Subject: Re: [TR] Mixture - Check and Adjust ZS 175 carbs

From: DAVID MASSEY <[email-masked]>
Date: Fri, 17 Dec 2021 18:20:19 +0000 (UTC)

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 Is that for domestic cars or just European cars?=C2=A0 This is the techniq=
ue used for decades for SU's but they had a piston lifting button that woul=
d lift the piston the prescribed amount.=C2=A0 The reason it worked is that=
 the needle was profiled to run rich at idle and lifting the piston would l=
ean it out.=C2=A0 When set right you will get a momentary increase in speed=
.
When US Emissions standards wet in running rich at idle was no longer an op=
tion.=C2=A0 The needles were profiled to run lean at idle to meet the CO an=
d HC levels prescribed by the EPA.=C2=A0 Lifting the piston on such a car w=
ill have no effect or will just cause it to slow down.=C2=A0=20

The only accurate way to set the jets is with am exhaust gas analyzer.
=20
Dave=20

=20
=20
-----Original Message-----
From: Sujit Roy <[email-masked]>
To: Triumphs <[email-masked]>
Sent: Fri, Dec 17, 2021 11:32 am
Subject: [TR] Mixture - Check and Adjust ZS 175 carbs

The ROM for the Stag says to lift each air valve by 0.8mm and note the reac=
tion of the engine. Is 0.8mm really enough? I can't make out any difference=
. My carbs needles are set to max lean. The car revs, in neutral, well with=
out hesitation.The Stag uses the same ZS CD 175 as the TR6 I'm assuming the=
 tuning=C2=A0is the same.=C2=A0
Sujit

--=20
Sujit Roy
Cupertino, California
https://triumphstagblog.wordpress.com/

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<div style="color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size="3">Is that for domestic cars or just European cars?&nbsp; This is the technique used for decades for SU's but they had a piston lifting button that would lift the piston the prescribed amount.&nbsp; The reason it worked is that the needle was profiled to run rich at idle and lifting the piston would lean it out.&nbsp; When set right you will get a momentary increase in speed.</font></div>

<div><br>
</div>

<div><font size="3">When US Emissions standards wet in running rich at idle was no longer an option.&nbsp; The needles were profiled to run lean at idle to meet the CO and HC levels prescribed by the EPA.&nbsp; Lifting the piston on such a car will have no effect or will just cause it to slow down.&nbsp; <br>
</font></div>

<div><font size="3"><br>
</font></div>

<div><font size="3">The only accurate way to set the jets is with am exhaust gas analyzer.</font><br>
</div>

<div> <br>
</div>

<div style="clear:both"><font size="4">Dave </font><br>
<br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font size="2">-----Original Message-----<br>
From: Sujit Roy &lt;[email-masked]&gt;<br>
To: Triumphs &lt;[email-masked]&gt;<br>
Sent: Fri, Dec 17, 2021 11:32 am<br>
Subject: [TR] Mixture - Check and Adjust ZS 175 carbs<br>
<br>

<div id="yiv0280622868">
<div dir="ltr">
<div><br>
</div>
The ROM for the Stag says to lift each air valve by 0.8mm and note the reaction of the engine. Is 0.8mm really enough? I can't make out any difference. My carbs needles are set to max lean. The car revs, in neutral, well without hesitation.
<div>The Stag uses the same ZS CD 175 as the TR6 I'm assuming the tuning&nbsp;is the same.&nbsp;<br>
Sujit<br clear="all">
<div><br>
</div>
-- <br>

<div dir="ltr" class="yiv0280622868gmail_signature">
<div dir="ltr">
<div>Sujit Roy<br>
Cupertino, California</div>

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<a rel="nofollow noopener noreferrer" target="_blank" href="https://triumphstagblog.wordpress.com/">https://triumphstagblog.wordpress.com/</a><br>
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From: Sujit Roy <[email-masked]>
Date: Fri, 17 Dec 2021 10:45:01 -0800

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The ROM say the engine RPM should raise and then settle down if it is
running right. 0.8mm is som small. WIll I notice anything. The carbs have
been rebuilt, but needles are 50 years old.
I can check the plugs but I'm assuming after a few test runs. The carbs are
for a FED Stag.

