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Date: Tue, 16 Nov 2010 07:37:36 -0500
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Message-ID: <AANLkTi=Ygir5LFwQ75-wFWGnRadxELSe++zNQNTbDpFK@mail.gmail.com>
Subject: Re: [FlyRotary] Timing for 13B
From: Tracy <tracy@rotaryaviation.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=001485f6ce4c55d60904952ad299

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If the MP is above 24" Hg the nominal timing is 23-24 deg BTDC but typically
the MP will be lower than that while in-flight.  The EC2/3 increases the
advance below 24".  This improves fuel economy. The lower the MP, the more
the 'vacuum advance' is.  Be aware of this if you are trying to set timing
with a timing light (not recommended).

Tracy

On Tue, Nov 16, 2010 at 12:46 AM, <bktrub@aol.com> wrote:

> Just triple checking- the timing for the 13B is 22~ 23 degrees btdc at
> 4000rpm, correct? Just fixing a few small things before getting out and
> flying/tuning. Weather is crappy here in Seattle  so  I'm going over the
> plane and engine again for a few days. I've got a few ideas as to why I
> can't seem to get it to smooth out through my staging area in flight, when
> it runs through the same area smoothly  on the ground.
>
> Brian Trubee
> Rv-4
>
>

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If the MP is above 24&quot; Hg the nominal timing is 23-24 deg BTDC but typ=
ically the MP will be lower than that while in-flight.=A0 The EC2/3 increas=
es the advance below 24&quot;.=A0 This improves fuel economy. The lower the=
 MP, the more the &#39;vacuum advance&#39; is.=A0 Be aware of this if you a=
re trying to set timing with a timing light (not recommended).=A0 <br>
<br>Tracy<br><br><div class=3D"gmail_quote">On Tue, Nov 16, 2010 at 12:46 A=
M,  <span dir=3D"ltr">&lt;<a href=3D"mailto:bktrub@aol.com">bktrub@aol.com<=
/a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:=
 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left=
: 1ex;">
<font color=3D"black" face=3D"arial" size=3D"2">
<div>Just triple checking- the timing for the 13B is 22~=A023 degrees btdc =
at 4000rpm, correct? Just fixing a few small things before getting out and =
flying/tuning. Weather is crappy here in Seattle =A0so=A0 I&#39;m going ove=
r the plane and engine again for a few days. I&#39;ve got a few ideas as to=
 why I can&#39;t seem to get it to smooth out through my staging area in fl=
ight, when it runs through the same area smoothly =A0on the ground. </div>



<div>=A0</div>


<div>Brian Trubee</div>


<div>Rv-4<br>
<br>
</div>


<div style=3D"clear: both;"></div>
</font>
</blockquote></div><br><div style=3D"visibility: hidden; left: -5000px;" id=
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p{position: absolute;z-index: 9999;padding: 0px 0px;margin-left: 0px;margin=
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