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Message-ID: <5cf132c0807241718h7c58fc28u869e03f91b31e9d1@mail.gmail.com>
Date: Thu, 24 Jul 2008 19:18:06 -0500
From: "Mark Steitle" <msteitle@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] 13B--- N/A vs. Turbo engine buildup?
In-Reply-To: <list-3040990@logan.com>
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Paul,

I am running a N/A 20B-REW (twin turbo) rotary in my Lancair.  It has the
stock 9.0 rotors.  I've read over and over that at the rpm range we operate=
,
there is very little difference in power between low and high compression
rotors.  I doubt that anyone that's ridden in my Lancair would say that it
is a "dog".  However, I did do a little porting, so probably helps to offse=
t
the low compression rotors.  You can use high compression rotors, but you'l=
l
need to have it rebalanced.  I used the stock turbo rotors because I may
want to turbo-charge later on and didn't want to tear the engine down again
to change rotors.

Mark

On Thu, Jul 24, 2008 at 5:20 PM, Paul Vermillion <paulo264@cox.net> wrote:

>
>
>
>
> * *
> *Subject:* 13B--- N/A vs. Turbo engine buildup?
>
>
>
> To Everyone=97
>
>                 We have both a 13*b * NA (unknown vintage=9780's?) and a =
'91
> Turbo 13B engine and are just beginning their teardowns, both allegedly
> running but internal condition unknown.   Would there be any problem runn=
ing
> the Turbo engine (BUT *NOT* with the turbo setup-- *AS IF* it were a NA
> engine)?  Is it a "stronger" engine than the NA?  Would it need a differe=
nt
> Timing setup?  Would there be a compression problem running it sans turbo=
?
> (Hearsay has it that it would be a "dog".)  If some of the individual par=
ts
> spec out to be better in one engine but not in the other, would there be =
any
> problem/advantage in "mixing & matching" the various parts in the newly
> built up engine, i.e., rotaries, side plates, eccentric shaft, etc?   We
> would appreciate your inputs.    Thanks!
>
>
>
> Paul & Don Vermillion
>

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<div dir=3D"ltr">Paul, <br><br>I am running a N/A 20B-REW (twin turbo) rota=
ry in my Lancair.&nbsp; It has the stock 9.0 rotors.&nbsp; I&#39;ve read ov=
er and over that at the rpm range we operate, there is very little differen=
ce in power between low and high compression rotors.&nbsp; I doubt that any=
one that&#39;s ridden in my Lancair would say that it is a &quot;dog&quot;.=
&nbsp; However, I did do a little porting, so probably helps to offset the =
low compression rotors.&nbsp; You can use high compression rotors, but you&=
#39;ll need to have it rebalanced.&nbsp; I used the stock turbo rotors beca=
use I may want to turbo-charge later on and didn&#39;t want to tear the eng=
ine down again to change rotors.&nbsp; <br>
<br>Mark <br><br><div class=3D"gmail_quote">On Thu, Jul 24, 2008 at 5:20 PM=
, Paul  Vermillion &lt;<a href=3D"mailto:paulo264@cox.net">paulo264@cox.net=
</a>&gt; wrote:<br><blockquote class=3D"gmail_quote" style=3D"border-left: =
1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;=
">









<div link=3D"blue" vlink=3D"purple" lang=3D"EN-US">

<div>

<p><span style=3D"color: rgb(31, 73, 125);">&nbsp;</span></p>

<p><span style=3D"color: rgb(31, 73, 125);">&nbsp;</span></p>

<div>

<div style=3D"border-style: solid none none; border-color: rgb(181, 196, 22=
3) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium=
; padding: 3pt 0in 0in;">

<p><b><span style=3D"font-size: 10pt;">&nbsp;</span></b><span style=3D"font=
-size: 10pt;"><br>
<b>Subject:</b> 13B--- N/A vs. Turbo engine buildup?</span></p>

</div>

</div>

<p>&nbsp;</p>

<p>To Everyone=97</p>

<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;
We have both a 13<b>b </b>&nbsp;NA (unknown vintage=9780's?) and a
'91 Turbo 13B engine and are just beginning their teardowns, both
allegedly running but internal condition unknown.&nbsp;&nbsp; Would there b=
e
any problem running the Turbo engine (BUT <u>NOT</u> with the turbo setup--=
 <u>AS
IF</u> it were a NA engine)?&nbsp; Is it a "stronger" engine than
the NA? &nbsp;Would it need a different Timing setup?&nbsp; Would there be =
a
compression problem running it sans turbo? (Hearsay has it that it would be=
 a
"dog".)&nbsp; If some of the individual parts spec out to be better
in one engine but not in the other, would there be any problem/advantage in
"mixing &amp; matching" the various parts in the newly built up
engine, i.e., rotaries, side plates, eccentric shaft, etc?&nbsp;&nbsp; We w=
ould
appreciate your inputs.&nbsp; &nbsp;&nbsp;Thanks!</p>

<p>&nbsp;</p>

<p>Paul &amp; Don Vermillion</p>

</div>

</div>


</blockquote></div><br></div>

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