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MK III Driver's Side Footbox Vent Location

2.2K views 20 replies 10 participants last post by  JW Putnam  
#1 ·
Well, I have now positively confirmed that I am truly an idiot.

I installed my foot boxes the other day (after a few mods, of course) and I dutifully cut the 3 1/8" holes for my Cobra Earle's vents in the top of both boxes as per instructions. The pasenger side is just fine, but as I was staring at the marvelous job that I did on the driver's side, I now realize that my MKIII driver's box is WAY different from all of the ones in all of the photos that I studied. The top of the box is FAR too high to accomodate the hose under the body. I can't believe that I didn't notice this!!!

Where should I put the vent? It appears that the only obvious spot is on the front of the driver's box, just below the clutch cable exit fitting.

So.........what have you guys done? I can't find any other photos like mine.
 
#2 ·
The drivers side goes on the angled piece of sheet metal farthest away from the engine compartment. Earl's kit came with a cd of pictures showing the recommended location.

Ron
 
#6 ·
That's what I am thinking, but I am concerned about the action cable. Gonna write to Earl and see what he says. I am surprised that no one else has come across this. I don't understand why they changed the design, but......
 
#8 ·
Ive been trying to see one of the new MKIIIa cars in person ever since I heard that ffr had made some changes.

There is a possibility that we can put the vent on the outside of the foot box pointed toward the feet. This is what we did to the VERY OLD pre #1500 cars... But im not sure whether there is enough room for the hose between the new footbox and the fiberglass body on the NEW MKIIIa cars.

We can certainly put the vent on the front of the foot box. There is plenty of cable to do this also.

HOPEFULLY, I will be able to see one of these new cars at Whitbys VERY SOON.

WHY cant FFR just leave well enough alone?????????? :) :) :)

IM WORKING ON IT..... Has anyone installed on the "latest" ffr version that is proud of their installation???

Im thinking that maybe placing the vent high and to the outside of the front might work.... especially if a 90 degree 3" plastic angle is added to direct the air down toward the feet.... to get the "wind chill" effect.

Earl
 
#9 ·
I'm planning to do this mod to mine, and have been waiting for this thread for ideas.

I don't believe there is sufficient space on the outside of the footbox, so I plan on going beneath the clutch quadrant (beneath the rectangle on JW Putnam's photo). Any higher, the pedal box gear is in the way. I suppose it could go closer to the centerline of the car, below the steering shaft, depending on needed cable clearances / pedal clearances.
 
#10 ·
Ive been looking at the photos, plus some others I have.

The probable best location is Immediately below that small aluminum patch.. and as close to the out side as possible. This location, if it will work will put the hose as far away as possible from the 4into4 headers.

JW, can you see if this location would work for you..

Cobraearl
 
#11 ·
Earl,

Here's a couple without the aluminum. Naked roadsters if you will :scared:.

Image


Image


I think it's going to be a tight fit with the new design. Not a lot of room on the outside of the footbox for the hose and not much room on the front for the gate to operate.

Good luck and let us know what our options are. I don't want to think about driving around in the new roadster without your vents :eek:.
 
#12 · (Edited)
I believe that it can be mounted as indicated by my outline on the front of the box with a Sharpie. I think that it will clear the 4 into 4s sufficiently.

On the inside, I will turn it at an angle as indicated in the photo. The clutch pedal does not depress far enough to interfere and there is plenty of room for the gate to slide open.

What do you guys think?

Image



Image
 
#13 ·
Another idea....but not particularly well thought out....

I have no idea what the hole at the top is for....maybe power steering or brakes apparatus....don't know....but it is almost the correct size and the vent will fit inside (barely) or could even be mounted on the outside.

Just a thought.......probably a stupid one.

Image
 
#15 ·
Not sure what you mean. Which 3/4" tube? Are you saying that the circle that I drew with the Sharpie is a poor location? I am guessing that you are referring to the original photo. That is the one that I finally realized was a very stupid mistake.
 
#16 ·
JW,
Your black sharpie circle is getting close to where your 4 into 4 headers will come out. The headers will be hot and may heat up your vent air. Why can't you move it up encroaching on the alum splice plate with the 6 rivets? That little plate is just to cover the gap that allows the bigger front panel to fit around the 3/4 sq tube. ??? I'll have the same problem 'cause my foot box is just like yours. Keep us posted on your solution.
CC
 
#17 ·
wow i just did a search for you, i can't believe you are the first to experience this, but i found nothing.

YES the big hole in the top is for the master cylinder.

just about the sharpie hole is probably best, but consider the vent pull - it will be a little tougher to route if the blast gate is vertical.

it may very will be worth fabricating something, maybe some sort of recess to mount the vent pull.

i will be watching this.
 
#18 ·
In the pic with the mounting loc shown with a sharpie I would be concerned with the heat from the 4x4's melting the hose and possibly the gate. Maybe this will help:
Image
 
#19 · (Edited)
Jeff,

Actually, I think that your photo helps to confirm that this will work. The exit will be just slightly below the level of the lower 3/4" tube and a little outboard. My guess is that it will miss the headers by perhaps four inches....but that may be optimism.

I am hoping that someone has already installed this exact box and has a photo with the headers installed as well, but that may not be possible since FFR has yet to ship headers out with this kit. I think that I am going to have to wait until my engine and headers are installed. It really won't be any more or less difficult to install the vent at that time.

I have also looked at installing it on the engine side of the box. If I had a photo of the engine installed with this type of box, I could tell, but I am thinking that there actually may be plenty of room up that high (not on the angled piece, but on the flat side....same level as master hole approx). Any opinions? (PS...Eddie says that it is the master hole, but the masters are inside, so all I can figure is that it is for the reservoir tubes to pass through....which is what I intend for it, along with a rubber "plate" to close it off around them. Am I missing something here? What is it for otherwise?)

Oh...in answer to C Callahan: Positioning the box for the vent on the inside is very tight. The box itself could be trimmed a little, but wouldn't really accomplish much. The Sharpie circle is probably pretty representative, but I am not going to know until I have the engine and headers installed.
 
#20 ·
With the master cylinder inside the footbox, that big hole is for the front wiring harness, according to the Ron Francis wiring kit. There's a blockoff plate and a grommet that fits as well.

Image
 
#21 ·
AHA!!!! Excellent. I will use it for the resevoir lines as well if I can.

I am pretty sure that the engine side up high on the vertical surface will work. There is plenty of room behind it as well.

Anyone have a photo of an engine installed using this new box? My guess is that the vent would easily miss the valve covers (my installation is carbed, so not much protruding up there).