Subject: Re: [TR] carb tuning

From: DAVID MASSEY <[email-masked]>
Date: Sun, 22 Sep 2024 01:19:08 +0000 (UTC)

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The lift-the-piston method of tuning only works on pre-emissions carbs (SU)=
.=C2=A0 That is because the SU needles were profiled to do that.=C2=A0 Howe=
ver that makes them run too rich to meet US emissions standards.
The factory method is to use a gas sniffer.=C2=A0 So, yes, you should borro=
w a Gunson or similar device.
Dave

Sent from AOL on Android=20
=20
  On Sat, Sep 21, 2024 at 17:59, dave northrup<[email-masked]> wrote:   =
=20
i have a 72 TR6 with triple carbs.=C2=A0 the engine now has about 400 miles=
 on it, and i am pretty sure the carbs are too rich.

i am aware of the lift-a--piston method of tuning the carbs.

i am wondering if it is worth getting a gunson tuning setup or what is the =
best method for ensuring the carbs are correctly tuned.

i know i need to ascertain the valve gap and timing first.
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Archive: http://www.team.net/pipermail/triumphs=C2=A0 http://www.team.net/a=
rchive

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 =20

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The lift-the-piston method of tuning only works on pre-emissions carbs (SU).&nbsp; That is because the SU needles were profiled to do that.&nbsp; However that makes them run too rich to meet US emissions standards.<div><br></div><div>The factory method is to use a gas sniffer.&nbsp; So, yes, you should borrow a Gunson or similar device.</div><div><br></div><div>Dave<br><br><div id="ymail_android_signature"><a id="ymail_android_signature_link" href="https://play.google.com/store/apps/details?id=com.aol.mobile.aolapp">Sent from AOL on Android</a></div> <br> <blockquote style="margin: 0 0 20px 0;"> <div style="font-family:Roboto, sans-serif; color:#6D00F6;"> <div>On Sat, Sep 21, 2024 at 17:59, dave northrup</div><div>&lt;[email-masked]&gt; wrote:</div> </div> <div style="padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid #6D00F6;"> <div id="yiv2097059035">

<div dir="ltr">
<div id="yiv2097059035divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri, Helvetica, sans-serif;" dir="ltr">
<p>i have a 72 TR6 with triple carbs.&nbsp; the engine now has about 400 miles on it, and i am pretty sure the carbs are too rich.</p>
<p><br>
</p>
<p>i am aware of the lift-a--piston method of tuning the carbs.</p>
<p><br>
</p>
<p>i am wondering if it is worth getting a gunson tuning setup or what is the best method for ensuring the carbs are correctly tuned.</p>
<p><br>
</p>
<p>i know i need to ascertain the valve gap and timing first.</p>
</div>
</div>

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From: Greg Lemon <[email-masked]>
Date: Sun, 22 Sep 2024 08:31:05 -0500

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My opinion, the piston lift method is pretty worthless.  Lift the piston
1/8" by hand on a running motor, and then there's the interpretation of the
what it does after thing.  Lifetime of owning British cars and I know
opinions differ.

I have always fine tuned mostly by how the car drives, especially when
cold.

As the manuals say, start with the jets all the way snugged up, lower them
all 12 flats, see how it runs (may be a different starting setup depending
on the carbs you have but basically middle of the adjustment range).  On
cool day started on the choke the car should need to stay on choke for a
short time, say 20 seconds to a minute, before it will take throttle inputs
without hesitating or bogging down.

Your idle should be nice and even, since you have multiple carbs you may
also want to read the plugs, there are multiple charts for that purpose.

My goal is to have a car that drives well, so the tuning method is
consistent with the goals.

If you want to get all scientific about it get a 02 sensor and a reader for
the exhaust.

Greg Lemon
TR250

On Sat, Sep 21, 2024, 6:54 PM dave northrup <[email-masked]> wrote:

> i have a 72 TR6 with triple carbs.  the engine now has about 400 miles on
> it, and i am pretty sure the carbs are too rich.
>
>
> i am wondering if it is worth getting a gunson tuning setup or what is the
> Donate: http://www.team.net/donate.html
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/triumphs/[email-masked]
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<div dir=3D"auto">My opinion, the piston lift method is pretty worthless.=
=C2=A0 Lift the piston 1/8&quot; by hand on a running motor, and then there=
&#39;s the interpretation of the what it does after thing.=C2=A0 Lifetime o=
f owning British cars and I know opinions differ.<div dir=3D"auto"><br></di=
v><div dir=3D"auto">I have always fine tuned mostly by how the car drives, =
especially when cold.=C2=A0=C2=A0</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">As the manuals say, start with the jets all the way snugged up, l=
ower them all 12 flats, see how it runs (may be a different starting setup =
depending on the carbs you have but basically middle of the adjustment rang=
e).=C2=A0 On cool day started on the choke the car should need to stay on c=
hoke for a short time, say 20 seconds to a minute, before it will take thro=
ttle inputs without hesitating or bogging down.=C2=A0=C2=A0</div><div dir=
=3D"auto"><br></div><div dir=3D"auto">Your idle should be nice and even, si=
nce you have multiple carbs you may also want to read the plugs, there are =
multiple charts for that purpose.</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">My goal is to have a car that drives well, so the tuning method i=
s consistent with the goals.</div><div dir=3D"auto"><br></div><div dir=3D"a=
uto">If you want to get all scientific about it get a 02 sensor and a reade=
r for the exhaust.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Greg =
Lemon</div><div dir=3D"auto">TR250</div></div><br><div class=3D"gmail_quote=
"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Sep 21, 2024, 6:54 PM dave =
northrup &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank" rel=3D"n=
oreferrer">[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">

<div dir=3D"ltr">
<div id=3D"m_-7859598040445666489m_257939906490763181divtagdefaultwrapper" =
style=3D"font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-se=
rif" dir=3D"ltr">
<p>i have a 72 TR6 with triple carbs.=C2=A0 the engine now has about 400 mi=
les on it, and i am pretty sure the carbs are too rich.</p>
<p><br>
</p>
<p>i am aware of the lift-a--piston method of tuning the carbs.</p>
<p><br>
</p>
<p>i am wondering if it is worth getting a gunson tuning setup or what is t=
he best method for ensuring the carbs are correctly tuned.</p>
<p><br>
</p>
<p>i know i need to ascertain the valve gap and timing first.</p>
</div>
</div>

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