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Hi Larry,
Very helpful info. I believe for the 3000 six cylinder cars the output is 18=
U.S. gallons versus 15 for the 100-6 six cylinder and the 4 cylinder cars. I=
am both curious and lazy: what is the math to covert the 18 gallon figure t=
o pounds of pressure?
Thanks_
Lin
Sent from my iPad
> On Nov 28, 2018, at 5:05 PM, Larry Varley <varley@cosmos.net.au> wrote:
>=20
> Hi Group. Something worth considering when dealing with SU carburetors and=
fuel pumps. I have been doing some investigation and testing the effects of=
fuel pressure on SU carburetors. The image attached is the correct specific=
ation for SU fuel pumps for the brass float version carbs. The SU HP pump is=
quoted as 48 inch( petrol ) lift which is about 1.5 PSI. This document is f=
rom a 1950=E2=80=99s workshop manual. I have tested one of my cars and the S=
U pump sold by all of the usual suppliers has a petrol lift of over 10 feet.=
I estimate at least 2.5 PSI. I had my brother test his Healey 100 also and t=
he same result. The test was conducted attaching a clear plastic line from t=
he fuel supply line up in the air to show the lift. We have both fitted pres=
sure regulators and using the clear tube method set the pressure to 48 inche=
s ( 1.5 PSI ). The result in both cars that have wide band oxygen sensors fi=
tted is an immediate improvement in air fuel ratio at idle, moving away from=
overly rich mixture. Both cars maintain a far better and regular idle as th=
ey are no longer running rich at idle. I believe that the carbs are barely a=
ble to maintain a constant fuel level in the float bowls when the pressure i=
s 2.5 PSI and that pressure pushes the fuel level up in the bowls when the e=
ngine is not consuming much fuel. At all other speeds both engines fine with=
good air fuel ratio at 1.5 PSI fuel pressure.
> Regards
> Larry Varley
> <20181008_133235.jpg>
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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">Hi Larry,<div>Very helpful info. I believe f=
or the 3000 six cylinder cars the output is 18 U.S. gallons versus 15 for th=
e 100-6 six cylinder and the 4 cylinder cars. I am both curious and lazy: wh=
at is the math to covert the 18 gallon figure to pounds of pressure?</div><d=
iv>Thanks_</div><div>Lin<br><br><div id=3D"AppleMailSignature" dir=3D"ltr">S=
ent from my iPad</div><div dir=3D"ltr"><br>On Nov 28, 2018, at 5:05 PM, Larr=
y Varley <<a href=3D"mailto:varley@cosmos.net.au";>varley@cosmos.net.au</a=
>> wrote:<br><br></div><blockquote type=3D"cite"><div dir=3D"ltr"><meta h=
ttp-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8"><meta name=
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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--><div class=3D"WordSection1"><p class=3D"Ms=
oNormal"><span style=3D"font-size:11.0pt;font-family:"Calibri",&qu=
ot;sans-serif";color:#1F497D">Hi Group. Something worth considering whe=
n dealing with SU carburetors and fuel pumps. I have been doing some investi=
gation and testing the effects of fuel pressure on SU carburetors. The image=
attached is the correct specification for SU fuel pumps for the brass float=
version carbs. The SU HP pump is quoted as 48 inch( petrol ) lift which is a=
bout 1.5 PSI. This document is from a 1950=E2=80=99s workshop manual. I have=
tested one of my cars and the SU pump sold by all of the usual suppliers ha=
s a petrol lift of over 10 feet. I estimate at least 2.5 PSI. I had my broth=
er test his Healey 100 also and the same result. The test was conducted atta=
ching a clear plastic line from the fuel supply line up in the air to show t=
he lift. We have both fitted pressure regulators and using the clear tube me=
thod set the pressure to 48 inches ( 1.5 PSI ). The result in both cars that=
have wide band oxygen sensors fitted is an immediate improvement in air fue=
l ratio at idle, moving away from overly rich mixture. Both cars maintain a f=
ar better and regular idle as they are no longer running rich at idle. I bel=
ieve that the carbs are barely able to maintain a constant fuel level in the=
float bowls when the pressure is 2.5 PSI and that pressure pushes the fuel l=
evel up in the bowls when the engine is not consuming much fuel. At all othe=
r speeds both engines fine with good air fuel ratio at 1.5 PSI fuel pressure=
.<o:p></o:p></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0p=
t;font-family:"Calibri","sans-serif";color:#1F497D">Rega=
rds<o:p></o:p></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.=
0pt;font-family:"Calibri","sans-serif";color:#1F497D">La=
rry Varley<o:p></o:p></span></p></div></div></blockquote><blockquote type=3D=
"cite"><div dir=3D"ltr"><20181008_133235.jpg></div></blockquote><block=
quote type=3D"cite"><div dir=3D"ltr"><span>_________________________________=
______________</span><br><span>Support <a href=3D"http://Team.Net";>Team.Net<=
/a> <a href=3D"http://www.team.net/donate.html";>http://www.team.net/donate.h=
tml</a></span><br><span>Suggested annual donation $12.75</span><br><sp=
an></span><br><span>Archive: <a href=3D"http://www.team.net/pipermail/healey=
s">http://www.team.net/pipermail/healeys</a> <a href=3D"http://autox.team.ne=
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drose@mac.com</a></span><br><span></span><br></div></blockquote></div></body=
></html>=
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