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Date: Mon, 1 Jul 2013 12:36:06 -0500
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Subject: Re: [FlyRotary] Twin 46mm throttle bodies... I can't seem to find the room.
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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William,

For a point of reference, I'm running three 46mm TB's on my n/a p-port
3-rotor, and they are working great.  This is my third intake, second for
the p-port engine.  This is installed in a Lancair ES, so it probably has
more room under the cowl that you have.  If your engine isn't
peripheral-ported, then you're probably better off with a single TB.

Mark S.


On Mon, Jul 1, 2013 at 10:17 AM, William Mason <instructorbill@msn.com>wrote:

> I bought a pair of arctic cat throttle bodies for the turbo 13b, quite
> impressive units really.   Here is the problem--  the fuel rail and
> injectors make the entire unit far too large to use as-is, so the injectors
> have been deleted.  I have already lopped off the extra fittings on the
> tb's that allow for a fuel pass through, I've removed the oil fill tube
> from the center iron and I plan to move it to the front cover (OMP slot)
> and I may do the same to the oil dipstick.
>
>
> Since the cowling slopes gently to the spinner, most if not all of my
> clearance problems occur with the front throttle body.
>
> I tried moving it rearward on the top side of the engine but either the
> TPS gets in the way of the turbo oil outlet or it points to the front rotor
> housing and I wouldn't be able to plug in.  I flip it over and it's too
> tall.
>
> If I dangle it off the plug side, different issues-- radiator duct outlet
> clearance, alternator interference or if I raise it to move away from the
> alternator-- I hit the colwing again.
>
> I know that other users have had some success using a Ford Mustang TB, but
> what did you do with the IACV circuit?
>
> *Is one 46mm throttle body too small? * I'm considering using just one of
> the Arctic Cat's throttle bodies and see how it does.  The turbo outlet is
> 2 inches, the intercooler in and out also 2 inches and the TB is 46mm or
> 1.81 inches.  Take some more away for the plate and throttle shaft and
> there is even less.  Will force feeding this monster help?
>
> Please give me your experience with Mustang throttle bodies.
> Where you used a Mustang TB, did you choke it down to a smaller tube
> afterwards?
>
> Since I don't have  a flow bench-- do I have any options to see how this
> TB flows compared to a 2 inch pipe?
>
>
>
>

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<div dir=3D"ltr"><div>William, </div><div>=A0</div><div>For a point of refe=
rence, I&#39;m running three 46mm TB&#39;s on my n/a=A0p-port 3-rotor, and =
they are working great.=A0 This is my third intake, second for the p-port e=
ngine.=A0 This is installed in a Lancair ES, so it probably has more room u=
nder the cowl that you have.=A0 If your engine isn&#39;t peripheral-ported,=
 then you&#39;re probably better off with a single TB.</div>
<div>=A0</div><div>Mark S.</div></div><div class=3D"gmail_extra"><br><br><d=
iv class=3D"gmail_quote">On Mon, Jul 1, 2013 at 10:17 AM, William Mason <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:instructorbill@msn.com" target=3D"_bla=
nk">instructorbill@msn.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">


<div><div dir=3D"ltr">I bought a pair of arctic cat throttle bodies for the=
 turbo 13b, quite impressive units really. =A0 Here is the problem-- =A0the=
 fuel rail and injectors make the entire unit far too large to use as-is, s=
o the injectors have been deleted. =A0I have already lopped off the extra f=
ittings on the tb&#39;s that allow for a fuel pass through, I&#39;ve remove=
d the oil fill tube from the center iron and I plan to move it to the front=
 cover (OMP slot) and I may do the same to the oil dipstick.<div>
<br></div><div><br></div><div>Since the cowling slopes gently to the spinne=
r, most if not all of my clearance problems occur with the front throttle b=
ody.</div><div><br></div><div>I tried moving it rearward on the top side of=
 the engine but either the TPS gets in the way of the turbo oil outlet or i=
t points to the front rotor housing and I wouldn&#39;t be able to plug in. =
=A0I flip it over and it&#39;s too tall.</div>
<div><br></div><div>If I dangle it off the plug side, different issues-- ra=
diator duct outlet clearance, alternator interference or if I raise it to m=
ove away from the alternator-- I hit the colwing again.</div><div><br></div=
>
<div>I know that other users have had some success using a Ford Mustang TB,=
 but what did you do with the IACV circuit? =A0</div><div><br></div><div><b=
>Is one 46mm throttle body too small? </b>=A0I&#39;m considering using just=
 one of the Arctic Cat&#39;s throttle bodies and see how it does. =A0The tu=
rbo outlet is 2 inches, the intercooler in and out also 2 inches and the TB=
 is 46mm or 1.81 inches. =A0Take some more away for the plate and throttle =
shaft and there is even less. =A0Will force feeding this monster help? =A0<=
/div>
<div><br></div><div>Please give me your experience with Mustang throttle bo=
dies. =A0</div><div>Where you used a Mustang TB, did you choke it down to a=
 smaller tube afterwards? =A0</div><div><br></div><div>Since I don&#39;t ha=
ve =A0a flow bench-- do I have any options to see how this TB flows compare=
d to a 2 inch pipe?</div>
<div><br><div><br></div><div><br></div></div> 		 	   		  </div></div>
</blockquote></div><br></div>

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