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Thanks for the several comments so far. The background for the inquiry is: =
A friend has an aftermarket fuel pump that delivers 7-10psi & a pressure re=
gulator set at 2 psi. He also has (3) HS6 carbs. The engine starts, idles &=
runs fine until he stops & turns off the engine. Like at a gas station. Th=
en upon restarting it runs rough & won't idle unless he pulls the choke par=
tially out, I.E. fast idle, not richer mixture. We assume this is due to he=
at soaking &/or peculating fuel. I thought raising the pressure might help =
if the peculating was occurring before the float valve & wanted to know the=
Max fuel pressure to this model SU. I doubt that it will have any effect. =
We are also interested in any suggestions you may have. Additional facts:hi=
s engine never gets over 190 F when running. He has an electric fan in addi=
tion to the original fan. he carbs are not running lean. I am told the timi=
ng is correct.=C2=A0
Thanks,Gary Hodson=C2=A0
-----Original Message-----
From: Michael Oritt <michael.oritt@gmail.com>
To: warthodson@aol.com; Austin Healey <healeys@autox.team.net>
Sent: Sun, Jun 14, 2020 12:45 pm
Subject: Re: [Healeys] SU carb fuel pressure
Gary--
2 to 4 psi is the common wisdom.=C2=A0=C2=A0
That said, I had a set of HS6's on the MGA engine in my (now-gone) Elva Cou=
rier and=C2=A0no amount of fiddling with floats, lid position, etc. would s=
olve a consistent fuel starvation problem when coming of=C2=A0hard, tight r=
ight-handers under full throttle as in turns 1 at VIR, Summit Point, etc.=
=C2=A0 =C2=A0I finally solved the=C2=A0problem by installing=C2=A0a Holly B=
lue (high-pressure fuel pump) and reducing pressure via a regulator to abou=
t 5.5-6 psi.=C2=A0 Dire predictions notwithstanding I never had an issue=C2=
=A0 with the floats' being overcome by that pressure and causing leaking.=
=C2=A0=C2=A0
I'm not saying anyone should go to such extremes without a good reason but =
I think the "common wisdom" is just=C2=A0that and not always gospel.=C2=A0=
=C2=A0
Best--Michael Oritt
On Sun, Jun 14, 2020 at 12:27 PM warthodson--- via Healeys <healeys@autox.t=
eam.net> wrote:
What is the Max recommended fuel pressure (psi) for SU HS 6=C2=A0 Carbs. Is=
there=C2=A0 also a Min fuel pressure?Gary Hodson__________________________=
_____________________
Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archiv=
e
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
ritt@gmail.com
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<div style="color:black;font: 12pt Comic Sans MS, sans-serif;">Thanks for the
several comments so far. The background for the inquiry is: A friend has an
aftermarket fuel pump that delivers 7-10psi & a pressure regulator set at 2
psi. He also has (3) HS6 carbs. The engine starts, idles & runs fine until
he stops & turns off the engine. Like at a gas station. Then upon
restarting it runs rough & won't idle unless he pulls the choke partially
out, I.E. fast idle, not richer mixture. We assume this is due to heat soaking
&/or peculating fuel. I thought raising the pressure might help if the
peculating was occurring before the float valve & wanted to know the Max
fuel pressure to this model SU. I doubt that it will have any effect. We are
also interested in any suggestions you may have. Additional facts:
<div>his engine never gets over 190 F when running. He has an electric fan in
addition to the original fan. he carbs are not running lean. I am told the
timing is correct. </div>
<div><br>
</div>
<div>Thanks,</div>
<div>Gary Hodson <br>
<div><br>
<br>
<br>
<div
style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original
Message-----<br>
From: Michael Oritt <michael.oritt@gmail.com><br>
To: warthodson@aol.com; Austin Healey <healeys@autox.team.net><br>
Sent: Sun, Jun 14, 2020 12:45 pm<br>
Subject: Re: [Healeys] SU carb fuel pressure<br>
<br>
<div id="yiv6584258867">
<div>
<div dir="ltr">
<div class="yiv6584258867gmail_default" style="color:#3333ff;">Gary--</div>
<div class="yiv6584258867gmail_default" style="color:#3333ff;"><br
clear="none"></div>
<div class="yiv6584258867gmail_default" style="color:#3333ff;">2 to 4 psi is
the common wisdom. </div>
<div class="yiv6584258867gmail_default" style="color:#3333ff;"><br
clear="none"></div>
<div class="yiv6584258867gmail_default" style="color:#3333ff;">That said, I had
a set of HS6's on the MGA engine in my (now-gone) Elva Courier and no
amount of fiddling with floats, lid position, etc. would solve a consistent
fuel starvation problem when coming of hard, tight right-handers under
full throttle as in turns 1 at VIR, Summit Point, etc. I finally
solved the problem by installing a Holly Blue (high-pressure fuel
pump) and reducing pressure via a regulator to about 5.5-6 psi. Dire
predictions notwithstanding I never had an issue with the floats' being
overcome by that pressure and causing leaking. </div>
<div class="yiv6584258867gmail_default" style="color:#3333ff;"><br
clear="none"></div>
<div class="yiv6584258867gmail_default" style="color:#3333ff;">I'm not saying
anyone should go to such extremes without a good reason but I think the "common
wisdom" is just that and not always gospel. </div>
<div class="yiv6584258867gmail_default" style="color:#3333ff;"><br
clear="none"></div>
<div class="yiv6584258867gmail_default" style="color:#3333ff;">Best--Michael
Oritt</div>
</div>
<br clear="none">
<div class="yiv6584258867gmail_quote">
<div class="yiv6584258867yqt2866647271" id="yiv6584258867yqt75414">
<div class="yiv6584258867gmail_attr" dir="ltr">On Sun, Jun 14, 2020 at 12:27 PM
warthodson--- via Healeys <<a rel="nofollow" shape="rect"
ymailto="mailto:healeys@autox.team.net"; target="_blank"
href="mailto:healeys@autox.team.net";>healeys@autox.team.net</a>> wrote:<br
clear="none"></div>
<blockquote class="yiv6584258867gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div style="color:black;font:12pt Sans sans-serif;">What is the Max recommended
fuel pressure (psi) for SU HS 6 Carbs. Is there also a Min fuel
pressure?
<div>Gary Hodson</div>
</div>
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<a rel="nofollow" shape="rect" ymailto="mailto:Healeys@autox.team.net";
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</div>
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</div>
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