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Date: Sat, 24 Nov 2012 07:36:50 -0600
Message-ID: <CAHh3jbMbCZ==z4Rrrm7+aNpBqvkg_gcYgRqjAc_uo2i00t37Ug@mail.gmail.com>
Subject: Re: [FlyRotary] Defined Autoworks parts site / Mark's 20B Date: Fri,
 23 Nov 2012 21:59:55 -0600
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Doug,

That's true.  It is almost like an entirely different engine, especially
the MAP readings.  I guess you could compare it to installing a radical cam
in your family driver.  It would drastically alter the driving
characteristics.  Tracy is working on a fix for the MAP issue on P-Port
engines.  It only hits two addresses between idle and 4500 rpm.  Hopefully,
the fix will help it to run smoother through the transition.

It also required a whole new intake.  I tried the slide throttle, but there
were some issues I didn't especially like, so I built one using three 46mm
snowmobile throttle bodies.  It has worked out great.  It especially
improved the idle characteristics, probably due to having the primary
injectors located downstream of the throttle plates.  I had some fuel
pooling issues with having them located upstream.  The snowmobile tb's also
operate much smoother than the slide throttle.  At idle, vacuum sucks the
slide against the downstream side plate with a significant force, making it
difficult to work the throttle.

And... it now burns more fuel than before.  DUH!  I could throttle back and
fly slower, but who wants to do that???

Mark S.

On Sat, Nov 24, 2012 at 3:43 AM, <DLOMHEIM@aol.com> wrote:

> **
> Mark Steitle wrote:
>
> >"...What I can say is that I picked up 20+ knots on the top end over the
> original side-port 20b motor".
>
> That is outstanding Mark!  I'd almost bet that your PP modification was
> one of the "easiest" ways to gain those hp numbers vs. a turbo /
> supercharger add on?  Probably wouldn't seem like it as you were going
> through the "tweaking" phase, etc... :)
>
> Doug
>
>

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Doug,<div><br></div><div>That&#39;s true. =A0It is almost like an entirely =
different engine, especially the MAP readings. =A0I guess you could compare=
 it to installing a radical cam in your family driver. =A0It would drastica=
lly alter the driving characteristics. =A0Tracy is working on a fix for the=
 MAP issue on P-Port engines. =A0It only hits two addresses between idle an=
d 4500 rpm. =A0Hopefully, the fix will help it to run smoother through the =
transition. =A0=A0<div>
<br></div><div>It also required a whole new intake. =A0I tried the slide th=
rottle, but there were some issues I didn&#39;t especially like, so I built=
 one using three 46mm snowmobile throttle bodies. =A0It has worked out grea=
t. =A0It especially improved the idle characteristics, probably due to havi=
ng the primary injectors located downstream of the throttle plates. =A0I ha=
d some fuel pooling issues with having them located upstream. =A0The snowmo=
bile tb&#39;s also operate much smoother than the slide throttle. =A0At idl=
e, vacuum sucks the slide against the downstream side plate with a signific=
ant force, making it difficult to work the throttle.<br>
<br>And... it now burns more fuel than before. =A0DUH! =A0I could throttle =
back and fly slower, but who wants to do that???</div><div><br></div><div>M=
ark S.</div><div><br><div class=3D"gmail_quote">On Sat, Nov 24, 2012 at 3:4=
3 AM,  <span dir=3D"ltr">&lt;<a href=3D"mailto:DLOMHEIM@aol.com" target=3D"=
_blank">DLOMHEIM@aol.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><u></u>



<div style=3D"font-size:10pt;font-family:Arial"><font color=3D"#000000" fac=
e=3D"Arial">
<div>Mark Steitle wrote:</div>
<div>=A0</div>
<div>&gt;&quot;...What I can say is that I picked up 20+ knots on the top e=
nd over=20
the original side-port 20b motor&quot;.</div>
<div>=A0</div>
<div>That is outstanding Mark!=A0=A0I&#39;d almost bet that your PP=20
modification was one of the=A0&quot;easiest&quot;=A0ways to gain those=A0hp=
=20
numbers vs. a turbo / supercharger add on?=A0 Probably=A0wouldn&#39;t seem=
=20
like it as=A0you were going through the=A0&quot;tweaking&quot; phase, etc..=
.=20
:)</div>
<div>=A0</div>
<div>Doug=A0</div>
<div>=A0</div></font></div></blockquote></div><br></div></div>

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