How well would this actually work?
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Junior User
Joined: Mar 2009
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From: Cental Fl
How well would this actually work?
So, I'm surfing CL and came across this. Kinda curious what you guys thought about an EFI intake modified to accept a 4v carb. Not sure it's anything I'd consider doing but curious about it's performance potential or lack thereof.....
300 ci 6 cyl FORD ENGINE W/ TRANS., 4 SPD. OD
300 ci 6 cyl FORD ENGINE W/ TRANS., 4 SPD. OD
Fleet Mechanic
Joined: Jul 2011
Posts: 1,916
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If I had to say anything about it, I'd say that this thing would act like a giant carburetor spacer with those long runners. Sort of like a tunnel-ram intake for our 300's.
I'd be willing to bet he bought a clifford or offenhauser intake or something similar, chopped off the top half of the EFI intake where the throttlebody bolts on and chopped the runners after the 4bbl mount on the 4bbl intake. Then he probably welded the 4bbl intake to the efi intake at the runners.
Another possibility is that he took the throttle body mounting location, chopped that off, welded the holes up shut, then machined an opening and mounting location for the 4bbl carburetor on top of the EFI manifold. I'm willing to bet that's what he did.
I think it's a really cool idea, and looks better performance wise than an Offy or Clifford intake manifold. The reason I say this is because the gas/fuel mixture looks like it could be better distributed. Combine that with possibly porting the intake and head, and opening up the head and intake runners? This would probably yield some big gains.
I'd be willing to bet he bought a clifford or offenhauser intake or something similar, chopped off the top half of the EFI intake where the throttlebody bolts on and chopped the runners after the 4bbl mount on the 4bbl intake. Then he probably welded the 4bbl intake to the efi intake at the runners.
Another possibility is that he took the throttle body mounting location, chopped that off, welded the holes up shut, then machined an opening and mounting location for the 4bbl carburetor on top of the EFI manifold. I'm willing to bet that's what he did.
I think it's a really cool idea, and looks better performance wise than an Offy or Clifford intake manifold. The reason I say this is because the gas/fuel mixture looks like it could be better distributed. Combine that with possibly porting the intake and head, and opening up the head and intake runners? This would probably yield some big gains.
Postmaster
Joined: Dec 2006
Posts: 3,603
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From: Spokane, WA
"Another possibility is that he took the throttle body mounting location, chopped that off, welded the holes up shut, then machined an opening and mounting location for the 4bbl carburetor on top of the EFI manifold. I'm willing to bet that's what he did." I think that's pretty much what happened along with using a spacer for a mount base. Interesting...I've thought of it some myself but haven't been moved to invest in the EFI intakes to try it. I'm thinking there might be a hood clearance issue.
Fleet Mechanic
Joined: Jul 2011
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There's definitely going to be a hood clearance issue if this motor were in a truck. The carburetor is mounted directly over the valve cover, then add the air cleaner, the carburetor spacer, and the intake manifold right below it, and compare that to the heights inside a stock truck, and, well...
This would probably necessitate one of those goofy looking hoods with the riser in the middle.
That Chrysler intake looks REALLY neat! I wonder how they managed to make the throttle cable for them things to work? It looks like there is a throttle cable bracket right in the middle with cables going to each carb.
This would probably necessitate one of those goofy looking hoods with the riser in the middle.
That Chrysler intake looks REALLY neat! I wonder how they managed to make the throttle cable for them things to work? It looks like there is a throttle cable bracket right in the middle with cables going to each carb.
Postmaster
Joined: Mar 2005
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From: Earth
Hmmm, why not take an EFI intake and machine/weld up the TB side to accept a couple of sidedraft Weber carbs? That would eliminate most of the hood clearance issues and look pretty trick. Or maybe use the EFI lower modded to run three downdraft Webers. A guy at FSP (FTF, iirc) posted pics of an EFI lower modded to run a pair of Holley 2-bbl carbs. Classic old school hot rodding.
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Fleet Mechanic
Joined: Jul 2011
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I was wondering about that Baron: are the EFI intakes 2-piece? I see the 6 runners going down and taking what looks like a 90* elbow to the side of the head. I assume the elbow right there is where they bolt together.
