Subject: Re: [Tigers] Carb Fire Research

From: Jeffery Randall via Tigers <[email-masked]>
Date: Sat, 12 Sep 2015 08:19:47 -0400

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A phenolic spacer would help keep the heat transfer down and give a
stronger shot of fuel for performance.

On Fri, Sep 11, 2015 at 8:42 PM, Stu via Tigers <[email-masked]>
wrote:

> I've been doing some research, and found an interesting video:
>
> https://www.youtube.com/watch?v=d7AkcjnCTVU
>
> To summarize, this guy does a good experiment that proves that some
> components of normal gasoline boil at around 170F.
>
> Our engines are usually well above this, so when we stop it's safe to
> assume that the underhood temperatures spike, heating up our carbs, and
> everything else.  So there could easily be some boiling in the carb  bowl.
> And once the 170F components boil off,  the temperature rises even more.
> When trying a hot restart, new fuel is introduced to the much hotter carb
> when the pump comes back on, perhaps there could be a few moments of
> additional, perhaps more violent boiling, blowing vapor and fuel out the
> vent.
>
> Last weekend I tried recreating the problem.  Similar hot day, drove
> around the same loop, etc.  Parked and waited 10 minutes, about the same
> time as before.  I had cleaned the top of the carb, so it was obvious that
> nothing had come out when I opened the hood and looked  But listening
> closely, I thought I could hear a faint sizzling sound from somewhere
> within the carb...   I did not try a restart, since I hadn't seen this
> video at that point.
>
> Any opinions?
>
> Stu
>
> _______________________________________________
>
> [email-masked]
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
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> http://autox.team.net/mailman/options/tigers/[email-masked]
>
>
>
>

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<div dir=3D"ltr">A phenolic spacer would help=C2=A0keep the heat transfer d=
own and give a stronger shot of fuel for performance.</div><div class=3D"gm=
ail_extra"><br><div class=3D"gmail_quote">On Fri, Sep 11, 2015 at 8:42 PM, =
Stu via Tigers <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]=
t" target=3D"_blank">[email-masked]</a>&gt;</span> wrote:<br><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" style=
=3D"font-size:small"><div class=3D"gmail_default" style=3D"color:rgb(0,0,0)=
;font-size:x-small">I&#39;ve been doing some research, and found an interes=
ting video:</div><div class=3D"gmail_default" style=3D"color:rgb(0,0,0);fon=
t-size:x-small"><br></div><div class=3D"gmail_default" style=3D"color:rgb(0=
,0,0);font-size:14.4px"><font size=3D"1"><a href=3D"https://www.youtube.com=
/watch?v=3Dd7AkcjnCTVU" target=3D"_blank">https://www.youtube.com/watch?v=
=3Dd7AkcjnCTVU</a></font><br></div><div class=3D"gmail_default" style=3D"co=
lor:rgb(0,0,0);font-size:14.4px"><font size=3D"1"><br></font></div><div cla=
ss=3D"gmail_default" style=3D"color:rgb(0,0,0);font-size:14.4px"><font size=
=3D"1">To summarize, this guy does a good experiment that proves that some =
components of normal gasoline boil at around 170F.</font></div><div class=
=3D"gmail_default" style=3D"color:rgb(0,0,0);font-size:14.4px"><font size=
=3D"1"><br></font></div><div class=3D"gmail_default" style=3D"color:rgb(0,0=
,0);font-size:14.4px"><font size=3D"1">Our engines are usually well above t=
his, so when we stop it&#39;s safe to assume that the underhood temperature=
s spike, heating up our carbs, and everything else.=C2=A0 So there could ea=
sily be some boiling in the carb =C2=A0bowl.=C2=A0 And once the 170F compon=
ents boil off, =C2=A0the temperature rises even more.=C2=A0 When trying a h=
ot restart, new fuel is introduced to the much hotter carb when the pump co=
mes back on, perhaps there could be a few moments of additional, perhaps mo=
re violent boiling, blowing vapor and fuel out the vent.</font></div><div c=
lass=3D"gmail_default" style=3D"color:rgb(0,0,0);font-size:14.4px"><font si=
ze=3D"1"><br></font></div><div class=3D"gmail_default" style=3D"color:rgb(0=
,0,0);font-size:14.4px"><font size=3D"1">Last weekend I tried recreating th=
e problem.=C2=A0 Similar hot day, drove around the same loop, etc.=C2=A0 Pa=
rked and waited 10 minutes, about the same time as before.=C2=A0 I had clea=
ned the top of the carb, so it was obvious that nothing had come out when I=
 opened the hood and looked =C2=A0But listening closely, I thought I could =
hear a faint sizzling sound from somewhere within the carb... =C2=A0 I did =
not try a restart, since I hadn&#39;t seen this video at that point.</font>=
</div><div class=3D"gmail_default" style=3D"color:rgb(0,0,0);font-size:14.4=
px"><font size=3D"1"><br></font></div><div class=3D"gmail_default" style=3D=
"color:rgb(0,0,0);font-size:14.4px"><font size=3D"1">Any opinions?</font></=
div><span class=3D"HOEnZb"><font color=3D"#888888"><div class=3D"gmail_defa=
ult" style=3D"color:rgb(0,0,0);font-size:14.4px"><font size=3D"1"><br></fon=
t></div><div class=3D"gmail_default" style=3D"color:rgb(0,0,0);font-size:14=
.4px"><font size=3D"1">Stu</font></div></font></span></div></div>
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<br>
<br>
<br></blockquote></div><br></div>

