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From: "William Jepson" <flyrotary@lancaironline.net>
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Date: Tue, 6 Oct 2015 11:17:53 -0700
Message-ID: <CAN=mtact_=wrL_KFHDAmc0u80-QTNJFdsZtpEk_kHZsAdUUcyA@mail.gmail.com>
Subject: Re: [FlyRotary] Re: To P or not...
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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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
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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<p dir=3D"ltr">Bob,<br>
One thing that everyone should get clear is that for aircraft PPorts are al=
most 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&#39=
;t make a lot of power at low rpm but that isn&#39;t a problem for an aircr=
aft. The rotary makes a better aircraft engine than a car engine!</p>
<p dir=3D"ltr">Bill Jepson</p>
<div class=3D"gmail_quote">On Oct 6, 2015 9:14 AM, &quot;Rogers, Bob J.&quo=
t; &lt;<a href=3D"mailto:flyrotary@lancaironline.net">flyrotary@lancaironli=
ne.net</a>&gt; wrote:<br type=3D"attribution"><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex=
">You should read the description of the effects of P-porting at this websi=
te.=C2=A0 See bottom entry.=C2=A0 =C2=A0<a href=3D"http://www.mazdarotary.n=
et/porting.htm" rel=3D"noreferrer" target=3D"_blank">http://www.mazdarotary=
.net/porting.htm</a>=C2=A0 And it is loud!!!=C2=A0 See <a href=3D"https://w=
ww.youtube.com/watch?v=3DJebl2pWaiWI" rel=3D"noreferrer" target=3D"_blank">=
https://www.youtube.com/watch?v=3DJebl2pWaiWI</a><br>
<br>
Bob J. Rogers<br>
<br>
-----Original Message-----<br>
From: Rotary motors in aircraft [mailto:<a href=3D"mailto:flyrotary@lancair=
online.net">flyrotary@lancaironline.net</a>]<br>
Sent: Tuesday, October 06, 2015 10:33 AM<br>
To: Rotary motors in aircraft<br>
Subject: [FlyRotary] To P or not...<br>
<br>
I understand the benefits of P porting the engine.=C2=A0 And I think I know=
 the answer to my question but thought I&#39;d verify.<br>
<br>
Looking for 180-200 hp.=C2=A0 I have a freshly overhauled 2004 4 port 13b.<=
br>
If the intake and exhaust are built right I should have no problem getting =
that power NA.<br>
<br>
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?<br>
<br>
So therefore if I don&#39;t need the power I don&#39;t need to P port.<br>
<br>
Mark<br>
<br>
<br>
--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
lists/flyrotary/List.html" rel=3D"noreferrer" target=3D"_blank">http://mail=
.lancaironline.net:81/lists/flyrotary/List.html</a><br>
<br>
<br>
<br>
--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
lists/flyrotary/List.html" rel=3D"noreferrer" target=3D"_blank">http://mail=
.lancaironline.net:81/lists/flyrotary/List.html</a><br>
</blockquote></div>

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