Re: [Healeys] HS4 Tri-carb tuning

[warthodson--- via Healeys <healeys@autox.team.net>]

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I just performed the piston lift pin test on my tri-carbs. FYI, I have 3 SU=
 HS6 carbs & an mid-aggressive cam. I cannot recall the specs. About a 9.5:=
1 compression & run premium pump gas. To keep my engine running (idling) at=
 stop lights I need to set the idle at 1000rpm. It will drop to 600-800rpm =
when I depress the clutch.It is 93degrees here today when I performed the l=
ift test. All three carbs performed similarly. With the piston lifted the r=
pm dropped & the engine ran rougher but did not die. But each time it was o=
n the verge of dying. After releasing the lift pin the rpm did not return t=
o 1000, until I cleared the carbs by revving the engine. My carbs have a st=
ock balance pipe. I understand that there were 2 different original balance=
 pipes. I believe mine is the later style.I hope this is some help.Gary


-----Original Message-----
From: John Spaur <jmsdarch@sbcglobal.net>
To: warthodson@aol.com
Sent: Tue, Jul 7, 2020 11:51 am
Subject: RE: [Healeys] HS4 Tri-carb tuning

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57757009WordSection1 {}#yiv5757757009 Gary, =C2=A0You understand my questio=
n! J Yes, disconnected the linkages and tuned them by the book. They are wo=
rking great although I have not taken the car on a long drive or connected =
the choke cables yet. With the tuning kit I can easily see that the pistons=
 rise equally at different throttle settings. Incidentally, the jet nut set=
tings on each carb are almost identical to what the old ones were. =C2=A0Le=
t me know what you find out when you test the pins on your carb. It would b=
e very helpful. =C2=A0TIA,John Spaur =C2=A0From: Healeys [mailto:healeys-bo=
unces@autox.team.net] On Behalf Of warthodson--- via Healeys
Sent: Tuesday, July 7, 2020 7:27 AM
To: healeys@autox.team.net
Subject: Re: [Healeys] HS4 Tri-carb tuning =C2=A0John, Are all 3 carb inter=
connecting throttle linkages disconnected during all the tuning steps?=C2=
=A0I have never seen this test before in any literature, so I have never tr=
ied the test on my tri-carb setup. I will give it a try later today & let y=
ou know what I find.If your 3 carbs all perform the same on all the other t=
ests, I think they will perform correctly together. I am assuming you have =
confirmed that all 3 carbs have the same needle. Also, when you say the "pi=
ston is lifted all the way up" you are referring to lifting the piston by t=
he pin, (approximately 1/2" pin travel), not by literally lifting the pisto=
n all the way up.Gary Hodson



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<div style="color:black;font: 12pt Comic Sans MS, sans-serif;">I just performed 
the piston lift pin test on my tri-carbs. FYI, I have 3 SU HS6 carbs &amp; an 
mid-aggressive cam. I cannot recall the specs. About a 9.5:1 compression &amp; 
run premium pump gas. To keep my engine running (idling) at stop lights I need 
to set the idle at 1000rpm. It will drop to 600-800rpm when I depress the 
clutch.
<div>It is 93degrees here today when I performed the lift test. All three carbs 
performed similarly. With the piston lifted the rpm dropped &amp; the engine 
ran rougher but did not die. But each time it was on the verge of dying. After 
releasing the lift pin the rpm did not return to 1000, until I cleared the 
carbs by revving the engine. My carbs have a stock balance pipe. I understand 
that there were 2 different original balance pipes. I believe mine is the later 
style.</div>

<div>I hope this is some help.</div>

<div>Gary<br>
<br>
<br>

<div 
style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original 
Message-----<br>
From: John Spaur &lt;jmsdarch@sbcglobal.net&gt;<br>
To: warthodson@aol.com<br>
Sent: Tue, Jul 7, 2020 11:51 am<br>
Subject: RE: [Healeys] HS4 Tri-carb tuning<br>
<br>

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<div class="yiv5757757009MsoNormal"><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;">Gary,</span></div>

<div class="yiv5757757009MsoNormal"><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;"> 
&nbsp;</span></div>

<div class="yiv5757757009MsoNormal"><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;">You understand 
my question! </span><span 
style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;">J</span><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;"> Yes, 
disconnected the linkages and tuned them by the book. They are working great 
although I have not taken the car on a long drive or connected the choke cables 
yet. With the tuning kit I can easily see that the pistons rise equally at 
different throttle settings. Incidentally, the jet nut settings on each carb 
are almost identical to what the old ones were.</span></div>

<div class="yiv5757757009MsoNormal"><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;"> 
&nbsp;</span></div>

<div class="yiv5757757009MsoNormal"><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;">Let me know what 
you find out when you test the pins on your carb. It would be very 
helpful.</span></div>

<div class="yiv5757757009MsoNormal"><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;"> 
&nbsp;</span></div>

<div class="yiv5757757009MsoNormal"><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;">TIA,</span></div>

<div class="yiv5757757009MsoNormal"><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;">John 
Spaur</span></div>

<div class="yiv5757757009MsoNormal"><span 
style="font-size:11.0pt;font-family:sans-serif;color:#1F497D;"> 
&nbsp;</span></div>

<div class="yiv5757757009yqt3141372578" id="yiv5757757009yqt64379">
<div class="yiv5757757009MsoNormal"><b><span 
style="font-size:11.0pt;font-family:sans-serif;">From:</span></b><span 
style="font-size:11.0pt;font-family:sans-serif;"> Healeys 
[mailto:healeys-bounces@autox.team.net] <b>On Behalf Of </b>warthodson--- via 
Healeys<br clear="none"><b>Sent:</b> Tuesday, July 7, 2020 7:27 AM<br 
clear="none"><b>To:</b> healeys@autox.team.net<br clear="none"><b>Subject:</b> 
Re: [Healeys] HS4 Tri-carb tuning</span></div>

<div class="yiv5757757009MsoNormal"> &nbsp;</div>

<div>
<div class="yiv5757757009MsoNormal"><span 
style="font-family:Sans;color:black;">John, </span></div>

<div>
<div class="yiv5757757009MsoNormal"><span 
style="font-family:Sans;color:black;">Are all 3 carb interconnecting throttle 
linkages disconnected during all the tuning steps?&nbsp;</span></div>
</div>

<div>
<div class="yiv5757757009MsoNormal"><span 
style="font-family:Sans;color:black;">I have never seen this test before in any 
literature, so I have never tried the test on my tri-carb setup. I will give it 
a try later today &amp; let you know what I find.</span></div>
</div>

<div>
<div class="yiv5757757009MsoNormal"><span 
style="font-family:Sans;color:black;">If your 3 carbs all perform the same on 
all the other tests, I think they will perform correctly together. I am 
assuming you have confirmed that all 3 carbs have the same needle. Also, when 
you say the "piston is lifted all the way up" you are referring to lifting the 
piston by the pin, (approximately 1/2" pin travel), not by literally lifting 
the piston all the way up.</span></div>
</div>

<div>
<div class="yiv5757757009MsoNormal" style="margin-bottom:12.0pt;"><span 
style="font-family:Sans;color:black;">Gary Hodson<br clear="none"><br 
clear="none"></span></div>

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