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---

From: Tom Witt via Tigers <[email-masked]>
Date: Tue, 15 Sep 2015 11:48:50 -0700

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I finally got around to watching this video. It was like watching paint =
dry. It could have been 30 seconds long, not 20 minutes. But anyway =
(it=E2=80=99s not Stu=E2=80=99s fault), it did eventually shows the gas =
boil at a low temperature.  I=E2=80=99ll just throw these things out =
there:

1. No one ever mentions it, but there has to be some cooling effect of =
both from the air being drawn into the carburetor and the evaporation =
effect of the gas (like when you apply rubbing alcohol to your body).  =
Then again, without cold air ducting..., maybe not.

2. A cooling effect likely offsets some of the heat soak while the car =
is in use. However, when the engine is stopped that cooling also ceases.

3. It would seem best to isolate and insulate the carburetor from the =
rest of the engine compartment.  This, however would require some type =
of hood scoop (or duct) and and an isolation enclosure under an already =
crowded hood.

4. I=E2=80=99m wondering if the horn opening block off plates some use =
(that work at idle/stopped) to prevent recirculation are a detriment at =
higher speeds not allowing cooler air to pass through the engine =
compartment?  I=E2=80=99ve always through a spring loaded door seemed a =
better concept. Closed at an idle/stopped condition, but opened from the =
flow of air as the car moved forward.

5. If anyone is interested, some of the 280Z=E2=80=99s had a fan and =
ducting that blew air onto the injector rail. The concept would seem =
somewhat adaptable to blowing cool air on the carburetor after the car =
shut off. A 555 Timer could control the run time after shut-off.

It seems any attempt for correction deviates from a stock appearance. =
And, a crowded area under the hood doesn=E2=80=99t leave many options =
for isolation or ducting. Has anyone run without their hood to see it it =
makes a difference?

Just some rambling thoughts.

From: Stu via Tigers=20
Sent: Friday, September 11, 2015 5:42 PM
To: Tiger Net=20
Subject: [Tigers] Carb Fire Research

https://www.youtube.com/watch?v=3Dd7AkcjnCTVU

To summarize, this guy does a good experiment that proves that some =
components of normal gasoline boil at around 170F.

Our engines are usually well above this, so when we stop it's safe to =
assume that the underhood temperatures spike, heating up our carbs, and =
everything else.  So there could easily be some boiling in the carb  =
bowl.  And once the 170F components boil off,  the temperature rises =
even more.  When trying a hot restart, new fuel is introduced to the =
much hotter carb when the pump comes back on, perhaps there could be a =
few moments of additional, perhaps more violent boiling, blowing vapor =
and fuel out the vent.

Last weekend I tried recreating the problem.  Similar hot day, drove =
around the same loop, etc.  Parked and waited 10 minutes, about the same =
time as before.  I had cleaned the top of the carb, so it was obvious =
that nothing had come out when I opened the hood and looked  But =
listening closely, I thought I could hear a faint sizzling sound from =
somewhere within the carb...   I did not try a restart, since I hadn't =
seen this video at that point.

Any opinions?

