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Sujit,
Having boiled my temperature compensators and trying to get them perfect I w=
ent down that rabbit hole for quite some time.=20
I found that the same problem you have actually was caused by too high fuel p=
ressure.=20
My problem went away when I installed a fuel pressure regulator in the gas l=
ine between the fuel pump and the carbs . I hooked up a vacuum/ fuel pressur=
e gage simultaneously and set the fuel pressure to 1.5-2 psi. Basically ZS c=
arbs will flood just a wee bit by the float valve not being able to hold bac=
k fuel any higher pressure than that. Hence higher RPMs once warm with the e=
xtra fuel.
One indicator of this is a Triumph that needs little or no choke to start up=
when cold. These cars were designed to be choked on most.
Bud
Sent from my Commadore 64
> On Jan 18, 2022, at 10:20 AM, Sujit Roy <triumphstag@gmail.com> wrote:
>=20
> =EF=BB=BF
> I've been running into issues with my ZS carbs. The problem is as the car g=
ets to operating conditions, the RPMs goes up from about 800 rpm to about 1=
000.=20
> 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 a=
djusted the compensators according to an article on Buckeye Triumph. Suggest=
ions have been to tighten the adjustment screw so they don't open.=20
>=20
> So I have just read the Dealer Training on the subject of Carburetion. I s=
ee how the compensators work and make the fuel mixture leaner when at operat=
ing temperature. The doc says when they open, it weakens the depression whic=
h allows the piston to fall slightly thereby cutting the available fuel and c=
reating 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't change, t=
hen why does the engine speed increase?
>=20
>=20
> Regards, Sujit
>=20
> --=20
> Sujit Roy
> Cupertino, California
>=20
> https://triumphstagblog.wordpress.com/
>=20
> ** triumphs@autox.team.net **
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archi=
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>=20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Sujit,<div>Having boiled my temperature com=
pensators and trying to get them perfect I went down that rabbit hole for qu=
ite some time. </div><div>I found that the same problem you have actual=
ly was caused by too high fuel pressure. </div><div>My problem went awa=
y when I installed a fuel pressure regulator in the gas line between the fue=
l pump and the carbs . I hooked up a vacuum/ fuel pressure gage simultaneous=
ly and set the fuel pressure to 1.5-2 psi. Basically ZS carbs will flood jus=
t a wee bit by the float valve not being able to hold back fuel any higher p=
ressure than that. Hence higher RPMs once warm with the extra fuel.</d=
iv><div>One indicator of this is a Triumph that needs little or no choke to s=
tart up when cold. These cars were designed to be choked on most.</div><div>=
<br></div><div>Bud<br><br><div dir=3D"ltr">Sent from my Commadore 64</div><d=
iv dir=3D"ltr"><br><blockquote type=3D"cite">On Jan 18, 2022, at 10:20 AM, S=
ujit Roy <triumphstag@gmail.com> wrote:<br><br></blockquote></div><blo=
ckquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div dir=3D"ltr">I've been r=
unning into issues with my ZS carbs. The problem is as the car gets to o=
perating conditions, the RPMs goes up from about 800 rpm to about=
1000. <div>I have carbs with by-pass valves, but they are blocked off.=
</div><div>Folk have said it's the temp. compensators. I rebuilt the carbs a=
nd have adjusted the compensators according to an article on Bucke=
ye Triumph. Suggestions have been to tighten the adjustment screw so they do=
n't open. </div><div><br></div><div>So <span style=3D"color:rgb(17=
,17,17);font-family:Arial,Helvetica,Verdana,sans-serif;font-size:12px">I hav=
e just read the Dealer Training on the subject of Carburetion. I see how the=
</span>compensators work<span style=3D"color:rgb(17,17,17);font-family:Aria=
l,Helvetica,Verdana,sans-serif;font-size:12px"> and make the fuel mixture le=
aner when at operating temperature. The doc says when they open, it weakens t=
he depression which allows the piston to fall slightly thereby cutting the a=
vailable fuel and creating a leaner mixture. This I get, but with the thrott=
le plate in the idle position, and the volume of air passing the throttle pl=
ate can't change, 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"#1=
11111" face=3D"Arial, Helvetica, Verdana, sans-serif"><span style=3D"font-si=
ze:12px">Regards, Sujit</span></font></div><div><font color=3D"#111111" face=
=3D"Arial, Helvetica, Verdana, sans-serif"><span style=3D"font-size:12px"><b=
r></span></font><div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" data-=
smartmail=3D"gmail_signature"><div dir=3D"ltr"><div>Sujit Roy<br>Cupertino, C=
alifornia</div><div><br><a href=3D"https://triumphstagblog.wordpress.com/"; t=
arget=3D"_blank">https://triumphstagblog.wordpress.com/</a><br><br></div></d=
iv></div></div></div></div>
<span>** triumphs@autox.team.net **</span><br><span></span><br><span>Donate:=
http://www.team.net/donate.html</span><br><span>Archive: http://www.team.ne=
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hs/levilevi@comcast.net</span><br></div></blockquote></div></body></html>=
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