I get a lot of suggestions on the best way to do a P-port but nobody sends me scale drawings. The rotor housing is 3 inches wide and so far I was able to get a 1 7/8 inside diameter p-port in there. That leaves only a half inch on either side of a 2 inch OD tube. I have been at this for a few years and tried several other ideas so far.
I tried the traditional bonding in approach without initial success. The learning curve proved rather steep having to do it over after pin hole leaks developed.

The welded p-port idea was designed to make the system reliable as far as the inner joint was concerned and repairable as far as the outer joint is concerned. The seal plate is bolted on and if it leaks a new gasket or O-ring can be installed by merely unbolting the seal plate. No need to take the whole engine apart. It was also designed so anybody could do it with nothing more than a simple milling machine or large drill press.

It is not as easy as it looks to design something with that inside diameter with inner and outer O-ring seals. If you think you have a better idea send me a scale drawing or pictures and prove me wrong.

BTW straight in is better than coming out at an angle for several reasons. It is aerodynamically  better as that is the direction the air wants to go and that is how Mazda did it on the Le Mans engine. A more subtle advantage is the 180 degree, off the shelf, tubing bends can simple be rotated 45 degrees to lower the over all height of the engine. That is not quite so simple if you come out of the housing at an angle.

Paul Lamar

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