Stu
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<HTML><HEAD></HEAD>
<BODY dir=3Dltr>
<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>I finally got around to watching this video. It was like watching =
paint=20
dry. It could have been 30 seconds long, not 20 minutes. But anyway =
(it=E2=80=99s not=20
Stu=E2=80=99s fault), it did eventually shows the gas boil at a low =
temperature.&nbsp;=20
I=E2=80=99ll just throw these things out there:</DIV>
<DIV>&nbsp;</DIV>
<DIV>1. No one ever mentions it, but there has to be some cooling effect =
of both=20
from the air being drawn into the carburetor and the evaporation effect =
of the=20
gas (like when you apply rubbing alcohol to your body).&nbsp; Then =
again,=20
without cold air ducting..., maybe not.</DIV>
<DIV>&nbsp;</DIV>
<DIV>2. A cooling effect likely offsets some of the heat soak while the =
car is=20
in use. However, when the engine is stopped that cooling also =
ceases.</DIV>
<DIV>&nbsp;</DIV>
<DIV>3. It would seem best to isolate and insulate the carburetor from =
the rest=20
of the engine compartment.&nbsp; This, however would require some type =
of hood=20
scoop (or duct) and and an isolation enclosure under an already crowded=20
hood.</DIV>
<DIV>&nbsp;</DIV>
<DIV>4. I=E2=80=99m wondering if the horn opening block off plates some =
use (that work=20
at idle/stopped) to prevent recirculation are a detriment at higher =
speeds not=20
allowing cooler air to pass through the engine compartment?&nbsp; =
I=E2=80=99ve always=20
through a spring loaded door seemed a better concept. Closed at an =
idle/stopped=20
condition, but opened from the flow of air as the car moved =
forward.</DIV>
<DIV>&nbsp;</DIV>
<DIV>5. If anyone is interested, some of the 280Z=E2=80=99s had a fan =
and ducting that=20
blew air onto the injector rail. The concept would seem somewhat =
adaptable to=20
blowing cool air on the carburetor after the car shut off. A 555 Timer =
could=20
control the run time after shut-off.</DIV>
<DIV>&nbsp;</DIV>
<DIV>It seems any attempt for correction deviates from a stock =
appearance. And,=20
a crowded area under the hood doesn=E2=80=99t leave many options for =
isolation or=20
ducting. Has anyone run without their hood to see it it makes a=20
difference?</DIV>
<DIV>&nbsp;</DIV>
<DIV>Just some rambling thoughts.</DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV style=3D"FONT: 10pt tahoma">
<DIV><FONT size=3D3 face=3DCalibri></FONT>&nbsp;</DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=[email-masked]=20
href=3D"mailto:[email-masked]">Stu via Tigers</A> </DIV>
<DIV><B>Sent:</B> Friday, September 11, 2015 5:42 PM</DIV>
<DIV><B>To:</B> <A title=[email-masked]=20
href=3D"mailto:[email-masked]">Tiger Net</A> </DIV>
<DIV><B>Subject:</B> [Tigers] Carb Fire Research</DIV></DIV></DIV>
<DIV>&nbsp;</DIV></DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV dir=3Dltr>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: small">
<DIV class=3Dgmail_default style=3D"FONT-SIZE: x-small; COLOR: =
rgb(0,0,0)">I've been=20
doing some research, and found an interesting video:</DIV>
<DIV class=3Dgmail_default=20
style=3D"FONT-SIZE: x-small; COLOR: rgb(0,0,0)">&nbsp;</DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1><A href=3D"https://www.youtube.com/watch?v=3Dd7AkcjnCTVU"=20
target=3D_blank>https://www.youtube.com/watch?v=3Dd7AkcjnCTVU</A></FONT><=
BR></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1><BR></FONT></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1>To summarize, this guy does a good experiment that proves that =
some=20
components of normal gasoline boil at around 170F.</FONT></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1><BR></FONT></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1>Our engines are usually well above this, so when we stop it's =
safe to=20
assume that the underhood temperatures spike, heating up our carbs, and=20
everything else.&nbsp; So there could easily be some boiling in the =
carb&nbsp;=20
bowl.&nbsp; And once the 170F components boil off,&nbsp; the temperature =
rises=20
even more.&nbsp; When trying a hot restart, new fuel is introduced to =
the much=20
hotter carb when the pump comes back on, perhaps there could be a few =
moments of=20
additional, perhaps more violent boiling, blowing vapor and fuel out the =

