You tend to forget some very important points Rusty, please remember I'm working on aluminium end/side housings ( without ports) - so too is Richard Sohn. It is much easier and cheaper to do it that way. So naturally we need a port somewhere. 

 

Right you are.  I did sort of gloss over that part.  I think I understand now.  You're doing the PP because it's easier, not because it's better.   Wait, maybe that didn't come out quite right  :-)  

 

Cheers,

Rusty (stirrin' up trouble)

 

Rusty,

I think if I could get away from using PP ( easily) I would do that - your half way right, as who needs to contend with the possibility of troublesome idling.

On the other hand, the port does breath better, it will most definitely give more power, especially to the single rotor application and the plumbing is a 1:1.

 

To say that PP is better is wrong, but it may be better for some applications and indeed worse for others. For instance I don't understand PP for road use, just crazy!

George ( down under)