SparkienSuggah

While researching porting styles and playing with the "half engine" i have in my bedroom/lab here, i came up with a new idea:

On the intake manifold: remove the aluminum wall that divides the two primary plenums, or fab a new manifold which accomplishes the same (possibly firing the secondaries into the center iron)

On the center iron, knock out the thin wall that divides the two ports until it only protrudes a little into the cavity. and of course, mildly port the center iron to increase intake duration (more forward if the secondaries feed the ceter iron)

My logic (pictures too!):
When analyzing the intake patterns through time on a 2 rotor, i figured out that there is about 60 degress of e shaft revolution where the port is closed, or 1/6th of the total revolution time. because the other rotor is 180 degress out of phase with the primary rotor, this "pause" in the intake airflow is centered in the middle of the other rotors intake cycle. in fact, this pause (on rotor 2) occurs when intake velocity (rotor 1) is at a maximum. This is all fact, to the best of my analysis

conjecture: if even length exaust headers use "scavenging" in the exaust stream to improve airflow, intake manifolds can be just the same. My porting proposal allows the air filling both rotors to travel together, resulting in smoother airflow (as opposed to short pulses) to the rotor and increasing Volumetric Efficiency.

furthermore, if the secondaries are pumping this homebrew manifold/modified center iron, the plenum length is shorter for the secondaries (used more at high revs) and longer for the prmaries(used more at low revs). This should improve low end torque by allowing air through the primaries to gather speed to fill the chamber better (air ram) and improve high end power by flowing like a ************.

even better idea: while emplying the paragraph above, port the outer (primary) irons longer on the trailing edge (retard the port closing) and port the center iron bridge style for incredibly advanced intake timing. and fill the gap between the primary and the secondary plenums (or at least make it smaller) on the manifold.

Tranquil

iTrader: (1)

That sounds amazing. My brain really hurts now, too.

I want to use the word backpressure for some reason, too.

So I guess if no one says it sucks as an idea the only thing left to do is do it and put it on a dyno.

trochoid

iTrader: (6)

It's called overlap, and depending on your port timing, you may end up with too much exhaust dilution of the intake charge.

SparkienSuggah

overlap is the duration the exaust port is open at the same time the intake port is open.
This would allow exaust dilution from rotor1 into rotor 2 Very briefly, but probably only at low engine speeds due to the gas velocities involved. With overly free flowing exaust (like many of us have now) i imagine more of the intake charge would end up in the exaust than vice versa.