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Had a thought (that didn't die of loneliness):
The intake manifold sits atop the exhaust manifold (on later cars with the
'log' manifold). This is so the exhaust can keep the carbs warm to aid in
atomization of fuel and prevent wall-wetting (most other carburetted cars pass
warm coolant through the base of the carb to do the same thing). There should
be a couple gaskets between, and I've never known for sure if the gaskets are
to insulate the intake or to help pass the heat. Probably the former, but if
it's the latter and yours are missing that MIGHT be part of the issue. If
you've ever pressure-washed your engine you might have destroyed these gaskets.
Bob
----- Original Message -----
From: "Bob Spidell" <bspidell@comcast.net>
To: "healeys" <healeys@autox.team.net>
Sent: Thursday, November 12, 2015 5:07:47 AM
Subject: Re: [Healeys] Fuel from the manifold drip tubes
That's mostly normal when the engine's cold, but shouldn't happen much,
if at all, once it's been warmed-up. The only explanation I can think
of is running rich, due to the reasons Alan suggested. I have gotten it
occasionally on my BJ8 when warm, though.
Google 'wall wetting' for some technical info, although it mostly
applies to injected engines (I always assumed it wouldn't happen with
injected engines, but it can be a problem with them, too).
Bob
On 11/11/2015 8:39 PM, Elton Schulz wrote:
> Fellow Listers,
> I'm getting a small amount of fuel dripping out from the intake
> manifold drip pipes from my BJ7 when idling. What causes that? The
> engine is running well and it doesn't appear to be on the rich side.
> Thanks,
> Elton
>
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div aria-label=3D"Compose body">Had a thought (that didn't die of lone=
liness):<br></div><div aria-label=3D"Compose body"><br></div><div aria-labe=
l=3D"Compose body">The intake manifold sits atop the exhaust manifold (on l=
ater cars with the 'log' manifold). This is so the exhaust can keep t=
he carbs warm to aid in atomization of fuel and prevent wall-wetting (most =
other carburetted cars pass warm coolant through the base of the carb to do=
the same thing). There should be a couple gaskets between, and I've =
never known for sure if the gaskets are to insulate the intake or to help p=
ass the heat. Probably the former, but if it's the latter and yours a=
re missing that MIGHT be part of the issue. If you've ever pressure-w=
ashed your engine you might have destroyed these gaskets.<br></div><div ari=
a-label=3D"Compose body"><br></div><div aria-label=3D"Compose body">Bob<br>=
</div><div><br></div><hr id=3D"zwchr"><div style=3D"color:#000;font-weight:=
normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,s=
ans-serif;font-size:12pt;" data-mce-style=3D"color: #000; font-weight: norm=
al; font-style: normal; text-decoration: none; font-family: Helvetica,Arial=
,sans-serif; font-size: 12pt;"><b>From: </b>"Bob Spidell" <bspidell@comc=
ast.net><br><b>To: </b>"healeys" <healeys@autox.team.net><br><b>Se=
nt: </b>Thursday, November 12, 2015 5:07:47 AM<br><b>Subject: </b>Re: [Heal=
eys] Fuel from the manifold drip tubes<br><div><br></div>That's mostly norm=
al when the engine's cold, but shouldn't happen much, <br>if at all, once i=
t's been warmed-up. The only explanation I can think <br>of is runnin=
g rich, due to the reasons Alan suggested. I have gotten it <br>occas=
ionally on my BJ8 when warm, though.<br><div><br></div>Google 'wall wetting=
' for some technical info, although it mostly <br>applies to injected engin=
es (I always assumed it wouldn't happen with <br>injected engines, but it c=
an be a problem with them, too).<br><div><br></div>Bob<br><div><br></div>On=
11/11/2015 8:39 PM, Elton Schulz wrote:<br>> Fellow Listers,<br>> I'=
m getting a small amount of fuel dripping out from the intake <br>> mani=
fold drip pipes from my BJ7 when idling. What causes that? The <br>> eng=
ine is running well and it doesn't appear to be on the rich side.<br>> T=
hanks,<br>> Elton<br>><br><br><div><br></div></div><div><br></div></d=
iv></body></html>
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