Well, telling you upfront that I am not flying a 13B; I disagree with Ed, I don't think you will see that sort of power with a side port 13B unless you are over 7500 RPM. At leaast this is what I think based on some dyno runs with various side port engines I have built. P-Port is the way to go.

Hans


On Nov 8, 2006, at 9:03 PM, Ed Anderson wrote:

Hi Doug,
 
If you want to develop between 160 and 170 HP from a 13B, I for one would not consider a P port.  The reason, is that the stock 13B will easily give you that kind of power with less effort and cost.  If you wanted HP on the order of 200 + then a P port might be one approach to consider. 
 
Now if you simply want to experiment with a P port, then got to it.  But, it is simply not needed for the power levels you are looking for.
 
The only person I am aware of who may have the information you want is Jerry Hey - he use to be on the list, but I have not seeing anything from him recently.    This is the last e mail address I have for Jerry Hey
E-mail Address(es):
  jerryhey@earthlink.net
 
you might send him a message.
 
 
Best Regards
 
Ed

----- Original Message -----
From: DLOMHEIM@aol.com
To: Rotary motors in aircraft
Sent: Wednesday, November 08, 2006 10:45 PM
Subject: [FlyRotary] P Porting template?


I have a friend in Denver who is willing to set up his milling machine to mill out some P-Ports on a couple of my old rotor housings over Thanksgiving break.  My question is if any of you know where I can get a copy of a template for use with 1.5" diameter intake pipes.  I would think there would be something in the public domain by now (but I could be wrong).  The potential benefits of a P-Port make it pretty attractive to at least experiment with at some point and I will be happy to develop between 160 and 170 hp in my 9A so I think that should be doable...
 
Doug
RV-9A, 13B installation