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We'll just have to agree to disagree, Hans
{:>).
Having flown a side port since 1998, I can tell you (and
Tracy Crook can as well) that a side port has NO problem making 160-170 HP -
provided you have a decent induction and exhaust system. Tracy Crook won
the Sun & Fun 100 race flying an old, side port 13B producing right at
200HP. He, of course, is producing even more power with the side port
Rensis engine. At sea level, 6000 rpm should give you a solid
170 HP with a 13B, with the 2.85:1 gear box you can easily get that at
static. 6500 rpm will give you in the vicinity of 190 HP.
There have plenty of dyno runs which also support the fact that the side port
can make plenty of power.
So far, the only flying P port I am aware of is the
Powersport which reportedly produced 215 HP. Mistral is developing a
certifiable version of the rotary and they are sticking with side-port.
Don't want to give you the impression I am against P port
- I'm not. I toyed with the idea of doing it myself, but decided that the
180+ HP I get out of my 91 turbo block with high compression rotors serves my
needs just fine.
So looking forward to seeing the results of those building
and "P" port engines - hey, the results may convince me to venture to the
"....Dark side" {:>). However, the notion that side ports can not
produce 160-170 HP below 7500 rpm is simply not correct.
Ed
Sent: Thursday, November 09, 2006 5:10
AM
Subject: [FlyRotary] Re: P Porting
template?
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
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