Intake Manifold Question

E

Ed Price

Guest
Most of our Amphis have the original one-piece intake/exhaust manifold. However,
some Amphis have been re-engined with the larger Triumph engines, often with the
dual side-flow carburetors.

I have noticed that there is a hose fitting on these dual intake manifolds which
hooks up to the engine coolant system. Is the coolant supposed to warm up the
intake manifold in very cold weather, minimizing the chance of carburetor icing?
Or is the coolant supposed to keep the engine block heat away from the
carburetors after the engine reaches normal operating temperature?


Ed
El Cajon, CA USA
67 Rust Guppy


[Non-text portions of this message have been removed]
 
J

John Friese

Guest
Hi Ed,

As you know, I have put larger engines in both my Amphicars and use
the Pierce manifold with a Weber DGV two barrel, downdraft carb.
setup. The manifolds have that pipe running under them but since I'm
in the moderate weather of California, I didn't bother to connect the
heater line through that piece of pipe and don't have any trouble at
all. I'ts quite possible that having cooling water running under the
manifold would serve both those purposes when operating in extreme
weather conditions. I've never had any vapor lock problems when
running hard at 106 degree temperatures though.

I avoid those side draft setups though since there's no way to pull
cool air into the carbs and since the intakes are right next to the
muffler in an Amphicar, the problem would be at it's worst in this
application. The dual carb setup is also expensive and requires
balancing the carbs. The two barrel DGV carb is reliable, can be
made to work with the Amphicar air cleaner and looks like a stock
installation, only better.

John Friese
67 White
67 Red




--- In amphicar-lovers@yahoogroups.com, "Ed Price" <wb6wsn@c...>
wrote:
> Most of our Amphis have the original one-piece intake/exhaust
manifold. However, some Amphis have been re-engined with the larger
Triumph engines, often with the dual side-flow carburetors.
>
> I have noticed that there is a hose fitting on these dual intake
manifolds which hooks up to the engine coolant system. Is the coolant
supposed to warm up the intake manifold in very cold weather,
minimizing the chance of carburetor icing? Or is the coolant supposed
to keep the engine block heat away from the carburetors after the
engine reaches normal operating temperature?
>
>
> Ed
> El Cajon, CA USA
> 67 Rust Guppy
>
>
> [Non-text portions of this message have been removed]
 
W

WB6WSN

Guest
Re: Re: Intake Manifold Question

----- Original Message -----
From: John Friese
To: amphicar-lovers@yahoogroups.com
Sent: Saturday, October 16, 2004 9:37 PM
Subject: [amphicar-lovers] Re: Intake Manifold Question



Hi Ed,

As you know, I have put larger engines in both my Amphicars and use
the Pierce manifold with a Weber DGV two barrel, downdraft carb.
setup. The manifolds have that pipe running under them but since I'm
in the moderate weather of California, I didn't bother to connect the
heater line through that piece of pipe and don't have any trouble at
all. I'ts quite possible that having cooling water running under the
manifold would serve both those purposes when operating in extreme
weather conditions. I've never had any vapor lock problems when
running hard at 106 degree temperatures though.

I avoid those side draft setups though since there's no way to pull
cool air into the carbs and since the intakes are right next to the
muffler in an Amphicar, the problem would be at it's worst in this
application. The dual carb setup is also expensive and requires
balancing the carbs. The two barrel DGV carb is reliable, can be
made to work with the Amphicar air cleaner and looks like a stock
installation, only better.

John Friese
67 White
67 Red



I have been giving some thought to possibilites of isolating the carburetor from
the heat of the exhaust manifold, and there seems to be a few choices for
alternate manifolds. The Pierce manifold that you used (this one?)

http://www.piercemanifolds.com/Images/Catalog/99003.807PM.htm

seems to be only for the larger Triumph (8-port heads), and allows for a
downdraft Weber DGV carburetor. Maybe you used the whole kit:

http://www.piercemanifolds.com/Images/Catalog/P17-010.htm

But I'm not intending to change my engine, so I'm looking for solutions for the
1147cc, 6-port head, GA or GB engine. I'm not very close to doing this work, but
a little exploring never hurts, and you can watch eBay for bargains with no
compulsion to buy <g>. I already bought a used exhaust-only manifold, and I was
looking at the intake manifold choices. Maybe Pierce has a manifold for the
6-port head engines. I kinda like the single-carb idea, as it keeps the engine
more original, but there also seems to be a lot of 1.25" dual side-flow intake
manifolds available, so that steers me toward a sideflow, dual-carb setup.

