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

[DAVID MASSEY <dave1massey@cs.com>]

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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 <triumphstag@gmail.com>
To: Triumphs <triumphs@autox.team.net>
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/

** triumphs@autox.team.net **

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sey@cs.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;triumphstag@gmail.com&gt;<br>
To: Triumphs &lt;triumphs@autox.team.net&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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