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<DIV>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’s not
Stu’s fault), it did eventually shows the gas boil at a low temperature.
I’ll just throw these things out there:</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>4. I’m 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’ve 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.</DIV>
<DIV> </DIV>
<DIV>5. If anyone is interested, some of the 280Z’s 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.</DIV>
<DIV> </DIV>
<DIV>It seems any attempt for correction deviates from a stock appearance. And,
a crowded area under the hood doesn’t leave many options for isolation or
ducting. Has anyone run without their hood to see it it makes a
difference?</DIV>
<DIV> </DIV>
<DIV>Just some rambling thoughts.</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net">Stu via Tigers</A> </DIV>
<DIV><B>Sent:</B> Friday, September 11, 2015 5:42 PM</DIV>
<DIV><B>To:</B> <A title=Tigers@autox.team.net
href="mailto:Tigers@autox.team.net">Tiger Net</A> </DIV>
<DIV><B>Subject:</B> [Tigers] Carb Fire Research</DIV></DIV></DIV>
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<DIV class=gmail_default style="FONT-SIZE: x-small; COLOR: rgb(0,0,0)">I've been
doing some research, and found an interesting video:</DIV>
<DIV class=gmail_default
style="FONT-SIZE: x-small; COLOR: rgb(0,0,0)"> </DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1><A href="https://www.youtube.com/watch?v=d7AkcjnCTVU"
target=_blank>https://www.youtube.com/watch?v=d7AkcjnCTVU</A></FONT><BR></DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1><BR></FONT></DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=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=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1><BR></FONT></DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1>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.</FONT></DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1><BR></FONT></DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1>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.</FONT></DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1><BR></FONT></DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1>Any opinions?</FONT></DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1><BR></FONT></DIV>
<DIV class=gmail_default style="FONT-SIZE: 14px; COLOR: rgb(0,0,0)"><FONT
size=1>Stu</FONT></DIV></DIV></DIV></DIV></DIV></DIV></BODY></HTML>