lost power.
All dimensions being tested on the dyno and the best results kept in production - a slow to achieve, but highly accurate method for gaining GP winning power.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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