In 1964, Ford Motor Company decided to wedge a 427 big block into a
Fairlane. It was an engineering nightmare but when they were
done,
the Thunderbolt was born. Many modifications were made to
this car
including frame, suspension, and, most importantly, true ram air.
Many people have "ram air "
on their cars, or at least they think they
do. A hood scoop is a wonderful way to provide cool fresh air to
a motor, however, even if you are cruising down the road at 80+MPH,
there is
not enough air pressure at the scoop to force air into the motor.
The problem is that air pressure is created in front of the car.
As the air is pushed out of the way, it is forced up, down , and
to the sides. The upward motion of the air dissipating off the
front of the car redirects any forward air that would be going into
your hood
scoop, up and over the car. Think of it like a bug deflector,
but instead of pushing bugs up and over the car, it is air flow. I
received this quote in an email:
"I have
experience in the "Bug
Deflector" idea. I have an '89 Mustang with a Cervini's Ram Air
hood. I spent probably an extra $400 for the ram air kit.
From 0-30 MPH, there is very little difference and could be slightly
slower. From 30-80, you can feel a SLIGHT bit of increase.
At 80+, there is a tremendous bog due to lack of air. I left the
kit functional for only about a month. Since then, it's taking up
storage space in the basement." Scott Fouts
As illustrated, this means
little-to-no air pressure at the scoop. There is a
solution, however, tubes can be run from the front of the car to a
sealed air cleaner holder, which will give you true ram air. The
best part is, this is something you can build at home with very little
time and money.
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This
is what the original Ford ram air set up looks like on the Thunderbolt.
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As
you can see, one set of
headlights was removed and replaced with the air inlets
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This is a stock Ford air
cleaner. This part was relatively unchanged from the early 70s
until it was no longer needed when EFI replaced the carb. For the
most part, all makes and models of Ford vehicles had the same
basic system.
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The first step is to
remove the air inlet snout. There are either two bolts or two
rivets
holding it to the air cleaner housing. I found that drilling out
the rivets works very well. If you want a dual snorkel system you
will need two of these.
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the stock air inlet snout that will be used in the ram air
system.
There are three spot welds attaching this to the inlet snout on both
the
top and bottom. Once drilled out, this piece slides right out off
of the end. After I got all the pieces apart, I blasted them in
my
blast cabinet to get everything clean and ready for reassembly. |
The blue arrow points to
the factory air inlet hole, and the red arrow points to the air inlet
hole that I cut into the air cleaner housing. The new hole is a
mirror image of the factory one, including tabs to help center
the
inlet pieces. The new hole is placed on the other side of
the hump (pointed out by the black arrow) that allows the
air cleaner housing to fit over the distributor
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Two things needed to be
done to the air inlets. First, I cut the rounded tab off of
one inlet so that it didn't hang down past the air cleaner
housing. This is shown by the green arrow. The second thing that
needed to be done was the inlets needed to be flared out to a more
round shape. This is better illustrated below.
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Believe it or not this is
a vital piece of the ram set up, I know it seems
hokey, but you will see that this will work very well. This is
the small size coffee can. It is a 4 inch diameter which is
a perfect fit to the inlet tubes. It is also flexible enough that
is can be shaped, but the thicker ring on the top and bottom hold the 4
inch round shape.
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Once you have removed the
coffee and the label, the can needs to be cut in half right in the
middle. It then needs to be elongated to match the shape of
the air inlets.
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This picture illustrates
the inlet placed into one half of the coffee can. It takes
a little bending and shaping to get it in but it is a fairly good
fit. The gaps will be dealt with later.
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This inside shot shows how
the inlet was bent to match the round shape of the coffee
can. It also shows how the two parts work together to make
a semi smooth transition from round to rectangular. This
transition will be smoothed out in later steps.
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I used poprivits to attach
the coffee can to the inlet. There are 4 of them, one on each
side
of the inlet. One thing that is very important is that I
installed the poprivits from the inside out so that the smooth side is
on the inside. It is important that all surfaces be as
smooth
as possible.
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Before I poprivited the
can onto the inlet, I made 4 cuts on each corner of the can all the way
to the first rib of the can. This allows the metal to move more
freely as the can is smoothed onto the inlet. Note: slight
forming can be done before poprivits are installed, but most of it
should be done after.
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These vice-grips were used
to form the can and the inlet together. I used a tapping
motion, as if removing a dent, to massage the can metal up
against the inlet walls. I also used pressure from my fingers,
and light hammer blows to form the two together. It doesn't need
to
be perfect, just a small amount of gap.
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One thing I learned was
that the bottom half of the can held its round shape during forming
better than the top half, because the
bottom metal seal had not been removed. One thing I would
recommend is that
you waste the coffee by cutting the can in half with out taking the
coffee out so that the top and
bottom seal can be intact during shaping. After shaping a can
opener can be used to remove the seals just as if opening a normal can.
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This is a test-fit
to make sure everything is fitting the way it needs to. As you
can see, the air cleaner is really starting to take shape. On the
next page I will show you how to seal everything up and test it
for leaks, I will also discuss why I used 4" tubing, and why I am not
concerned about some flow restriction caused by using an original air
cleaner.
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Click Here to Go To
Page II
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If you have any questions or
comments please Email me. |
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Disclaimer on Daze Tech Tips
I am not an expert
in this field. I have performed these modifications myself with very
good results. I am passing along restoration and
performance tips for the purpose of education. If you are
concerned about reliability or safety issues, I do not recommend that
you or any other individual perform these changes or attempt to modify
your cars from stock configuration except under your own
volition. I do not assume nor accept any liability for the use of
this
information or how it is applied.
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