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4.3 chevy guys??

Discussion in 'Early CJ5 and CJ6 Tech' started by gte636p, Apr 23, 2006.

  1. Apr 23, 2006
    gte636p

    gte636p Member

    smyrna, Ga
    Joined:
    Sep 23, 2002
    Messages:
    492
    alright, my cj bit the dust last night while driving it to a friends house to work on it. it seems as though the head gasket called it quits and sent anitfreeze all over the place under the hood, and my case of "while i'm at it" would have me rebuild the engine... it's 35 years old without any work done on it, i might as well have the head reworked, but then the heads wouldn't be the same anymore; might as well take the other one off to get the compression on the banks somewhat even, since everything is taken somewhat apart right now it seems like a waste to have reworked heads but have blow-by on the pistons, etc. etc.

    so, before i proceed, i've read the writeups on 4.3 swaps, and i know i could get it done in a decent amount of time, but i don't know the real problems that were faced when performing the swap. i'm looking at using a sm465 that i've got with it and keeping the d18 xfer case... so the whole drivetrain seems to be changing. if anyone could let me know the finer points that would suck funds and time that you wouldn't think about to help me decide between the 4.3 or a fresh 225 i'd be more than thankfull, along with the power difference and fuel savings from switching to fuel injection... i've got alot to think about in the coming weeks concerning this. and needless to say, i'm out of windrock now..
     
  2. May 1, 2006
    mudhound

    mudhound member

    Nor Cal
    Joined:
    Apr 2, 2006
    Messages:
    8
    Im doing the same swap in a 57 cj. I got the novack adapter to a sm465/dana18 $500+ and now wiring the engine has me cursing. Im tring to use the origanal harness to save $. other than cost I don't see a problem with it. I don't think people are fond of swaps.
     
  3. May 1, 2006
    neptco19

    neptco19 That guy....

    Athens, GA
    Joined:
    Sep 26, 2003
    Messages:
    1,381
    Are you wanting to go with a FI 4.3 or a carbed?? Your going to need a wiring harness, elec fuel pump, radiator. Then your going to need all the stuff associated with the clutch. Also going to need a bellhousing, trans crossmember made, motor mounts welded in. Possibly some firewall triming depending on engine placememnt. Now depending on if you get a donor vehicle for the swap you can rob alot of parts off it, if not you'll need to do alot of hunting of parts. I put all the pt numebrs I used in the write up I did for the site in the tech section so that will help get you started.
     
  4. May 1, 2006
    mudhound

    mudhound member

    Nor Cal
    Joined:
    Apr 2, 2006
    Messages:
    8
    1995 TBI vin"Z" I have all the other stuff, But I am having trouble with a harness. I should have a TBI but I have been told it is'nt or can't be is it possible that I have a older motor. It has a TBI system, looks like a electric carb. If so can I use painless 60101
     
  5. May 1, 2006
    mudhound

    mudhound member

    Nor Cal
    Joined:
    Apr 2, 2006
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    8
    Thanks for your pt # I have looked at your info many times
     
  6. May 1, 2006
    neptco19

    neptco19 That guy....

    Athens, GA
    Joined:
    Sep 26, 2003
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    1,381
    I believe they stopped using the TBI system in 92 or 93.... let me look I think I may have a wiring schematic that might help though
     
  7. May 1, 2006
    neptco19

    neptco19 That guy....

    Athens, GA
    Joined:
    Sep 26, 2003
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    1,381
  8. May 1, 2006
    mudhound

    mudhound member

    Nor Cal
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    Apr 2, 2006
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    8
    Thanks life saver:beer: :flag:
    My main consern is Smog. I dont need it but I dont think the ecm will work right without it
     
  9. May 2, 2006
    mortten

    mortten I can’t put my finger on it 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Peninsula, Ohio
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    Apr 17, 2006
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    A 1995 should have central sequencial fuel injection (CSFI), not TBI. TBI could have been swapped in or it's an older engine. I have an Astro manual with the different diagrams for the different systems. I can scan them if that would help.
     
