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Subject: Re: [FlyRotary] Twin 46mm throttle bodies...  I can't seem to find the room.
References: <list-6356729@logan.com>
From: Tracy <rwstracy@gmail.com>
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Message-Id: <28A76613-6E88-49C8-83CC-12B1D7EF3547@gmail.com>
Date: Mon, 1 Jul 2013 09:25:29 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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At max power, Two 46mm is overkill and one is slightly small but a little ex=
tra boost would make up for it.  In cruise it would be fine.

Tracy

Sent from my iPad

On Jul 1, 2013, at 9:17, William Mason <instructorbill@msn.com> wrote:

> I bought a pair of arctic cat throttle bodies for the turbo 13b, quite imp=
ressive units really.   Here is the problem--  the fuel rail and injectors m=
ake the entire unit far too large to use as-is, so the injectors have been d=
eleted.  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 iro=
n and I plan to move it to the front cover (OMP slot) and I may do the same t=
o the oil dipstick.
>=20
>=20
> Since the cowling slopes gently to the spinner, most if not all of my clea=
rance problems occur with the front throttle body.
>=20
> I tried moving it rearward on the top side of the engine but either the TP=
S gets in the way of the turbo oil outlet or it points to the front rotor ho=
using and I wouldn't be able to plug in.  I flip it over and it's too tall.
>=20
> If I dangle it off the plug side, different issues-- radiator duct outlet c=
learance, alternator interference or if I raise it to move away from the alt=
ernator-- I hit the colwing again.
>=20
> I know that other users have had some success using a Ford Mustang TB, but=
 what did you do with the IACV circuit? =20
>=20
> Is one 46mm throttle body too small?  I'm considering using just one of th=
e Arctic Cat's throttle bodies and see how it does.  The turbo outlet is 2 i=
nches, the intercooler in and out also 2 inches and the TB is 46mm or 1.81 i=
nches.  Take some more away for the plate and throttle shaft and there is ev=
en less.  Will force feeding this monster help? =20
>=20
> Please give me your experience with Mustang throttle bodies. =20
> Where you used a Mustang TB, did you choke it down to a smaller tube after=
wards? =20
>=20
> Since I don't have  a flow bench-- do I have any options to see how this T=
B flows compared to a 2 inch pipe?
>=20
>=20
>=20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>At max power, Two 46mm is overkill and=
 one is slightly small but a little extra boost would make up for it. &nbsp;=
In cruise it would be fine.</div><div><br></div><div>Tracy<br><br>Sent from m=
y iPad</div><div><br>On Jul 1, 2013, at 9:17, William Mason &lt;<a href=3D"m=
ailto:instructorbill@msn.com">instructorbill@msn.com</a>&gt; wrote:<br><br><=
/div><blockquote type=3D"cite"><div>

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<div dir=3D"ltr">I bought a pair of arctic cat throttle bodies for the turbo=
 13b, quite impressive units really. &nbsp; Here is the problem-- &nbsp;the f=
uel rail and injectors make the entire unit far too large to use as-is, so t=
he injectors have been deleted. &nbsp;I have already lopped off the extra fi=
ttings on the tb's that allow for a fuel pass through, I've removed the oil f=
ill tube from the center iron and I plan to move it to the front cover (OMP s=
lot) and I may do the same to the oil dipstick.<div><br></div><div><br></div=
><div>Since the cowling slopes gently to the spinner, most if not all of my c=
learance problems occur with the front throttle body.</div><div><br></div><d=
iv>I tried moving it rearward on the top side of the engine but either the T=
PS gets in the way of the turbo oil outlet or it points to the front rotor h=
ousing and I wouldn't be able to plug in. &nbsp;I flip it over and it's too t=
all.</div><div><br></div><div>If I dangle it off the plug side, different is=
sues-- radiator duct outlet clearance, alternator interference or if I raise=
 it to move away from the alternator-- I hit the colwing again.</div><div><b=
r></div><div>I know that other users have had some success using a Ford Must=
ang TB, but what did you do with the IACV circuit? &nbsp;</div><div><br></di=
v><div><b>Is one 46mm throttle body too small? </b>&nbsp;I'm considering usi=
ng just one of the Arctic Cat's throttle bodies and see how it does. &nbsp;T=
he turbo outlet is 2 inches, the intercooler in and out also 2 inches and th=
e TB is 46mm or 1.81 inches. &nbsp;Take some more away for the plate and thr=
ottle shaft and there is even less. &nbsp;Will force feeding this monster he=
lp? &nbsp;</div><div><br></div><div>Please give me your experience with Must=
ang throttle bodies. &nbsp;</div><div>Where you used a Mustang TB, did you c=
hoke it down to a smaller tube afterwards? &nbsp;</div><div><br></div><div>S=
ince I don't have &nbsp;a flow bench-- do I have any options to see how this=
 TB flows compared to a 2 inch pipe?</div><div><br><div><br></div><div><br><=
/div></div> 		 	   		  </div>
</div></blockquote></body></html>=

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