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switching an 89 318 efi to carb questions

Discussion in 'Vans' started by ati2ude78, Jul 25, 2015.

  1. ati2ude78

    ati2ude78 Member

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    hi all,
    I am brand new on here. I have a very new dodge truck and Chrysler 300 and love them. so I went out and bought an old 89 b350 van with the 318 efi. I want to switch to a older style carb setup to keep it simple and get rid of all the emissions stuff. this is a rig that I won't be driving often as I am building a boondocking campervan out of it. I am not completely green when it comes to engines but I am to the 318 motor. obviously I will need a new intake out of a donor along with a fuel.pressure regulator. but unsure about transmission issues with the automatic I already have and stuff like that. any help would be awesome.
    thanks
     
  2. ImperialCrown

    ImperialCrown Moderator
    Level III Supporter

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    Welcome to Allpar. The carburetor system would actually have more 'emissions stuff and vacuum hoses' than the EFI system and generally give poorer driveability. A carburetor set-up would be a big step backwards IMHO. Not only the intake, but the wiring harness, heads and fuel tank/lines are different also. You would almost want a non-EFI (pre-1988) parts donor van to do this.
    You would be better off getting the EFI system working well. Any fault codes? What symptoms are you having?
     
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  3. valiant67

    valiant67 ...

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    A lot is going to depend on the transmission. If it's the old 3 speed the only electronic issue is the lockup. But if you have the OD then both OD and lockup are computer controlled.
     
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  4. dana44

    Ad-Free Member

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    You do have throttle body injection in 1989, so it is the simplest system to start with as far as injection goes. And although I don't overly like getting rid of a good system overall, I understand what you want to do and can understand the simplicity you are searching for. That said, you will need to get ahold of one of the aftermarket transmission companies, there is wiring and switches to put one of these transmissions behind older engines to have overdrive, so it can be worked around. Although the injector intakes are not highly capable in the flow numbers, a good dual plane 2 or 4bbl manifold and carb, a distributor with vacuum advance and the electronic controls to operate it (or aftermarket has one wire/limited wire distributors), and a fuel regulator to go from 14psi for the TBI down to 4-6psi. Lot of money, easier to keep what you have.
     
  5. bguy

    bguy Well-Known Member

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    I have to ask, whaffor?
    If it runs like it is, even if it needs repair, you are IMO much farther ahead with the SBEC/EFI.
    To me this makes about as much sense as taking the helper leaves out of the rear end.
     
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  6. pt006

    pt006 Active Member

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    ati2; what you are asking about is illegal in many states and probably illegal as a federal law too! [catalytic converter; etc.]
     
  7. pt006

    pt006 Active Member

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    bguy; I added helper leaves to my rear end. I used peppermint leaves. Why? Because I wanted my wife to call me a sweet guy.
     

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