  10. May 2, 2006
    mortten

    mortten I can’t put my finger on it 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Peninsula, Ohio
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    Contact this guy. He may be able to burn you a chip that shuts off the smog stuff and make the computer work right for what you want to do.
    http://www.customefis.com
     
  11. May 2, 2006
    Corveeper

    Corveeper Member

    Chanute, Kansas
    Joined:
    Jul 29, 2005
    Messages:
    817
    Not necessarily, my ’95 S-10 has the 4.3 with TBI.
    The TPI came in with the “Vortec” engines, IIRC.
     
  12. May 2, 2006
    mudhound

    mudhound member

    Nor Cal
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    Apr 2, 2006
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    the full size C series trucks came with a vortec 4.3 TBI system. At least thats what my oem manual says.
     
  13. May 3, 2006
    mortten

    mortten I can’t put my finger on it 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Peninsula, Ohio
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    Must have been just the Astro's that changed in 95
     
  14. May 3, 2006
    jplumb

    jplumb Her tractor first, now...

    Haxtun, Colorado
    Joined:
    Apr 18, 2006
    Messages:
    35
    I am going to attempt the same swap in my '59 cj5. All the guys around here claim the carbed motor is the way to go because for the dollars you don't get the much improvement with the fuel injection. Depending on the tranny and transfer case you use, you may need a different flywheel and clutch, bell housing, adapters for the tranny/trans etc. I am beginning to get a little nervous from the sounds of the wiring headaches though!!!!! Good luck, I will keep checking to see what I am missing. Glad to know there are others out there doing the same thing!!!!!!!!
     
  15. May 3, 2006
    Boyink

    Boyink Super Moderator Staff Member

    Tulsa, OK
    Joined:
    Sep 20, 2002
    Messages:
    6,193
    :shock:

    What types of improvement are they not getting? I can't wait to dump the carb for FI on my 4.3...it was the whole point of going with the engine to begin with.
     
  16. May 3, 2006
    mortten

    mortten I can’t put my finger on it 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Peninsula, Ohio
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    I don't know, I like spending hours setting timing, points, floats, mixture, lubing choke cables, etc. NOT:)
     
  17. May 3, 2006
    Boyink

    Boyink Super Moderator Staff Member

    Tulsa, OK
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    Sep 20, 2002
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    That and fighting flooding carbs on inclines, cold-weather starting, etc...
     
  18. May 3, 2006
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529

    Amen Brotha!
    Don't forget lack of performance with altitude changes, higher emissions (I like my breathing air to be clean thank you), more maintenance, etc.
    Nickmil
     
  19. May 3, 2006
    jplumb

    jplumb Her tractor first, now...

    Haxtun, Colorado
    Joined:
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    Messages:
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    I agree with the thought of not having to constantly tune on a carb. I am just saying that the mechanic guy here in town said...I repeat he said...that the cost difference to buy a fuel injected over arbed was significant (like double) by the time you get all of the wiring, computer, etc. Don't know for sure, just going off what he said. So I guess my question to you guys then is what do you need to get rid of the carb and put on fuel injection? Obviously the manifold is going to be different etc. but what do you do with the wiring and computer etc.?
     
  20. May 3, 2006
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
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    12,529
    If you have to buy the pieces individually, then yes it's more expensive. I'd buy a wrecked S-10, Astro van, or something similar for cheap and then you get all the wiring, computer, brackets, mounts, yada, yada, yada. I recently passed up a running a driving Astro van locally in good running shape for $500, but didn't need it. If you already have a motor, then a used Holley Projection would probably be the best bet unless you can buy a vehicle with a bad motor that already has everything you need. I guess I'm saying if you are starting from scratch, then buy a complete set up. If you have the motor already and it's carbed, then there are still inexpensive options out there to get FI. Another thing to think about, most carbed 4.3's were computer controlled. That means you're gonna have to find a non-computer carb that's in good shape or buy new, and change out the distributor for a non computer version. By the time you spend that kind of money you should be able to get a complete running motor with everything used for not much more. Of course, there are always incidental costs when doing a swap like this, but no swap is without cost. Nickmil.
     
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