From what I've read, few have any good words about any kind of Solex carbs, so
I'm not too averse to using a different carb from the Solex 30PSEI that I have
(it'll need a complete rebuild anyway). Beyond that, is the Weber DGV "too much"
for the 1147cc engine? Any speculation?

Ed
El Cajon, CA USA
67 Rust Guppy


[Non-text portions of this message have been removed]
 
J

John Friese

Guest
Ed,

I ran the stock Amphicar carb and engine setup for two years out here
in California and never experienced any problem with the vapor lock on
the 1147 engine, so perhaps you are worrying about a problem that you
will never have. The only thing I found that was odd about the Solex
on my car was it was easy to flood the engine when cold and starting
it took a little practice to get right. The Weber carbs aren't at all
touchy to use.

Someone posted a note about switching the head on an 1147 to an 8 port
version. I wasn't interested in doing that however and didn't pay
much attention to it but evidently at some time Triumph made such a
head. Since you are more interested in "stock" condition than I am, I
would simply build your car up with the normal parts and try it. It's
going to be a lot cheaper than dealing with the issues you'll come up
with once you switch something. I would only switch something on the
engine if you wanted some form of improved performance.

John Friese
67 White
67 Red




--- In amphicar-lovers@yahoogroups.com, "WB6WSN" <wb6wsn@c...> wrote:
>
> ----- Original Message -----
> From: John Friese
> To: amphicar-lovers@yahoogroups.com
> Sent: Saturday, October 16, 2004 9:37 PM
> Subject: [amphicar-lovers] Re: Intake Manifold Question
>
>
>
> Hi Ed,
>
> As you know, I have put larger engines in both my Amphicars and use
> the Pierce manifold with a Weber DGV two barrel, downdraft carb.
> setup. The manifolds have that pipe running under them but since I'm
> in the moderate weather of California, I didn't bother to connect the
> heater line through that piece of pipe and don't have any trouble at
> all. I'ts quite possible that having cooling water running under the
> manifold would serve both those purposes when operating in extreme
> weather conditions. I've never had any vapor lock problems when
> running hard at 106 degree temperatures though.
>
> I avoid those side draft setups though since there's no way to pull
> cool air into the carbs and since the intakes are right next to the
> muffler in an Amphicar, the problem would be at it's worst in this
> application. The dual carb setup is also expensive and requires
> balancing the carbs. The two barrel DGV carb is reliable, can be
> made to work with the Amphicar air cleaner and looks like a stock
> installation, only better.
>
> John Friese
> 67 White
> 67 Red
>
>
>
> I have been giving some thought to possibilites of isolating the
carburetor from the heat of the exhaust manifold, and there seems to
be a few choices for alternate manifolds. The Pierce manifold that you
used (this one?)
>
> http://www.piercemanifolds.com/Images/Catalog/99003.807PM.htm
>
> seems to be only for the larger Triumph (8-port heads), and allows
for a downdraft Weber DGV carburetor. Maybe you used the whole kit:
>
> http://www.piercemanifolds.com/Images/Catalog/P17-010.htm
>
> But I'm not intending to change my engine, so I'm looking for
solutions for the 1147cc, 6-port head, GA or GB engine. I'm not very
close to doing this work, but a little exploring never hurts, and you
can watch eBay for bargains with no compulsion to buy <g>. I already
bought a used exhaust-only manifold, and I was looking at the intake
manifold choices. Maybe Pierce has a manifold for the 6-port head
engines. I kinda like the single-carb idea, as it keeps the engine
more original, but there also seems to be a lot of 1.25" dual
side-flow intake manifolds available, so that steers me toward a
sideflow, dual-carb setup.
>
> From what I've read, few have any good words about any kind of Solex
carbs, so I'm not too averse to using a different carb from the Solex
30PSEI that I have (it'll need a complete rebuild anyway). Beyond
that, is the Weber DGV "too much" for the 1147cc engine? Any speculation?
>
> Ed
> El Cajon, CA USA
> 67 Rust Guppy
>
>
> [Non-text portions of this message have been removed]
 
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