I'm working on a Pport Renesis. It works out being fairly mild port timing. The key is that the side exhaust closes much sooner, therefore the overlap is much less than even the old 6 port motor and the intake closes WAY sooner than the new Renesis six port. Essentially I am moving the intake down somewhat and creating a little bit of overlap. I don't think that zero overlap is a good thing for anybody except CARB and the EPA. The other nice thing is that the exhaust opens much later and more gradually, so there is more expansion, and a lower EGT. Things that tend to be kinder to the muffler etc. The port timing is somewhere between the Mazda factory Pport and an old four port motor with the "lobe center" retarded a bit to borrow from the piston world.

I'm not going for radical port size. Just 44mm. There is also the question of how well the Renesis apex seals will do with a peripheral port. At least it is an intake and not getting blasted with hot exhaust gas, but there is still the question.....

My reason for doing the Pport have more to do with my airframe, and some other problems specific to my installation. I am not sure it is worth the effort otherwise.

As to BSFC....who knows. I hope to find out soon.

Monty