Bare with me guys, i am trying to understand pros, cons and limiting factors between different Engine types and ways to tackle Intake/Exhaust valves/ports.
I have a keen interest in Rotary engines, and i find myself in deep though around the efficiency of the NA engine.
Long story short:
Does variable valve timing and variable valve lift create, by way of gas flow, a variable tract in which the gasses can flow?
At different RPMs and engine loads i could imagine the need for different 3 dimensional intake and exhaust profiles?
In a rotary the valves are simply ports, much the same as any ported engine, the ports remain exclusively one size and shape. Is this fact alone; proof that the rotary in the way of the Wankel, a flawed design in a varying RPM engine?
It seems logical to me that ports can only be profiled to benefit a small range of engine operations, and yes do that very well (Simple half-bridge porting a side-ported rotary yields nearly a 20% peak power increase)
The 3 dimensional effect on gas flow is not always so apparent as everything is always only considered in 2 dimensions in its design (Like a fan blade)
What genius idea would you have, to grant a rotary a variable tract/port?