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

To: DAVE HOGYE <dlhogye@comcast.net>, Mike Harmuth <ofracer@gmail.com>, Mike Harmuth via Fot <fot@autox.team.net>
Subject: Re: [Fot] SU carb smooth bore or leave rough?
From: David Gott via Fot <fot@autox.team.net>
Date: Wed, 25 Nov 2020 17:01:34 +0000 (UTC)
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> CFNetwork/1206 Darwin/20.1.0
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Hi Mike,
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 jet removed. =C2=A0The jet sta=
nds alone on its own, sticking up the height of the former bridge.=C2=A0 Al=
so, the throttle shafts are Steel, and very thin, only picking up the throt=
tle plate on one side. =C2=A0Alas, the steel has worn out the aluminum body=
 and needs bushings badly. =C2=A0I=E2=80=99m sure they flow great, but with=
out the bridge, probably tough to drive at anything other than WOT. =C2=A0 =
I bet part throttle modulation is difficult, but good dyno numbers are sure=
 to be there.... =C2=A0I will try them some day! =C2=A0Anyone have experien=
ce running the Computune carbs?=C2=A0=C2=A0
Dave Gott


Sent from Yahoo Mail for iPhone


On Wednesday, November 25, 2020, 11:34 AM, DAVE HOGYE via Fot <fot@autox.te=
am.net> wrote:

  I know that Huffaker does this.=C2=A0 I believe they also remove the damp=
er oil and or the damper completely and shave down the throttle shaft to al=
most nothing.=C2=A0 So, I don't think you'd be trashing them, but I don't k=
now what the dyno results are either. As far as I know, they also replace h=
ead gaskets and engines quite regularly on their BMC builds.=C2=A0=C2=A0   =
Dave H.=C2=A0   =C2=A0   =C2=A0   On 11/24/2020 12:41 PM Mike Harmuth via F=
ot <fot@autox.team.net> wrote: =20
  =C2=A0   =C2=A0   I was going over my race carbs (SU H4)and wondered if t=
here's anything to be gained=C2=A0 (or lost) by smoothing out the casting (=
before the jet)? I'm not sure if it's designed (or left) that way to promot=
e turbulence and better mixing as the air flows over the jet or if polishin=
g it down would help.  =C2=A0   I'd hate to trash a pair of good carbs befo=
re I get some answers.   =C2=A0   thanks   mike h   _______________________=
________________________=20
fot@autox.team.net=20
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=20
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot=20
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if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>=
96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><bo=
dy>
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. &nbsp;The jet stands alone on its own, sticking up the height of=
 the former bridge.&nbsp; Also, the throttle shafts are Steel, and very thi=
n, only picking up the throttle plate on one side. &nbsp;Alas, the steel ha=
s worn out the aluminum body and needs bushings badly. &nbsp;I=E2=80=99m su=
re they flow great, but without the bridge, probably tough to drive at anyt=
hing other than WOT. &nbsp; I bet part throttle modulation is difficult, bu=
t good dyno numbers are sure to be there.... &nbsp;I will try them some day=
! &nbsp;Anyone have experience running the Computune carbs?&nbsp;&nbsp;</di=
v><div><br></div><div>Dave Gott<br><br><br><a href=3D"https://overview.mail=
.yahoo.com/?.src=3DiOS">Sent from Yahoo Mail for iPhone</a><br><br><p class=
=3D"yahoo-quoted-begin" style=3D"font-size: 15px; color: #715FFA; padding-t=
op: 15px; margin-top: 0">On Wednesday, November 25, 2020, 11:34 AM, DAVE HO=
GYE via Fot &lt;fot@autox.team.net&gt; wrote:</p><blockquote class=3D"iosym=
ail"><div id=3D"yiv4410313316"><div>
  <div style=3D"font-size:12pt;font-family:helvetica, arial, sans-serif;col=
or:#333333;">
   <span style=3D"font-family:helvetica;font-size:12pt;">I know that Huffak=
er does this.&nbsp; I believe they also remove the damper oil and or the da=
mper completely and shave down the throttle shaft to almost nothing.&nbsp; =
So, I don't think you'd be trashing them, but I don't know what the dyno re=
sults are either. As far as I know, they also replace head gaskets and engi=
nes quite regularly on their BMC builds.&nbsp;&nbsp;</span>
  </div>=20
  <div style=3D"font-size:12pt;font-family:helvetica, arial, sans-serif;col=
or:#333333;">
   <span style=3D"font-family:helvetica;font-size:12pt;">Dave H.&nbsp;</spa=
n>
  </div>=20
  <div style=3D"font-size:12pt;font-family:helvetica, arial, sans-serif;col=
or:#333333;">
   &nbsp;
  </div>=20
  <div style=3D"font-size:12pt;font-family:helvetica, arial, sans-serif;col=
or:#333333;">
   &nbsp;
  </div>=20
  <div class=3D"yiv4410313316yqt1393280786" id=3D"yiv4410313316yqt59346"><d=
iv style=3D"font-size:12pt;font-family:helvetica, arial, sans-serif;color:#=
333333;">
   On 11/24/2020 12:41 PM Mike Harmuth via Fot &lt;fot@autox.team.net&gt; w=
rote:
  </div>=20
  <blockquote type=3D"cite">=20
   <div>
    &nbsp;
   </div>=20
   <div>
    &nbsp;
   </div>=20
   <div dir=3D"ltr">
    I was going over my race carbs (SU H4)and wondered if there's anything =
to be gained&nbsp; (or lost) by smoothing out the casting (before the jet)?=
 I'm not 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.=20
    <div>
     &nbsp;
    </div>=20
    <div>
     I'd hate to trash a pair of good carbs before I get some answers.
    </div>=20
    <div>
     &nbsp;
    </div>=20
    <div>
     thanks
    </div>=20
    <div>
     mike h
    </div>=20
   </div> _______________________________________________
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ions/fot/dlhogye@comcast.net
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  </blockquote></div>=20
 </div></div><div class=3D"yqt1393280786" id=3D"yqt35642">_________________=
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