Subject: [TR] Issues with Temp. compensators on a ZS CD 175

From: Sujit Roy <[email-masked]>
Date: Tue, 18 Jan 2022 09:19:13 -0800

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I've been running into issues with my ZS carbs. The problem is as the car
gets to operating conditions, the RPMs goes up from about 800 rpm  to about
1000.
I have carbs with by-pass valves, but they are blocked off.
Folk have said it's the temp. compensators. I rebuilt the carbs and have
adjusted the compensators according to an article on Buckeye Triumph.
Suggestions have been to tighten the adjustment screw so they don't open.

So I have just read the Dealer Training on the subject of Carburetion. I
see how the compensators work and make the fuel mixture leaner when at
operating temperature. The doc says when they open, it weakens the
depression which allows the piston to fall slightly thereby cutting the
available fuel and creating a leaner mixture. This I get, but with the
throttle plate in the idle position, and the volume of air passing the
throttle plate can't change, then why does the engine speed increase?

Regards, Sujit

-- 
Sujit Roy
Cupertino, California

https://triumphstagblog.wordpress.com/

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<div dir=3D"ltr">I&#39;ve been running=C2=A0into issues with my ZS carbs. T=
he problem is as the car gets to operating conditions, the=C2=A0RPMs goes u=
p from about 800 rpm=C2=A0 to about 1000.=C2=A0<div>I have carbs with by-pa=
ss valves, but they are blocked off.</div><div>Folk have said it&#39;s the =
temp. compensators. I rebuilt the carbs and have adjusted the=C2=A0compensa=
tors according=C2=A0to an article on Buckeye Triumph. Suggestions have been=
 to tighten the adjustment screw so they don&#39;t=C2=A0open.=C2=A0</div><d=
iv><br></div><div>So <span style=3D"color:rgb(17,17,17);font-family:Arial,H=
elvetica,Verdana,sans-serif;font-size:12px">I have just read the Dealer Tra=
ining on the subject of Carburetion. I see how the </span>compensators work=
<span style=3D"color:rgb(17,17,17);font-family:Arial,Helvetica,Verdana,sans=
-serif;font-size:12px"> and make the fuel mixture leaner when at operating =
temperature. The doc says when they open, it weakens the depression which a=
llows the piston to fall slightly thereby cutting the available fuel and cr=
eating a leaner mixture. This I get, but with the throttle plate in the idl=
e position, and the volume of air passing the throttle plate can&#39;t chan=
ge, then why does the engine speed increase?</span></div><div><span style=
=3D"color:rgb(17,17,17);font-family:Arial,Helvetica,Verdana,sans-serif;font=
-size:12px"><br></span></div><div><br></div><div><font color=3D"#111111" fa=
ce=3D"Arial, Helvetica, Verdana, sans-serif"><span style=3D"font-size:12px"=
>Regards, Sujit</span></font></div><div><font color=3D"#111111" face=3D"Ari=
al, Helvetica, Verdana, sans-serif"><span style=3D"font-size:12px"><br></sp=
an></font><div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" data-smart=
mail=3D"gmail_signature"><div dir=3D"ltr"><div>Sujit Roy<br>Cupertino, Cali=
fornia</div><div><br><a href=3D"https://triumphstagblog.wordpress.com/" tar=
get=3D"_blank">https://triumphstagblog.wordpress.com/</a><br><br></div></di=
v></div></div></div></div>

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