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Old 12-30-2010, 11:18 PM   #1
67galax
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302/5.0 efi to carb swap

first off, i would have put this in the 80-96 tech section, but i don't have enough posts to do so. also, i've done a VERY quick search and didn't see anything like what i'm thinking about. so here goes...

has anyone ever considered doing an EFI to carb swap on a 5.0 motor, but keep the lower EFI intake? what i'm thinking is, custom build an upper intake with ports to match the lower efi intake, but adapt it to fit a 4bbl or 2bbl carb? i know that i'd have to have a fuel pressure regulator inline to turn down the psi on the fuel, and i'd probably need all types of electrical rerouting to get around the computer (trans, ignition, etc).

what i'm looking for is a reversible way to have a carbed 5.0 motor in my bronco, without really tearing into any 'wet' gaskets, and be able to swap it back to EFI once a year whenever emissions inspection comes calling, or if there were ever an event where my stock computer was fried and i needed the good old-fashioned carb to get my motor to run.

please don't beat me up too bad on this. just wondering if anyone has ever had a similar thought.
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Old 12-31-2010, 01:41 AM   #2
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What do you have to gain? Like, what on earth do you have to gain?

SEFI(what you have)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>Speed Density EFI(what my 92 has)>>>>>>>>>>>>>>>>>>>>>>>TBI(primitive, crappy EFI)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>carburettor.

Carbs suck. They use more fuel, pollute more, make less power, are a total bitch to start when it's -10*F out, and need to be tuned. EFI uses less fuel, pollutes less, makes more power, more easily, starts like a charm no matter the weather, and you NEVER have to tune it.

Why go carb?
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Old 12-31-2010, 02:14 AM   #3
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OK, lincoln, you obviously don't get it. i'm asking if anyone has ever tried efi to carb, not what you think about this particular idea.

if TSHTF, and my computer didn't work, would anyone have a setup ready to run without a computer, without having to change the lower intake to make your bronco run.

if anyone understands and wants to comment, i'm all ears.
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Old 12-31-2010, 03:13 AM   #4
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Originally Posted by 67galax View Post
OK, lincoln, you obviously don't get it. i'm asking if anyone has ever tried efi to carb, not what you think about this particular idea.

if TSHTF, and my computer didn't work, would anyone have a setup ready to run without a computer, without having to change the lower intake to make your bronco run.

if anyone understands and wants to comment, i'm all ears.
That's actually pretty cool idea. Pretty ingenious concept. When TSHTF and we get an EMT strike, were all fawked because of the hordes of electrical bullshit in these rigs...
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Old 12-31-2010, 03:22 AM   #5
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That's actually pretty cool idea. Pretty ingenious concept. When TSHTF and we get an EMT strike, were all fawked because of the hordes of electrical bullshit in these rigs...
That electrical bullshit also controls the ignition, but I have yet to see someone go back to mechanical ignition in one of these trucks. Most realized decades ago that it's just not as good.
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Old 12-31-2010, 03:23 AM   #6
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Originally Posted by 67galax View Post
OK, lincoln, you obviously don't get it. i'm asking if anyone has ever tried efi to carb, not what you think about this particular idea.

if TSHTF, and my computer didn't work, would anyone have a setup ready to run without a computer, without having to change the lower intake to make your bronco run.

if anyone understands and wants to comment, i'm all ears.
this isn't fawking zombieland dude.
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Old 12-31-2010, 03:33 AM   #7
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Honestly? Go to a junkyard and pull a computer. How much is a decent carb, like $700? You can get BRAND NEW computers at rockauto.com for like $150 shipped!
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Old 12-31-2010, 09:43 AM   #8
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Not easiely possible... It'd be easier, cheaper, and more practical for you to keep 5 computers in the back, before you attempt this.

First, nobody makes an upper that'll bolt to your lower for easy EFI to Carb swap. So you'll have to get wet by swapping the whole intake.

Second, you trans is controlled by your computer... if your ECM's fried, you're not shifting either. So you'd have to swap your trans for a C6, AOD, or stick.
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Old 12-31-2010, 10:35 AM   #9
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I moved it for you. And going EFI to Carb is not worth it. you will spend 1,000's to do so, then your talking about putting all the EFI stuff back on to pass emissions. Totally not worth it.
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Old 12-31-2010, 10:49 AM   #10
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I've thought about useing a EFI lower intake and making my own upper for a multi carb setup... It would be a nice high rise compaired to any carb intake...

But mine would be for a 302 goin into a 37 Ford pickup that I'm making a rat rod out of.. I have all these extra parts I can fit together so might as well lol
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Old 12-31-2010, 12:47 PM   #11
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I've thought about useing a EFI lower intake and making my own upper for a multi carb setup... It would be a nice high rise compaired to any carb intake...

But mine would be for a 302 goin into a 37 Ford pickup that I'm making a rat rod out of.. I have all these extra parts I can fit together so might as well lol
Very cool. I knew a guy who did just that with a early Ford PU ( 39 iirc ) setup as a NA drag truck, but he use a inglese manifold and stuck some weber carbs on it. A bitch to syncronize the linkage, but it ran like a bitch when it was tunned correctly.


I think he spent like 2K in carbs alone and the manifold was way over 900 dollars and are rare.
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Old 12-31-2010, 11:37 PM   #12
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Originally Posted by 92Custom View Post
What do you have to gain? Like, what on earth do you have to gain?

SEFI(what you have)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>Speed Density EFI(what my 92 has)>>>>>>>>>>>>>>>>>>>>>>>TBI(primitive, crappy EFI)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>carburettor.

Carbs suck. They use more fuel, pollute more, make less power, are a total bitch to start when it's -10*F out, and need to be tuned. EFI uses less fuel, pollutes less, makes more power, more easily, starts like a charm no matter the weather, and you NEVER have to tune it.

Why go carb?
Hmmmm...make less power, has to be tuned, hard to start? Hmmmm...once it is tuned correctly, there is no problem. None the less, even with me liking the carbs, I think this is a REALLY bad idea. Get it fixed right.

SWS
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Old 01-01-2011, 10:54 AM   #13
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I will add is this:

With SOM much HELP and INFO on the THIS site and web EFI is easy as pie to fix/tune compared to years ago.

Fireguy50 has some killer tech on there site, so get reading.
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Old 01-01-2011, 03:45 PM   #14
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Hmmmm...make less power, has to be tuned, hard to start? Hmmmm...once it is tuned correctly, there is no problem. None the less, even with me liking the carbs, I think this is a REALLY bad idea. Get it fixed right.

SWS
Around here the annual temperature range can be from -10*F to 110*F. If you want to make a road trip west and through the rockies, watch the elevation climb quite dramatically. Elevation and temperature changes are things EFI can compensate for as it happens. Carbs...not so much.
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Old 01-01-2011, 03:59 PM   #15
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it would cost more for you to get this running from EFI to carb, than it would cost for chevy guys to switch from TBI to MPFI.

Get a new computer for 150 and be done. If you want more power, get in touch with some good SCT retailers who also offer some good canned tunes.
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Old 01-01-2011, 04:41 PM   #16
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I talked myself out of this route but you could fab up a box that the carb could bolt to. A new carb is gonna be around $400 with electric choke but I am under the impression that the old Q-jet works pretty good off-road so that could be cheaper, you could drop in a GM hei Ford conversion distrubutor or make a little duraspark distributor pack. In your particular case your still screwed because you have the E4OD so you'll need a controller for it. Like others have said your just throwing good money at an easy fix that is already capable of being reliable most of the time. Finding good ignition parts is the key to happiness on mine because everthing else seems to work just fine. Good luck
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