vent.</FONT></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1><BR></FONT></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1>Last weekend I tried recreating the problem.&nbsp; Similar hot =
day, drove=20
around the same loop, etc.&nbsp; Parked and waited 10 minutes, about the =
same=20
time as before.&nbsp; I had cleaned the top of the carb, so it was =
obvious that=20
nothing had come out when I opened the hood and looked&nbsp; But =
listening=20
closely, I thought I could hear a faint sizzling sound from somewhere =
within the=20
carb...&nbsp;&nbsp; I did not try a restart, since I hadn't seen this =
video at=20
that point.</FONT></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1><BR></FONT></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1>Any opinions?</FONT></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1><BR></FONT></DIV>
<DIV class=3Dgmail_default style=3D"FONT-SIZE: 14px; COLOR: =
rgb(0,0,0)"><FONT=20
size=3D1>Stu</FONT></DIV></DIV></DIV></DIV></DIV></DIV></BODY></HTML>

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[email-masked]

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---

From: Stu via Tigers <[email-masked]>
Date: Tue, 15 Sep 2015 15:48:10 -0400

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The video length?  That's why they invented fast forward buttons, progress
sliders, etc.

I haven't measured it, but I'll guess our underhood temps while moving, or
even while idling with our poorly positioned fans running, is not high
enough to boil the fuel.  When we stop the engine and the airflow pretty
much stops (except for what escapes through the hood gaps, etc), then the
air temp goes up, to the vicinity of the temp of that big hunk of iron
below the carb.  A spacer may reduce the conducted heat, but if the air all
around the carb is hot, the carb temp will go up.

For an experiment I added a drain to the carb vent, and did see fuel coming
out after stopping.  This weekend I hope to open the carb and check the
fuel level, etc.  I used my IR thermometer to read temps on stuff that was
nearly black, and there were many spots that were initially well over 170,
some even after 15 minutes with the hood open.

My first generation Jetta had large flexible flaps over large holes in the
panel the radiator mounted on.  The would apparently open when the car was
in motion, but close when the car stopped, to prevent hot air recirculation=
.

I already thought of using the electric fan many of us have as a "bilge
blower" (like on boats) on hot restarts.

Stu

On Tue, Sep 15, 2015 at 2:48 PM, Tom Witt via Tigers <[email-masked]=
wrote:

> I finally got around to watching this video. It was like watching paint
> dry. It could have been 30 seconds long, not 20 minutes. But anyway (it=
=E2=80=99s
> not Stu=E2=80=99s fault), it did eventually shows the gas boil at a low
> temperature.  I=E2=80=99ll just throw these things out there:
>
> 1. No one ever mentions it, but there has to be some cooling effect of
> both from the air being drawn into the carburetor and the evaporation
> effect of the gas (like when you apply rubbing alcohol to your body).  Th=
en
> again, without cold air ducting..., maybe not.
>
> 2. A cooling effect likely offsets some of the heat soak while the car is
> in use. However, when the engine is stopped that cooling also ceases.
>
> 3. It would seem best to isolate and insulate the carburetor from the res=
t
> of the engine compartment.  This, however would require some type of hood
> scoop (or duct) and and an isolation enclosure under an already crowded
> hood.
>
> 4. I=E2=80=99m wondering if the horn opening block off plates some use (t=
hat work
> at idle/stopped) to prevent recirculation are a detriment at higher speed=
s
> not allowing cooler air to pass through the engine compartment?  I=E2=80=
=99ve
> always through a spring loaded door seemed a better concept. Closed at an
> idle/stopped condition, but opened from the flow of air as the car moved
> forward.
>
> 5. If anyone is interested, some of the 280Z=E2=80=99s had a fan and duct=
ing that
> blew air onto the injector rail. The concept would seem somewhat adaptabl=
e
> to blowing cool air on the carburetor after the car shut off. A 555 Timer
> could control the run time after shut-off.
>
> It seems any attempt for correction deviates from a stock appearance. And=
,
> a crowded area under the hood doesn=E2=80=99t leave many options for isol=
ation or
> ducting. Has anyone run without their hood to see it it makes a differenc=
e?
> *From:* Stu via Tigers <[email-masked]>
> *Sent:* Friday, September 11, 2015 5:42 PM
> *To:* Tiger Net <[email-masked]>
> *Subject:* [Tigers] Carb Fire Research
>
> everything else.  So there could easily be some boiling in the carb  bowl=
.
> time as before.  I had cleaned the top of the carb, so it was obvious tha=
t
> http://autox.team.net/mailman/options/tigers/[email-masked]
>
>
>
>

