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Hi Andrew,
If you have fuel pressure, it almost sounds like a coil getting hot and fai=
ling. =C2=A0Working again when it cools off. =C2=A0 What are you running fo=
r ignition? =C2=A0I=E2=80=99ve also had a pertronix do the same thing=E2=80=
=A6
A wise man once told me 90% of carb problems are ignition (and vice versa).=
Haha. =C2=A0You know who you are=E2=80=A6=C2=A0 I could we way off base=E2=
=80=A6.
Dave Gott
Sent from Yahoo Mail for iPhone
On Friday, August 9, 2024, 2:52 PM, Andrew Devenish via Fot <fot@autox.team=
.net> wrote:
Guys,=20
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 My car ( 1300, 12.5:1 comp on Sunoco 110=
race gas, dual HS4 ) is still giving me grief. I=E2=80=99ve chased all the=
things I can think of, but still same problem. It starts and runs great, b=
ut after a few laps of the yard ( 5-6, only 1000ft=C2=A0 or so per up/down =
lap, so quick accels then braking to turn ) it goes very lean ( I have O2 s=
ensor ) and stops. I=E2=80=99m running it without the hood for these test r=
uns. It always stops at the entry to a turn.=20
=C2=A0 =C2=A0 =C2=A0 =C2=A0 I=E2=80=99ve been working on it a lot, so know =
it has fuel pressure, and the float bowls are full of fuel. All plugs look =
very similar. The needles (AAA) are the spring type, and the slides move fr=
eely. I use ATF as fluid, but have tried 50 weight too.
=C2=A0 =C2=A0 =C2=A0 =C2=A0 After a minute or so it will fire back up, but =
only run enough to get back to the shop before going lean again. If I pull =
out the choke it will run, but is unstable.=20
=C2=A0 =C2=A0 =C2=A0 I have wrapped headers and a heat shield around the ca=
rbs but they do still get hot.
=C2=A0 =C2=A0 =C2=A0 Any ideas ?=C2=A0 Thinking to try some less volatile f=
uel as it seems heat related and the Sunoco evaporates so fast !
=C2=A0 =C2=A0=20
Thank you,=20
=C2=A0 =C2=A0 =C2=A0 Andrew Devenish
Sent from my iPad_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
hoo.com
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<html xmlns=3D"http://www.w3.org/1999/xhtml"; xmlns:v=3D"urn:schemas-microso=
ft-com:vml" xmlns:o=3D"urn:schemas-microsoft-com:office:office"><head><!--[=
if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>=
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dy>
Hi Andrew,<div><br></div><div><br></div><div>If you have fuel pressure, it =
almost sounds like a coil getting hot and failing. Working again when=
it cools off. What are you running for ignition? I=E2=80=99ve=
also had a pertronix do the same thing=E2=80=A6</div><div><br></div><div><=
br></div><div>A wise man once told me 90% of carb problems are ignition (an=
d vice versa). Haha. You know who you are=E2=80=A6 I could we w=
ay off base=E2=80=A6.</div><div><br></div><div>Dave Gott<br><br><br><div cl=
ass=3D"yahoo-signature"><a style=3D"font-size:12px" href=3D"https://mail.on=
elink.me/107872968?pid=3Dnativeplacement&c=3DGlobal_Acquisition_YMktg_3=
15_Internal_EmailSignature&af_sub1=3DAcquisition&af_sub2=3DGlobal_Y=
Mktg&af_sub3=3D&af_sub4=3D100000604&af_sub5=3DEmailSignature__S=
tatic_">Sent from Yahoo Mail for iPhone</a><br></div><br><p class=3D"yahoo-=
quoted-begin" style=3D"font-size: 15px; color: rgb(132, 115, 255); padding-=
top: 15px; margin-top: 0px;">On Friday, August 9, 2024, 2:52 PM, Andrew Dev=
enish via Fot <fot@autox.team.net> wrote:</p><blockquote class=3D"ios=
ymail"><div dir=3D"ltr">Guys, <br clear=3D"none">  =
; My car ( 1300, 12.5:1 comp on Sunoco 110 race gas, dual HS4 ) is s=
till giving me grief. I=E2=80=99ve chased all the things I can think of, bu=
t still same problem. It starts and runs great, but after a few laps of the=
yard ( 5-6, only 1000ft or so per up/down lap, so quick accels then =
braking to turn ) it goes very lean ( I have O2 sensor ) and stops. I=E2=80=
=99m running it without the hood for these test runs. It always stops at th=
e entry to a turn. <br clear=3D"none"> I=E2=80=
=99ve been working on it a lot, so know it has fuel pressure, and the float=
bowls are full of fuel. All plugs look very similar. The needles (AAA) are=
the spring type, and the slides move freely. I use ATF as fluid, but have =
tried 50 weight too.<br clear=3D"none"> After a =
minute or so it will fire back up, but only run enough to get back to the s=
hop before going lean again. If I pull out the choke it will run, but is un=
stable. <br clear=3D"none"> I have wrapped headers and=
a heat shield around the carbs but they do still get hot.<br clear=3D"none=
"><br clear=3D"none"> Any ideas ? Thinking to tr=
y some less volatile fuel as it seems heat related and the Sunoco evaporate=
s so fast !<br clear=3D"none"> <br clear=3D"none"><br clear=
=3D"none">Thank you, <br clear=3D"none"> Andrew Devenis=
h<br clear=3D"none"><br clear=3D"none">Sent from my iPad</div><div class=3D=
"yqt8722234662" id=3D"yqtfd09024">_________________________________________=
______<br clear=3D"none"><a shape=3D"rect" ymailto=3D"mailto:fot@autox.team=
.net" href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a><br clear=3D=
"none"><br clear=3D"none"><a shape=3D"rect" href=3D"http://www.fot-racing.c=
om" target=3D"_blank">http://www.fot-racing.com</a><br clear=3D"none"><br c=
lear=3D"none">Donate: <a shape=3D"rect" href=3D"http://www.team.net/donate.=
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te></blockquote></blockquote></div>
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_______________________________________________
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Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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