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420a swap

Posted by Ryan Richards, Feb 8, 2018

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  1. Ryan Richards

    Ryan Richards Probationary Member

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    So some back story I had a 2003 eclipse gs I was working towards making a beauty but unfortunately she got T-boned and now sits in my driveway unfortunately without doing much research I bought a 99 eclipse gs thinking I could drop a 4g63 after doing some research around here I have found that is not quite as simple as I thought. But I have found that a 4g63 from a Evo 8 is also a left Bayside engine which leads me to the question of will my engine from my 03 gs with the Evo 8 head swap will bolt into the 99 gs?
     

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  2. chrysler kid

    chrysler kid Proven Member

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    It will require extensive modifications and custom engine mounts. It will not "just bolt in"
     

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    1998 Mitsubishi Eclipse GST
    fwd · automatic · 2G DSM

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    1996 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM

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    1996 Mitsubishi Eclipse GST
    14.1 @ 97 · 2G DSM
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  3. joemamma

    joemamma Proven Member

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    williston, North Dakota
    no where near a bolt on-might be easier to go with an ls engine swap(kidding), but really you would be ahead of the game by selling what you have and buying the car with engine in it already
     

    Drag Race Build 912  1

    1992 Mitsubishi Eclipse GSX
    manual · 2G DSM

    Street Build 716  2

    1994 Eagle Talon TSi AWD
    manual · 1G DSM
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  4. Tanro

    Tanro Proven Member

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    Montgomery, Alabama
    1dxet4.jpg

    Its almost as easy a bolt in. 3/4 engine mounts line up using an evo 8 engine and trans.

    The 4th (the top trans mount) just needs to be hogged out some.

    hautze77-img600x450-11862056979-11-jpg.jpg
    2530563345_8124c387ee_o.jpg

    1-420a-harness-still-in-jpg.jpg
    image5-jpg.jpg
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    ZKDDGIT.jpg

    This swap is only gonna get more popular as clean unmolested GST and GSXs get harder to find and cheap unwanted 420a cars get more desperate for homes. Also prices are dropping on Sirius II 4g63 engines currently. Hard to say when prices on S2 4g63s will bottom out as they do make good swaps for 3rd gens, probably 4th gens. Lancers, and Mirages. Probably some galants too. Along with the people using them in RWD setups.

    The hard part is gonna be electrical, but thats not hard compared to fabricating a bunch of sh** no one makes. You only need about 40$ worth of tools and an electrical manual to get that tracking.

    You can use a 3g trans. Might need to do some google searching on cv axles people have used. But you can also make it AWD with a 2g rear subframe, evo 8 t-case and trans, and a 2g AUTOMATIC awd rear diff. Only the AUTO was also available as a gear ratio for the evo.

    270414_185806788147524_1539870_n.jpg
     
    Last edited: Feb 9, 2018

    Street Build 2K  10

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  5. dsmcrzy

    dsmcrzy Proven Member

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    Trenton, Ohio
    Trans mount does not need to be hogged out... it needs to be cut off and moved forward.

    OP this swap is not for newbs and you won’t find all the information you need on the web. The guys that have done this swap have shared pics, but have kept everything close to their hip.
     

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  6. Tanro

    Tanro Proven Member

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    Yeah I found one guy that moved it, but I swear another guy just widened the bolt hole when I first heard of this swap being feasible 7/8 years ago. Lots more guys have done it now. Reach out to them to see what they did.

    No I wouldn't recommend this swap to someone with no tools, and just starting out. I'd recommend a good job and house first. But is feasible, its not a hard swap if you're willing to search and find solutions to problems.
     

    Street Build 2K  10

    1999 Mitsubishi Eclipse GST
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  7. chrysler kid

    chrysler kid Proven Member

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    So step 1 is post on a forum to have some one else tell you how to do anything. The OP Is well on his way thanks to your guidance . ROFL

    It would be easier to swap a 3rd gen base model with a manual trans. It's almost plug and play, compared to an LS swap :sneaky:
     

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    1998 Mitsubishi Eclipse GST
    fwd · automatic · 2G DSM

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    1996 Mitsubishi Eclipse GST
    14.1 @ 97 · 2G DSM
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    dsmcrzy likes this.
  8. cmrg95

    cmrg95 Probationary Member

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    Long Beach, California
    If you want go with a cheaper option you can also get a Sirius II 4g64 block and get a 4g64 DOHC head from a Kia optima/Hyundai sonata. You can use forged internals for the block. As for the head you can use evo 8 internals. The evo intake and exhaust can bolt on to the head. Use a 3g fwd transmission. Check out 3g forums and evo forums. They have loads of information on 4g64 swaps. Check out @99 OZ Edition dsm build thread.
     
    Last edited: Feb 9, 2018
  9. Vegas smith

    Vegas smith Proven Member

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    Gives me a headache reading these Frankenstein engine swap threads.
     

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  10. techboy

    techboy Proven Member

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    Lehigh Valley, Pennsylvania
    When I sold my turbo'd 420A back in 05 guys on the forum I belonged to at the time were getting all excited about the Neon Srt4 motor being swapped into these cars. I got out so I don't know ... did that ever become a viable option?
     

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  11. Tanro

    Tanro Proven Member

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    Different block. Can swap the srt4 internals into the 420a or go the full on fab route. Def still easier to either move the mount, or widen it.
     

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  12. Tanro

    Tanro Proven Member

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    http://repo.jackmoves.com/v/shawn/Eclipse/evo_swap/parts/

    This guy moved the mount.

    The red car from taiwan that was the first car widely talked about on the net apparently used a 420a trans with a swapped bellhousing. That one just used the stock trans mount.

    Edit: To be clear, I don't the validity of swapping the bellhousing on the 420a trans.
    Probably be easier to use a 3rd gen trans.
     

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  13. dsmcrzy

    dsmcrzy Proven Member

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    Please stop spreading wrong information. SRT4 internals do not fit in the 420a block. This has been known for a long time. The rods are too long and do not bolt onto the 420a crank. There are several other reasons they do not fit. The SRT4 internals do work in the 2.4L found in the cloud cars.
     

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  14. Ryan Richards

    Ryan Richards Probationary Member

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    Tanro
    Yes I was looking into a Evo 8 swap but I don't have the rest of the engine block just the head which is neatly placed on my 4g64 which is why I was wondering if the 4g64 would work, but are you saying I would have to pick up a Evo trans and t-case because a eagles wouldn't bolt on to the 64?
     
  15. dsmcrzy

    dsmcrzy Proven Member

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    Street Build 3K  12

    1996 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  16. Ryan Richards

    Ryan Richards Probationary Member

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  17. Ryan Richards

    Ryan Richards Probationary Member

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    My Evo head is already on a 4g64 inside a 3g that is in my driveway T-boned hence why I was wondering about the compatibility
     
  18. rstoevo

    rstoevo Probationary Member

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    Lol my motor is on this web awesome
     

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  19. rstoevo

    rstoevo Probationary Member

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    I have a ? For all of your who is good in wiring and would like to gave me a hand.
    I am the rs to evo and awd swap as well.

    This is my fb page if you what to message me.
    https://www.facebook.com/boricua7777
     

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    4G63 1997 rs
    manual · 4G63t Swapped

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  20. t3turbogs

    t3turbogs Probationary Member

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    I always wondered if you could swap the 4g 3.8 in a GS. I've seen a 3g 3.0in a 2g. And a 3.8 in a 3g.
     

    450  1

    1997 Mitsubishi Eclipse GSX
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