That's pretty good thinking, Day.  But, I suspect you will have a lot of air/fuel separation by the time the mixture get to the port. 
Let us know how that works.

BB1

While I appreciate your engineering my thoughts simply put are: kill it before it grows. 

Daze...I bet it’ll work just fine.
Offy’s four barrel intake for 300 cid is similar.

The efi intake is designed better if you look at the intake design.
After the carb, air travels to the common plenum ( part above valve  covers).
This section sees vacuum from all 8 cylinders.
Then there is a short section from the plenum to each cylinder.

That’s cool to adapt that for your test stand and then you don’t have to disassemble after testing.
I like that idea.
Is that why you made it?

The only suggestion I have is to blend the elbow to the carb base adapter.
Or make a drop in adapter to smooth the transition to elbow.

Last edited by Nos681 (4/07/2020 11:04 AM)

MS wrote:

Always wondered how that would work with a Weber carb bolted straight out the side.

 
Yeah Steve,  a Weber side draft or even those funky SU’s, although one might not be enough cfm.

Make a shaker hood😁

TKOPerformance wrote:

Toss the upper intake and make an adapter/ small plenum for the lower intake that accepts three Strombergs.  Now that's retro!

 
Now that is a novel idea. It certainly arouses my curiosity.

Rudi wrote:

TKOPerformance wrote:

Toss the upper intake and make an adapter/ small plenum for the lower intake that accepts three Strombergs.  Now that's retro!

 
Now that is a novel idea. It certainly arouses my curiosity.

I have a stock 5.0 EFI intake on a shelf in my shop...

TKOPerformance wrote:

Rudi wrote:

TKOPerformance wrote:

Toss the upper intake and make an adapter/ small plenum for the lower intake that accepts three Strombergs.  Now that's retro!

 
Now that is a novel idea. It certainly arouses my curiosity.

I have a stock 5.0 EFI intake on a shelf in my shop...

Yup, me too.  There was a fellow near Corky who went by AT on here a couple of years ago.  He had a stock SD system on his early Mustang running with the TB bolted to a long, relatively shallow plenum that was bolted directly to the lower intake.  Said it ran just fine.


BB1

Make or cut a funnel to smooth the transition.
Cheap and simple.

UPDATE 2.0... Epic fail

I got a bit of a surprise today.  I pulled the upper intake to tighten the lower intake bolts and begin putting the terminator X parts on and when I tilted the intake to unplug vacuum lines about 1/4 cup of fuel pored out.  This was a huge surprise because of how well it had run.  Bullet Bob, gets the prize for the correct prediction:

Bullet Bob wrote:

I suspect you will have a lot of air/fuel separation by the time the mixture get to the port. 
BB1

I had run it for about 10-15 minutes yesterday and in that short time that much fuel had pooled up.  I am a little confused though, I was told that running EFI ment my fingers wouldn't stink like fuel  
 

The runners are just too long and not designed for wet flow.  That fuel was falling out of suspension, sticking to the intake walls, running down, and pooling in the plenum.  The air makes a 90 degree bend in that intake, but its a convoluted 90 degrees.  Really, it deadheads, makes a 180 degree turn, then drops down.  That deadhead/180 is your problem.  The mixture is slamming into the wall and the fuel is falling out of suspension.  With just air the air does the same thing, but this creates an area of high pressure in the plenum, which them gets drawn into the lower intake by the low pressure created by the cylinders on the intake stroke. 

Over the years I've heard guys say that air and liquid behave the same, so you can mock up airflow based on the principles of fluid dynamics.  Its simply not true, especially when dealing with an air/fuel mixture, which is not a fluid, nor a gas, but a gas containing an atomized fluid.  Such behavior is not easily predicted based on fluid modeling because of how the fluid part of the mix behaves when confronted with an obstruction. 

The fuel was in the upper intake in the common chamber?