Sujit

On Fri, Dec 17, 2021 at 10:20 AM DAVID MASSEY <[email-masked]> wrote:

> Is that for domestic cars or just European cars?  This is the technique
> used for decades for SU's but they had a piston lifting button that would
> lift the piston the prescribed amount.  The reason it worked is that the
> needle was profiled to run rich at idle and lifting the piston would lean
> it out.  When set right you will get a momentary increase in speed.
>
> When US Emissions standards wet in running rich at idle was no longer an
> option.  The needles were profiled to run lean at idle to meet the CO and
> HC levels prescribed by the EPA.  Lifting the piston on such a car will
> have no effect or will just cause it to slow down.
>
> Dave
> The ROM for the Stag says to lift each air valve by 0.8mm and note the
> reaction of the engine. Is 0.8mm really enough? I can't make out any
> difference. My carbs needles are set to max lean. The car revs, in neutral,
> well without hesitation.
> The Stag uses the same ZS CD 175 as the TR6 I'm assuming the tuning is the
> same.
> Sujit
>
> --
> Sujit Roy
> Cupertino, California
>
> Donate: http://www.team.net/donate.html
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/triumphs/[email-masked]
>

-- 
Sujit Roy
Cupertino, California

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<div dir=3D"ltr">The ROM=C2=A0say the engine RPM should raise and then sett=
le down if it is running right. 0.8mm is som small. WIll I notice anything.=
=C2=A0The carbs=C2=A0have been rebuilt, but needles are 50 years old.=C2=A0=
<div>I can check the plugs but I&#39;m assuming=C2=A0after a few test runs.=
 The carbs are for a FED Stag.</div><div><br></div><div>Sujit</div></div><b=
r><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, =
Dec 17, 2021 at 10:20 AM DAVID MASSEY &lt;<a href=3D"mailto:dave1massey@cs.=
com">[email-masked]</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 style=3D"color:black;font:12pt Arial,Helvetica,sans-serif">
<div> <font size=3D"3">Is that for domestic cars or just European cars?=C2=
=A0 This is the technique used for decades for SU&#39;s but they had a pist=
on lifting button that would lift the piston the prescribed amount.=C2=A0 T=
he reason it worked is that the needle was profiled to run rich at idle and=
 lifting the piston would lean it out.=C2=A0 When set right you will get a =
momentary increase in speed.</font></div>

<div><br>
</div>

<div><font size=3D"3">When US Emissions standards wet in running rich at id=
le was no longer an option.=C2=A0 The needles were profiled to run lean at =
idle to meet the CO and HC levels prescribed by the EPA.=C2=A0 Lifting the =
piston on such a car will have no effect or will just cause it to slow down=
.=C2=A0 <br>
</font></div>

<div><font size=3D"3"><br>
</font></div>

<div><font size=3D"3">The only accurate way to set the jets is with am exha=
ust gas analyzer.</font><br>
</div>

<div> <br>
</div>

<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><font=
 size=3D"2">-----Original Message-----<br>
From: Sujit Roy &lt;<a href=3D"mailto:[email-masked]" target=3D"_bla=
nk">[email-masked]</a>&gt;<br>
To: Triumphs &lt;<a href=3D"mailto:[email-masked]" target=3D"_blan=
k">[email-masked]</a>&gt;<br>
Sent: Fri, Dec 17, 2021 11:32 am<br>
Subject: [TR] Mixture - Check and Adjust ZS 175 carbs<br>
<br>

<div id=3D"gmail-m_-1568612459460539199yiv0280622868">
<div dir=3D"ltr">
<div><br>
</div>
The ROM for the Stag says to lift each air valve by 0.8mm and note the reac=
tion of the engine. Is 0.8mm really enough? I can&#39;t make out any differ=
ence. My carbs needles are set to max lean. The car revs, in neutral, well =
without hesitation.
<div>The Stag uses the same ZS CD 175 as the TR6 I&#39;m assuming the tunin=
g=C2=A0is the same.=C2=A0<br>
Sujit<br clear=3D"all">
<div><br>
</div>
-- <br>

<div dir=3D"ltr">
<div dir=3D"ltr">
<div>Sujit Roy<br>

<div><br>
<a rel=3D"nofollow noopener noreferrer" href=3D"https://triumphstagblog.wor=
dpress.com/" target=3D"_blank">https://triumphstagblog.wordpress.com/</a><b=
r>
<br>
</div>
</div>
</div>
</div>
</div>

</div>
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</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><div dir=3D"ltr"><div>Sujit Roy<br>Cupertino, Ca=
lifornia</div><div><br><a href=3D"https://triumphstagblog.wordpress.com/" t=
arget=3D"_blank">https://triumphstagblog.wordpress.com/</a><br><br></div></=
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