converting a 4.0 to carb

[sledneck07]

i agree with allen, but like i said before its gonna be for a buggy so i dont want a computer to worry about getting soaked. also there has to be a way to ignite the carbed 4.0 otherwise why would s manufacture waste time making an intake? gotta rember their out there to make a buck and wasting money on molds, labor and ect is pointless if their product is useless.

 

[AllanD]

It's easier to snorkel an EFI engine and even waterproofing the electronics isn't particularly difficult...

Various products made bby Rubbermaid and Tupperware lend themselves beautifully to being "waterproof" conpainers, though their original designers intended them to keep water IN they work quite well at keeping it out too.

a coil pack ignition is pretty much immune to water/mud presuming you foll the boots and terminal towers with silicone grease during assembly

(something filled with waterproof grease won't fill with Water)

Frankly I think you are just looking at the problem the wrong way around

 

[farmer]

ok so everyone has voiced their opinion against going carb'd, but he still would like info on it. He wants to do something different, let him, it's his money to spend. Does anyone have anything to add that isn't just "don't do carb"?

 

[Hahnsb2]

ok so everyone has voiced their opinion against going carb'd, but he still would like info on it. He wants to do something different, let him, it's his money to spend. Does anyone have anything to add that isn't just "don't do carb"?

This has been discussed many times, it's just not feasible. If you want a carb get a 2.8 or a 5.0.

 

[cammeddrz]

i dont want to deal with the efi sensors and the masses of wire

my efi has 2 sensors (throttle position, and coolant temp) and 6 wires

oh and tuning mine is about a billion times easier than tuning a carb too.

so i hate this efi crap with a passion

don't worry its human nature to hate what you know very little about, and do not understand


the irony is that i posted a thread on this same subject over on a bronco ii board a year ago, i said just about the same things you did, but since then have learned

*edit i found that thread, and have seen the error of my ways (man i was an idiot): http://broncoii.org/forum/index.php?topic=9271.0

 

[farmer]

This has been discussed many times, it's just not feasible. If you want a carb get a 2.8 or a 5.0.

so why do they make a carb intake for a 4.0?

 

[Big Jim M]

huh?

so why do they make a carb intake for a 4.0?

Who does?
Big JIm

 

[farmer]

a link from the tech library < click it, its a link foo

 

[feellnfroggy]

They make fuel injected carberatuers if i remember correctly and the 4.0 is one of the more common low cost baja motors. Its carberated but fuel injected. I couldnt give you details to save my own live. COil packs and allthat but with a carb on top.

 

[sledneck07]

thanks farmer for stickin your neck out sorta say, and the efi carb is called throttle body injecton, ford hasnt used it (i dont think) but chevy and dodge were big on using them, as to not understanding, i understand the efi systen well but life farmer said i wanna do something diff, if anything i could run a cold air to the carb incorperating the maf, and hooking up a tps to the carb. in my mind carbs sound a heck of a lot better than efi especally when the secondaries open up

 

[cammeddrz]

ford hasnt used it

yes ford has. in fact a couple guys here retrofitted the ford tbi onto 2.8's

for whatever reason it really seems like you want to carb this thing......so just do it. stuff your truck inside a DeLorean and send it back in time to 1978.

but it won't change the fact that other than not having to wire it, there is no benefit to a carb over efi.

in order to do it you'll need a stand alone ignition management system, and the carb manifold. it won't be that difficult

 

[AllanD]

What about if I wanted to upgrade from my very tired 2.9 to a 4.0. From what I've read so far everything will swap over with the small issue of the starter. The 4.0 uses a bigger flywheel/clutch as well as I understand as well. I was hoping that a 2.9 distributor/cam would work in the 4.0 so I wouldn't have to make any wiring changes other than the starter. I was thinking if one used the 2.9 cam (if it fits, and the spec's aren't too different) than you might be able to used the distributor. Since the truck came with the distributor set up then the wiring would still work as well. What's the Major difference between the two engines with respect to the cams. I was thinking that the oil drive that sits in place of the distributor might just be a easy swap, but I guess not........



David

Swapping to a 4.0 and keeping the TFI distributor ignition is like
paying for an expensive hooker then ignoring her while you watch a taped baseball game and stuff cheetos in your face and wash then down with warm skunky beer...

The "wiring" isn't THAT big a deal... (it's more tedious than intellectually challenging) and frankly the two systems basically function (and are wired) very similarly...

If you actually look at the two ignition system diagrams in an
EVTM manual long enough it will hit you that the main difference
(Aside from the coil pack itself) that most of the wiring differences
are due to moving the various components around the engine bay.

Distributors can get wet inside the cap, TFI modules fail often, EDIS modules fail very rarely.

Frankly switching to a 4.0 is entirely justifed JUST for it's superior (reliability) ignition system. the additional torque and more truck like power band are simply icing on the cake...

As for the 4.0 starter/flywheel/clutch?

It all bolts right up to a 2.9, and many have done exactly that...

AD

 

[Hahnsb2]

so why do they make a carb intake for a 4.0?

Didn't say it wasn't possible, it just isn't feasible. You're just going to be solving problems that didn't need to exist in the first place.

 

[cammeddrz]

and just to be clear they don't make a carb manifold, the manifold that you see made by tom morana racing is just a stock 4.0 intake that had the top cut off and a carb plate welded to it

 

[farmer]

Didn't say it wasn't possible, it just isn't feasible. You're just going to be solving problems that didn't need to exist in the first place.

that doesn't answer the question. why would a company sell a product, and risk losing money, if it was totally useless and unuseable