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Re: [Healeys] SU carb fuel pressure

To: Michael Oritt <michael.oritt@gmail.com>
Subject: Re: [Healeys] SU carb fuel pressure
From: richard mayor <boyracer466@gmail.com>
Date: Sun, 14 Jun 2020 13:28:09 -0700
Cc: Austin Healey <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <914181121.505574.1592151082897.ref@mail.yahoo.com> <914181121.505574.1592151082897@mail.yahoo.com> <CAPTa0B4rZp+a6u2VUtUSk5Pa+WG4Qkj_0d0xEBU6rQ4P8qHQoA@mail.gmail.com>
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Not sure if this information will help,  but I had some Sprite racer
friends that were anal about having everything look good.  So they
aligned/oriented the float chamber tops about 90 degrees away from the
factory orientation because they thought it looked better.   As I  recall,
this realignment put the float arms in line with the cars front to back
orientation. This made the floats and float arms react by pivoting in
response to hard braking and/or acceleration and either causing fuel
starvation or flooding.  I don't recall which.  My point being that
apparently float arm orientation can cause some issues.


On Sun, Jun 14, 2020 at 10:46 AM Michael Oritt <michael.oritt@gmail.com>
wrote:

> 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>Not sure if this information will help,=C2=A0 but I h=
ad some Sprite racer friends that were anal about having everything look go=
od.=C2=A0 So they aligned/oriented the float chamber tops about 90 degrees =
away from the factory orientation because they thought it looked better.=C2=
=A0=C2=A0 As I=C2=A0 recall,=C2=A0 this realignment put the float arms in l=
ine with the cars front to back orientation. This made the floats and float=
 arms react by pivoting in response to hard braking and/or acceleration and=
 either causing fuel starvation or flooding.=C2=A0 I don&#39;t recall which=
.=C2=A0 My point being that apparently float arm orientation can cause some=
 issues.</div><div><br></div><div> </div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Jun 14, 2020 at 10:46 AM M=
ichael Oritt &lt;<a href=3D"mailto:michael.oritt@gmail.com";>michael.oritt@g=
mail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:rgb(51=
,51,255)">Gary--</div><div class=3D"gmail_default" style=3D"color:rgb(51,51=
,255)"><br></div><div class=3D"gmail_default" style=3D"color:rgb(51,51,255)=
">2 to 4 psi is the common wisdom.=C2=A0=C2=A0</div><div class=3D"gmail_def=
ault" style=3D"color:rgb(51,51,255)"><br></div><div class=3D"gmail_default"=
 style=3D"color:rgb(51,51,255)">That said, I had a set of HS6&#39;s on the =
MGA engine in my (now-gone) Elva Courier and=C2=A0no amount of fiddling wit=
h floats, lid position, etc. would solve a consistent fuel starvation probl=
em when coming of=C2=A0hard, tight right-handers under full throttle as in =
turns 1 at VIR, Summit Point, etc.=C2=A0 =C2=A0I finally solved the=C2=A0pr=
oblem by installing=C2=A0a Holly Blue (high-pressure fuel pump) and reducin=
g pressure via a regulator to about 5.5-6 psi.=C2=A0 Dire predictions notwi=
thstanding I never had an issue=C2=A0 with the floats&#39; being overcome b=
y that pressure and causing leaking.=C2=A0=C2=A0</div><div class=3D"gmail_d=
efault" style=3D"color:rgb(51,51,255)"><br></div><div class=3D"gmail_defaul=
t" style=3D"color:rgb(51,51,255)">I&#39;m not saying anyone should go to su=
ch extremes without a good reason but I think the &quot;common wisdom&quot;=
 is just=C2=A0that and not always gospel.=C2=A0=C2=A0</div><div class=3D"gm=
ail_default" style=3D"color:rgb(51,51,255)"><br></div><div class=3D"gmail_d=
efault" style=3D"color:rgb(51,51,255)">Best--Michael Oritt</div></div><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"mailto:heale=
ys@autox.team.net" target=3D"_blank">healeys@autox.team.net</a>&gt; wrote:<=
br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left: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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