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Re: [Fot] SU carb smooth bore or leave rough?

To: David Gott <triumphsix@yahoo.com>
Subject: Re: [Fot] SU carb smooth bore or leave rough?
From: Bruce Stutzman via Fot <fot@autox.team.net>
Date: Wed, 25 Nov 2020 12:34:34 -0500
Cc: Mike Harmuth via Fot <fot@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: fot@autox.team.net
References: <CAO0FjVaRm76NhVcLse-d7V731+wzH7wwH7GtxRSAdVWv1J5icw@mail.gmail.com> <1226655541.35367.1606322066206@connect.xfinity.com> <303743946.941393.1606323694053@mail.yahoo.com>
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Back in the day we thought we needed the bridge to help mix the incoming
air with the fuel.
Bruce

On Wed, Nov 25, 2020 at 12:04 PM David Gott via Fot <fot@autox.team.net>
wrote:

> Hi Mike,
>
> My TR4 came with a pair of Computune set up HS6=E2=80=99s that have had t=
he damper
> removed, and the whole bridge at the jet removed.  The jet stands alone o=
n
> its own, sticking up the height of the former bridge.  Also, the throttle
> shafts are Steel, and very thin, only picking up the throttle plate on on=
e
> side.  Alas, the steel has worn out the aluminum body and needs bushings
> badly.  I=E2=80=99m sure they flow great, but without the bridge, probabl=
y tough to
> drive at anything other than WOT.   I bet part throttle modulation is
> difficult, but good dyno numbers are sure to be there....  I will try the=
m
> some day!  Anyone have experience running the Computune carbs?
>
> Dave Gott
>
>
> Sent from Yahoo Mail for iPhone
> <https://overview.mail.yahoo.com/?.src=3DiOS>
>
> On Wednesday, November 25, 2020, 11:34 AM, DAVE HOGYE via Fot <
> fot@autox.team.net> wrote:
>
> I know that Huffaker does this.  I believe they also remove the damper oi=
l
> and or the damper completely and shave down the throttle shaft to almost
> nothing.  So, I don't think you'd be trashing them, but I don't know what
> the dyno results are either. As far as I know, they also replace head
> gaskets and engines quite regularly on their BMC builds.
> Dave H.
>
>
> On 11/24/2020 12:41 PM Mike Harmuth via Fot <fot@autox.team.net> wrote:
>
>
>
> I was going over my race carbs (SU H4)and wondered if there's anything to
> be gained  (or lost) by smoothing out the casting (before the jet)? I'm n=
ot
> sure if it's designed (or left) that way to promote turbulence and better
> mixing as the air flows over the jet or if polishing it down would help.
>
> I'd hate to trash a pair of good carbs before I get some answers.
>
> thanks
> mike h
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>

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<div dir=3D"ltr">Back in the day we thought we needed the bridge to help mi=
x the incoming air with the fuel.<div>Bruce</div></div><br><div class=3D"gm=
ail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Nov 25, 2020 at 12=
:04 PM David Gott via Fot &lt;<a href=3D"mailto:fot@autox.team.net";>fot@aut=
ox.team.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><div>
Hi Mike,<div><br></div><div>My TR4 came with a pair of Computune set up HS6=
=E2=80=99s that have had the damper removed, and the whole bridge at the je=
t removed.=C2=A0 The jet stands alone on its own, sticking up the height of=
 the former bridge.=C2=A0 Also, the throttle shafts are Steel, and very thi=
n, only picking up the throttle plate on one side.=C2=A0 Alas, the steel ha=
s worn out the aluminum body and needs bushings badly.=C2=A0 I=E2=80=99m su=
re they flow great, but without the bridge, probably tough to drive at anyt=
hing other than WOT. =C2=A0 I bet part throttle modulation is difficult, bu=
t good dyno numbers are sure to be there....=C2=A0 I will try them some day=
!=C2=A0 Anyone have experience running the Computune carbs?=C2=A0=C2=A0</di=
v><div><br></div><div>Dave Gott<br><br><br><a href=3D"https://overview.mail=
.yahoo.com/?.src=3DiOS" target=3D"_blank">Sent from Yahoo Mail for iPhone</=
a><br><br><p style=3D"font-size:15px;color:rgb(113,95,250);padding-top:15px=
;margin-top:0px">On Wednesday, November 25, 2020, 11:34 AM, DAVE HOGYE via =
Fot &lt;<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.t=
eam.net</a>&gt; wrote:</p><blockquote><div id=3D"gmail-m_445302584176418828=
9yiv4410313316"><div>
  <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
   <span style=3D"font-family:helvetica;font-size:12pt">I know that Huffake=
r does this.=C2=A0 I believe they also remove the damper oil and or the dam=
per completely and shave down the throttle shaft to almost nothing.=C2=A0 S=
o, I don&#39;t think you&#39;d be trashing them, but I don&#39;t know what =
the dyno results are either. As far as I know, they also replace head gaske=
ts and engines quite regularly on their BMC builds.=C2=A0=C2=A0</span>
  </div>=20
  <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
   <span style=3D"font-family:helvetica;font-size:12pt">Dave H.=C2=A0</span=
>
  </div>=20
  <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
   =C2=A0
  </div>=20
  <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:rgb(51,51,51)">
   =C2=A0
  </div>=20
  <div id=3D"gmail-m_4453025841764188289yiv4410313316yqt59346"><div style=
=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color:rgb(51,51,5=
1)">
   On 11/24/2020 12:41 PM Mike Harmuth via Fot &lt;<a href=3D"mailto:fot@au=
tox.team.net" target=3D"_blank">fot@autox.team.net</a>&gt; wrote:
  </div>=20
  <blockquote type=3D"cite">=20
   <div>
    =C2=A0
   </div>=20
   <div>
    =C2=A0
   </div>=20
   <div dir=3D"ltr">
    I was going over my race carbs (SU H4)and wondered if there&#39;s anyth=
ing to be gained=C2=A0 (or lost) by smoothing out the casting (before the j=
et)? I&#39;m not sure if it&#39;s designed (or left) that way to promote tu=
rbulence and better mixing as the air flows over the jet or if polishing it=
 down would help.=20
    <div>
     =C2=A0
    </div>=20
    <div>
     I&#39;d hate to trash a pair of good carbs before I get some answers.
    </div>=20
    <div>
     =C2=A0
    </div>=20
    <div>
     thanks
    </div>=20
    <div>
     mike h
    </div>=20
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  </blockquote></div>=20
 </div></div><div id=3D"gmail-m_4453025841764188289yqt35642">______________=
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