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>> Today was 97 degrees and I tested my hypothesis. Drove until it was
>> hot and then parked it in front of the house. After 30 minutes,
>> started it up and it was a repeat performance. Ran rough and then
>> died. Checked the plugs âEUR" they were all very sooty. Would you
>> expect this from vapor lock?
When I was growing up, my dad called it "heat soak".
You park a hot car. With the cooling system off, the engine gets warmer
before it gets cooler. More so when it is hot outside and ambient air
can't help cool the engine down as much. The fuel exposed to hot
surfaces inside the carb expand from the heat and flow into the intake
manifold, puddling there. Eventually as the engine cools it will
evaporate. But if you try to start the engine before it evaporates you
get whatever the carb gives the cylinder plus the puddled fuel which
floods the engine in an over rich condition. That's why carb'ed cars
can be hard to restart during the first half hour or so after stopping
the engine on a hot day.
Not an issue with EFI but common enough with a carb.
Teriann
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<br>
<blockquote cite="mid:2274c.57f5e1a3.3b236045@cs.com"; type="cite">
<blockquote type="CITE"
style="border-left: 2px solid rgb(0, 0, 255); margin-left: 5px; margin-right:
0px; padding-left: 5px;"><font
face="arial,helvetica"><font back="#ffffff"
style="background-color: rgb(255, 255, 255);" ptsize="12"
family="SANSSERIF" color="#000000" face="Arial" lang="0" size="3"> </font><font
back="#ffffff" style="background-color: rgb(255, 255, 255);"
ptsize="10" family="SANSSERIF" color="#000000" face="Arial" lang="0"
size="2">Today was 97 degrees and I tested my hypothesis. Drove until
it was hot and then parked it in front of the house. After 30 minutes,
started it up and it was a repeat performance. Ran rough and then died.
Checked the plugs – they were all very sooty. Would
you expect this
from vapor lock?</font></font><br>
</blockquote>
</blockquote>
<font color="#000000"><font size="2"><font face="Arial">When I was
growing up, my dad called it "heat soak".<br>
<br>
You park a hot car. With the cooling system off, the engine gets warmer
before it gets cooler. More so when it is hot outside and ambient air
can't help cool the engine down as much. The fuel exposed to hot
surfaces inside the carb expand from the heat and flow into the intake
manifold, puddling there. Eventually as the engine cools it will
evaporate. But if you try to start the engine before it evaporates you
get whatever the carb gives the cylinder plus the puddled fuel which
floods the engine in an over rich condition. That's why carb'ed cars
can be hard to restart during the first half hour or so after stopping
the engine on a hot day.<br>
<br>
Not an issue with EFI but common enough with a carb.<br>
<br>
Teriann<br>
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