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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
I've been doing some research, and found an interesting video:
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. =20
I=E2=80=99ll 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=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). Then =
again,=20
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=20
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=20
of the engine compartment. 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> </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? =
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> </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> </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> </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> </DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dtigers@autox.team.net=20
href=3D"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=3DTigers@autox.team.net=20
href=3D"mailto:Tigers@autox.team.net";>Tiger Net</A> </DIV>
<DIV><B>Subject:</B> [Tigers] Carb Fire Research</DIV></DIV></DIV>
<DIV> </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)"> </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. So there could easily be some boiling in the =
carb =20
bowl. And once the 170F components boil off, the temperature =
rises=20
even more. 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. Similar hot =
day, drove=20
around the same loop, etc. Parked and waited 10 minutes, about the =
same=20
time as before. 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 But =
listening=20
closely, I thought I could hear a faint sizzling sound from somewhere =
within the=20
carb... 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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