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From: "Mark Steitle" <flyrotary@lancaironline.net>
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Date: Fri, 6 Feb 2015 06:49:28 -0600
Message-ID: <CAHh3jbN7ACRa5PJLkOHeheJGE7hDryYxG80tumfS0J12aoHPbQ@mail.gmail.com>
Subject: Re: [FlyRotary] 20B Engines
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Kelly,

I wouldn't hesitate to use an early 20b.  The early 20b housings are plenty
robust enough for a/c use.  The beefier irons could be an issue if you're
building a turbo race engine due to the higher loads imposed during up
shifting and down shifting.  We don't experience any of those loads.

I'm pretty certain that my 20b is an early model and I have not experienced
any issues with irons cracking around the dowels.  The weakest area is
along the inner walls of the o-ring grooves nearest the water jackets. If
your o-rings aren't to factory specs, you run the risk of cracking an
o-ring wall which ruins the housing.  Been there, done that.  If you treat
the engine with the same care you would a certified a/c engine, then you
won't have any trouble with longevity.

Mark

On Fri, Feb 6, 2015 at 12:00 AM, Kelly Troyer <flyrotary@lancaironline.net>
wrote:

>  Mark Steitle or other 20B Drivers,
>
>      I am looking at a 20B that looks to be an early one before they added
> additional
> metal in the dowel/oil passage area of the iron housings because of some
> that I have
> read developed cracks in this area in service in the autos I presume.......
>
>      Can you tell me if this a potential problem for the 20B in our
> aircraft use ?.......Also
> can you tell me if your 20B has the later reinforced housings ?.........
>
> --
> Kelly Troyer
>
>

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<div dir=3D"ltr"><div><div><div>Kelly, <br><br></div>I wouldn&#39;t hesitat=
e to use an early 20b.=A0 The early 20b housings are plenty robust enough f=
or a/c use.=A0 The beefier irons could be an issue if you&#39;re building a=
 turbo race engine due to the higher loads imposed during up shifting and d=
own shifting.=A0 We don&#39;t experience any of those loads.=A0 <br><br></d=
iv>I&#39;m pretty certain that my 20b is an early model and I have not expe=
rienced any issues with irons cracking around the dowels.=A0 The weakest ar=
ea is along the inner walls of the o-ring grooves nearest the water jackets=
. If your o-rings aren&#39;t to factory specs, you run the risk of cracking=
 an o-ring wall which ruins the housing.=A0 Been there, done that.=A0 If yo=
u treat the engine with the same care you would a certified a/c engine, the=
n you won&#39;t have any trouble with longevity. <br><br></div>Mark<br></di=
v><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Fri, Feb 6, =
2015 at 12:00 AM, Kelly Troyer <span dir=3D"ltr">&lt;<a href=3D"mailto:flyr=
otary@lancaironline.net" target=3D"_blank">flyrotary@lancaironline.net</a>&=
gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 =
0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">=A0Mar=
k Steitle or other 20B Drivers,<div><br></div><div>=A0 =A0 =A0I am looking =
at a 20B that looks to be an early one before they added additional</div><d=
iv>metal in the dowel/oil passage area of the iron housings because of some=
 that I have</div><div>read developed cracks in this area in service in the=
 autos I presume.......</div><div><br></div><div>=A0 =A0 =A0Can you tell me=
 if this a potential problem for the 20B in our aircraft use ?.......Also</=
div><div>can you tell me if your 20B has the later reinforced housings ?...=
...... =A0</div><span class=3D"HOEnZb"><font color=3D"#888888"><div><div><b=
r></div>-- <br><div>Kelly Troyer<br><br></div>
</div></font></span></div>
</blockquote></div><br></div>

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