--089e0141aa1a2f170d051fce762f
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">The=
 video length?=C2=A0 That&#39;s why they invented fast forward buttons, pro=
gress sliders, etc.</div><div class=3D"gmail_default" style=3D"font-size:sm=
all"><br></div><div class=3D"gmail_default" style=3D"font-size:small">I hav=
en&#39;t measured it, but I&#39;ll guess our underhood temps while moving, =
or even while idling with our poorly positioned fans running, is not high e=
nough to boil the fuel.=C2=A0 When we stop the engine and the airflow prett=
y much stops (except for what escapes through the hood gaps, etc), then the=
 air temp goes up, to the vicinity of the temp of that big hunk of iron bel=
ow the carb.=C2=A0 A spacer may reduce the conducted heat, but if the air a=
ll around the carb is hot, the carb temp will go up.</div><div class=3D"gma=
il_default" style=3D"font-size:small"><br></div><div class=3D"gmail_default=
" style=3D"font-size:small">For an experiment I added a drain to the carb v=
ent, and did see fuel coming out after stopping.=C2=A0 This weekend I hope =
to open the carb and check the fuel level, etc.=C2=A0 I used my IR thermome=
ter to read temps on stuff that was nearly black, and there were many spots=
 that were initially well over 170, some even after 15 minutes with the hoo=
d open.</div><div class=3D"gmail_default" style=3D"font-size:small"><br></d=
iv><div class=3D"gmail_default" style=3D"font-size:small">My first generati=
on Jetta had large flexible flaps over large holes in the panel the radiato=
r mounted on.=C2=A0 The would apparently open when the car was in motion, b=
ut close when the car stopped, to prevent hot air recirculation.</div><div =
class=3D"gmail_default" style=3D"font-size:small"><br></div><div class=3D"g=
mail_default" style=3D"font-size:small">I already thought of using the elec=
tric fan many of us have as a &quot;bilge blower&quot; (like on boats) on h=
ot restarts.</div><div class=3D"gmail_default" style=3D"font-size:small"><b=
r></div><div class=3D"gmail_default" style=3D"font-size:small">Stu</div></d=
iv><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Tue, Sep 15=
, 2015 at 2:48 PM, Tom Witt via Tigers <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:[email-masked]" target=3D"_blank">[email-masked]</a>&gt;<=
/span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir=3D"ltr">
<div dir=3D"ltr">
<div style=3D"FONT-SIZE:12pt;FONT-FAMILY:&#39;Calibri&#39;;COLOR:#000000">
<div>I finally got around to watching this video. It was like watching pain=
t=20
dry. It could have been 30 seconds long, not 20 minutes. But anyway (it=E2=
=80=99s not=20
Stu=E2=80=99s fault), it did eventually shows the gas boil at a low tempera=
ture.=C2=A0=20
I=E2=80=99ll just throw these things out there:</div>
<div>=C2=A0</div>
<div>1. No one ever mentions it, but there has to be some cooling effect of=
 both=20
from the air being drawn into the carburetor and the evaporation effect of =
the=20
gas (like when you apply rubbing alcohol to your body).=C2=A0 Then again,=
=20
without cold air ducting..., maybe not.</div>
<div>=C2=A0</div>
<div>2. A cooling effect likely offsets some of the heat soak while the car=
 is=20
in use. However, when the engine is stopped that cooling also ceases.</div>
<div>=C2=A0</div>
<div>3. It would seem best to isolate and insulate the carburetor from the =
rest=20
of the engine compartment.=C2=A0 This, however would require some type of h=
ood=20
scoop (or duct) and and an isolation enclosure under an already crowded=20
hood.</div>
<div>=C2=A0</div>
<div>4. I=E2=80=99m wondering if the horn opening block off plates some use=
 (that work=20
at idle/stopped) to prevent recirculation are a detriment at higher speeds =
not=20
allowing cooler air to pass through the engine compartment?=C2=A0 I=E2=80=
=99ve always=20
through a spring loaded door seemed a better concept. Closed at an idle/sto=
pped=20
condition, but opened from the flow of air as the car moved forward.</div>
<div>=C2=A0</div>
