[Tigers] Carb Fire Research

[Stu via Tigers <tigers@autox.team.net>]

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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

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small"><di=
v class=3D"gmail_default" style=3D"color:rgb(0,0,0);font-size:x-small">I&#3=
9;ve been doing some research, and found an interesting video:</div><div cl=
ass=3D"gmail_default" style=3D"color:rgb(0,0,0);font-size:x-small"><br></di=
v><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"color:rgb(0,0,0);font-size:1=
4.4px"><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">To summarize, this =
guy does a good experiment that proves that some components of normal gasol=
ine 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 c=
lass=3D"gmail_default" style=3D"color:rgb(0,0,0);font-size:14.4px"><font si=
ze=3D"1">Our engines are usually well above this, so when we stop it&#39;s =
safe to assume that the underhood temperatures spike, heating up our carbs,=
 and everything else.=C2=A0 So there could easily be some boiling in the ca=
rb =C2=A0bowl.=C2=A0 And once the 170F components boil off, =C2=A0the tempe=
rature rises even more.=C2=A0 When trying a hot restart, new fuel is introd=
uced to the much hotter carb when the pump comes back on, perhaps there cou=
ld be a few moments of additional, perhaps more violent boiling, blowing va=
por and fuel out the vent.</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><d=
iv class=3D"gmail_default" style=3D"color:rgb(0,0,0);font-size:14.4px"><fon=
t size=3D"1">Last weekend I tried recreating the problem.=C2=A0 Similar hot=
 day, drove around the same loop, etc.=C2=A0 Parked and waited 10 minutes, =
about the same time as before.=C2=A0 I had cleaned 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 h=
adn&#39;t seen this video at that point.</font></div><div class=3D"gmail_de=
fault" style=3D"color:rgb(0,0,0);font-size:14.4px"><font size=3D"1"><br></f=
ont></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><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></div></div>

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