I like the side-draft Weber carburetor idea, but wouldn't want to deal with 3 carburetors, the linkages and tuning.
The 4 bbl on the EFI intake looks really cool, but the deciding factor for me would be to look at right where the planum is below the carburetor. I'd want to see how that looks and how smooth is might/should be and how well that flows. Unless he closed it up, it looks like you could make room for a second 4 bbl on top of that thing.
I've also wondered about taking an EFI 300 in like a 92 to 96 model truck, and putting 240 crank, pistons, and rods in the motor to de-stroke it to a 240 with EFI, then balance the bottom end and do a bunch of head work and add heavier injectors.
I like the side-draft Weber carburetor idea, but wouldn't want to deal with 3 carburetors, the linkages and tuning.
The 4 bbl on the EFI intake looks really cool, but the deciding factor for me would be to look at right where the planum is below the carburetor. I'd want to see how that looks and how smooth is might/should be and how well that flows. Unless he closed it up, it looks like you could make room for a second 4 bbl on top of that thing.
I've also wondered about taking an EFI 300 in like a 92 to 96 model truck, and putting 240 crank, pistons, and rods in the motor to de-stroke it to a 240 with EFI, then balance the bottom end and do a bunch of head work and add heavier injectors.
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Lead Driver
Joined: Dec 2000
Posts: 6,293
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From: South central, Minnesota
Yes the EFI intake is two piece ( Upper and Lower ) . And the EFI upper intake plenum has a divider in it. There is also a low spot in the floor of the plenum where there is a vacuum port. I cut one of these apart a couple years back just to check it out. But I didn't take any pics of it.
Here's a pic of a T-bucket with a intake set up like this.
And here's FTF's friend's intake. It's an efi lower with a fabricated plenum box on it to mount dual 2V carbs.
Postmaster
Joined: Mar 2005
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From: Earth
Thank you, Ted. I should save that pic on my hard drive for future reference. That 2x2bbl set up looks like it would be one runnin' son of a gun. And that T-bucket is freaking sweet. I'd wager it's a runner too.
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Junior User
Joined: Mar 2009
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From: Cental Fl
That fabbed upper plenum is sweet and I don't see there being a hood clearance problem with the design either unlike using the entire EFI intake. Fordman, do you know if it's been tested yet? I noticed the carb bases are angled, I'm guessing flow characteristics?
Troy
Troy
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In the first post setup, i'd worry about its ability to keep the fuel/air mixture in suspension throughout the whole length of travel...there's lots of pretty severe bends to deal with for a wet system, not to mention the box shaped plenum with the ports lifted off the floor and at a 90 degree angle. Velocity seems like it wouldn't be strong enough either..which would lead to throttle response issues....I dunno. Fuel distribution could be sketchy too..but then again...look at the 1bbl log intakes...they worked pretty good. Seems like it would be a bit soggy on the bottom at the very least. Never know though...till you try it : ) I'd like to talk to one of the folks that have actually done it and see what they came up with. Kudos to them for trying something different tho...that's where breakthroughs come from!!: )
Lead Driver
Joined: Dec 2000
Posts: 6,293
Likes: 47
From: South central, Minnesota
This has been done by a few people and works great. You just want to size the plenum right.
The carb bases are angled because the engine doesn't sit level in the engine compartment. So the bases are angled so that the carbs sit level.
Fleet Mechanic
Joined: Aug 2009
Posts: 1,771
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From: Western Washington
That 300 in the roadster is one of the prettier one's I've seen, I think the intake fits the stlye of that car. I definately wouldn't mind owning it, but I'd stuff it into something like this: Ford : Model A Ford : Model A | eBay
It would sure look better than that 350!
Sam
It would sure look better than that 350!
Sam
Elder User
Joined: Oct 2008
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I'm pretty sure the whole reason for the EFI intake manifold being what it is was to create a helmholtz resonator tuned for low RPM. But like was mentioned, carb motors might have a hard time keeping fuel in suspension compared to EFI motors with their injectors a little closer to the head. The high vacuum of most 300 camshafts would probably help a lot with that though.
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