<div>5. If anyone is interested, some of the 280Z=E2=80=99s had a fan and d=
ucting that=20
blew air onto the injector rail. The concept would seem somewhat adaptable =
to=20
blowing cool air on the carburetor after the car shut off. A 555 Timer coul=
d=20
control the run time after shut-off.</div>
<div>=C2=A0</div>
<div>It seems any attempt for correction deviates from a stock appearance. =
And,=20
a crowded area under the hood doesn=E2=80=99t leave many options for isolat=
ion or=20
ducting. Has anyone run without their hood to see it it makes a=20
difference?</div>
<div>=C2=A0</div>
<div>Just some rambling thoughts.</div>
<div style=3D"FONT-SIZE:small;TEXT-DECORATION:none;FONT-FAMILY:&quot;Calibr=
i&quot;;FONT-WEIGHT:normal;COLOR:#000000;FONT-STYLE:normal;DISPLAY:inline">
<div style=3D"FONT:10pt tahoma">
<div><font size=3D"3" face=3D"Calibri"></font>=C2=A0</div>
<div style=3D"BACKGROUND:#f5f5f5">
<div><b>From:</b> <a title=3D"[email-masked]" href=3D"mailto:tigers@=
autox.team.net" target=3D"_blank">Stu via Tigers</a> </div>
<div><b>Sent:</b> Friday, September 11, 2015 5:42 PM</div>
<div><b>To:</b> <a title=3D"[email-masked]" href=3D"mailto:Tigers@au=
tox.team.net" target=3D"_blank">Tiger Net</a> </div>
<div><b>Subject:</b> [Tigers] Carb Fire Research</div></div></div>
<div>=C2=A0</div></div>
<div style=3D"FONT-SIZE:small;TEXT-DECORATION:none;FONT-FAMILY:&quot;Calibr=
i&quot;;FONT-WEIGHT:normal;COLOR:#000000;FONT-STYLE:normal;DISPLAY:inline">
<div dir=3D"ltr">
<div class=3D"gmail_default" style=3D"FONT-SIZE:small">
<div class=3D"gmail_default" style=3D"FONT-SIZE:x-small;COLOR:rgb(0,0,0)">I=
&#39;ve been=20
doing some research, and found an interesting video:</div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:x-small;COLOR:rgb(0,0,0)">=
=C2=A0</div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1"><a href=3D"https://www.youtube.com/watch?v=3Dd7AkcjnCTVU" targ=
et=3D"_blank">https://www.youtube.com/watch?v=3Dd7AkcjnCTVU</a></font><br><=
/div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1"><br></font></div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1">To summarize, this guy does a good experiment that proves that=
 some=20
components of normal gasoline boil at around 170F.</font></div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1"><br></font></div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1">Our engines are usually well above this, so when we stop it&#3=
9;s safe to=20
assume that the underhood temperatures spike, heating up our carbs, and=20
everything else.=C2=A0 So there could easily be some boiling in the carb=C2=
=A0=20
bowl.=C2=A0 And once the 170F components boil off,=C2=A0 the temperature ri=
ses=20
even more.=C2=A0 When trying a hot restart, new fuel is introduced to the m=
uch=20
hotter carb when the pump comes back on, perhaps there could be a few momen=
ts of=20
additional, perhaps more violent boiling, blowing vapor and fuel out the=20
vent.</font></div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1"><br></font></div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1">Last weekend I tried recreating the problem.=C2=A0 Similar hot=
 day, drove=20
around the same loop, etc.=C2=A0 Parked and waited 10 minutes, about the sa=
me=20
time as before.=C2=A0 I had cleaned the top of the carb, so it was obvious =
that=20
nothing had come out when I opened the hood and looked=C2=A0 But listening=
=20
closely, I thought I could hear a faint sizzling sound from somewhere withi=
n the=20
carb...=C2=A0=C2=A0 I did not try a restart, since I hadn&#39;t seen this v=
ideo at=20
that point.</font></div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1"><br></font></div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1">Any opinions?</font></div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1"><br></font></div>
<div class=3D"gmail_default" style=3D"FONT-SIZE:14px;COLOR:rgb(0,0,0)"><fon=
t size=3D"1">Stu</font></div></div></div></div></div></div></div>
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