Mailing List flyrotary@lancaironline.net Message #62140
From: Bill Schertz <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: To P or not...
Date: Wed, 7 Oct 2015 08:03:39 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
can you give details on your custom built hotdog with inox? baffling.
 
Thanks
Bill Schertz
 
Sent: Tuesday, October 06, 2015 11:08 PM
Subject: [FlyRotary] Re: To P or not...
 
I would agree, yes it worked out to be allot more simpler running 2 x 2" runners than playing with 4 in my opinion and  easier to manufactur etc
From modifying my engine from a not so good 6 port intake to a simple 2 port intake I gained a good 30-40 hp and 15 k top end
The noise also isn't that bad on my renises as I've attached a custom built hotdog underneath with inox baffling which works well


Sent from my iPhone

On 7 Oct 2015, at 1:34 pm, Mark McClure <flyrotary@lancaironline.net> wrote:

Trying to ensure I have a complete knowledge before I make my decision,
 
The P port as shown for the website is exactly what we are looking for. Straight forward power at high rpm.  The noise is a factor of energy output which is the same. 
 
If I tune a 4 port runner system and get x amount of air into the engine I give y amount of fuel and I have z amount of power and engine exhaust/noise to handle.
 
If I use a P port and get x amount of air and give y amount of fuel it is the exact same z output.  It was just easier to get x amount of air into the system.
 
Or am I completely off base.



On Oct 6, 2015, at 2:17 PM, William Jepson <flyrotary@lancaironline.net> wrote:

Bob,
One thing that everyone should get clear is that for aircraft PPorts are almost always superior. At higher RPMs. Also Pports will idle just fine. Good balance and vibration control are the key to good idle. The engine won't make a lot of power at low rpm but that isn't a problem for an aircraft. The rotary makes a better aircraft engine than a car engine!

Bill Jepson

On Oct 6, 2015 9:14 AM, "Rogers, Bob J." <flyrotary@lancaironline.net> wrote:
You should read the description of the effects of P-porting at this website.  See bottom entry.   http://www.mazdarotary.net/porting.htm  And it is loud!!!  See https://www.youtube.com/watch?v=Jebl2pWaiWI

Bob J. Rogers

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, October 06, 2015 10:33 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] To P or not...

I understand the benefits of P porting the engine.  And I think I know the answer to my question but thought I'd verify.

Looking for 180-200 hp.  I have a freshly overhauled 2004 4 port 13b.
If the intake and exhaust are built right I should have no problem getting that power NA.

If I P port the intake it will be easier to make 200 or more. however it is just easier to get air into the engine, and therefore more fuel. But it is not by any means more fuel efficient?

So therefore if I don't need the power I don't need to P port.

Mark


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