Keep in mind that the periphery port engine does not act exactly like the side port engine. The side port engine closes off the end of the runner in a crisp sharp action similar to an intake valve in a piston engine with a high lift short duration cam. The flow in the runner at the port opening stops cold, so from 350 to 400 MPH to zero. The period of low flow as a poppet valve lifts off its seat, or while it closes is missing.

 

And still you will have a few RPM bands where the column of air compressing behind the side of the rotor

will be liberated and allowed to flow into the chamber before the stored energy of compression is lost. This can be seen in graphs, and is the point where VE exceeds 100%, In other words the engine at that RPM can injest more cubic inches of volume than its actual displacement. This ability may show up in two or more RPM bands, but is generally at lower RPM. Gaining performance from this has been done by Mazda with the valved pipe organ plastic intake manifold. Used to pump up the rotaries lacking low speed torque, most needed in a street car.

So, almost direct comparisons with piston engine induction systems are valid.

 

The Periphery ported engine (Intake and exhaust) is no less complex, but very different. The reflected wave from a closed end column is missing. The intake is instead connected across the rotor face to the

exhaust pipe which is doing a dance of its own. The output of the exhaust is being damped by a muffler of some sort, so there is a muddle of upset reflected waves, and probably some high pressure trying to get back into the intake flow. 

 

The periphery port operates very close to 100% cyilinder filling (percent of total chamber volume filled per event) all of the time. It will continue to increase in HP as the RPM increases up to its mechanical limit.

 

It breaths real good. You would have to work hard to prevent it from making 190 to 200 HP at 6,500 RPM.

If it can get enough air and fuel. The exhaust is more important than on a side port. Thought should be expended on collecting the header pipes before muffling.

 

Early model air plane engines were throttled by a rotating valve that closed of the exhaust port. The engine could be throttled right down to idle by just restricting the exhaust. Even though the throttle was still in the wide open position.

 

See Mistral crash.

 

The Periphery ported Renesis is a different engine. A turbocharged rotary is a different class of engines.

 

We are just getting started.

 

The picture is one of my bridgeported irons.

 

Lynn E. Hanover