Re: [Healeys] SU carb fuel pressure

[Michael Oritt <michael.oritt@gmail.com>]

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Gary--

2 to 4 psi is the common wisdom.

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.

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.

Best--Michael Oritt

On Sun, Jun 14, 2020 at 12:27 PM warthodson--- via Healeys <
healeys@autox.team.net> wrote:

> What is the Max recommended fuel pressure (psi) for SU HS 6  Carbs. Is
> there  also a Min fuel pressure?
> Gary Hodson
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">Gary-=
-</div><div class=3D"gmail_default" style=3D"color:#3333ff"><br></div><div =
class=3D"gmail_default" style=3D"color:#3333ff">2 to 4 psi is the common wi=
sdom.=C2=A0=C2=A0</div><div class=3D"gmail_default" style=3D"color:#3333ff"=
><br></div><div class=3D"gmail_default" style=3D"color:#3333ff">That said, =
I had a set of HS6&#39;s on the MGA engine in my (now-gone) Elva Courier an=
d=C2=A0no amount of fiddling with floats, lid position, etc. would solve a =
consistent fuel starvation problem when coming of=C2=A0hard, tight right-ha=
nders 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 Blue (hi=
gh-pressure fuel pump) and reducing pressure via a regulator to about 5.5-6=
 psi.=C2=A0 Dire predictions notwithstanding I never had an issue=C2=A0 wit=
h the floats&#39; being overcome by that pressure and causing leaking.=C2=
=A0=C2=A0</div><div class=3D"gmail_default" style=3D"color:#3333ff"><br></d=
iv><div class=3D"gmail_default" style=3D"color:#3333ff">I&#39;m not saying =
anyone should go to such extremes without a good reason but I think the &qu=
ot;common wisdom&quot; is just=C2=A0that and not always gospel.=C2=A0=C2=A0=
</div><div class=3D"gmail_default" style=3D"color:#3333ff"><br></div><div c=
lass=3D"gmail_default" style=3D"color:#3333ff">Best--Michael Oritt</div></d=
iv><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On =
Sun, Jun 14, 2020 at 12:27 PM warthodson--- via Healeys &lt;<a href=3D"mail=
to:healeys@autox.team.net">healeys@autox.team.net</a>&gt; wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex">
<div style=3D"color:black;font:12pt &quot;Comic Sans MS&quot;,sans-serif">W=
hat is the Max recommended fuel pressure (psi) for SU HS 6=C2=A0 Carbs. Is =
there=C2=A0 also a Min fuel pressure?
<div>Gary Hodson</div>
</div>
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