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Thread: 4AGE and 4AGZE bottom end differences... Please help!

  1. #1
    Senior Member jet111's Avatar
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    Default 4AGE and 4AGZE bottom end differences... Please help!

    Well I broke my engine the other night (did a bottom end bearing) and this seems like a good excuse for a rebuild.

    I am currently running a stock JDM 4AGE 16v and I want to do it up so it can handle a little bit of boost, however I will be running it Naturally Aspirated for a while.

    My question is: What are the differences between the JDM 4AGE and 4AGZE bottom end besides pistons?

    Will I be able to run a 4AZGE bottom end with all my gear from the JDM 4AGE 16v? (head, throttle body, stock ECU, etc…)

    Keep in mind that I will be running this naturally aspirated for a while, obviously components will have to change once I supercharge it.

    Will I be able to bolt the 4AGZE bottom end onto my existing head without any dramas?

    I am pretty new to these engines so any info would be appreciated.

    Cheers.
    Last edited by jet111; 9th February 2009 at 05:31 PM.

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    Veteran Golberg's Avatar
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    Yes you're head will bolt onto a GZE bottom end, but its a shit idea to run it without any boost. Will run worse than your 4AGE

    The only drama you may have with the bolt together would be the oil drain at the back of the head. If its anything other than MR2 GZE you will have to block up the drain hole on the block.

  3. #3
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    Between YOUR version of the 4AGE and a 4AGZE: everything is different

    4AGZE crank has larger journals, the block itself is much stronger (7-rib), the conrods are much larger, and the wrist pins are also larger (20mm instead of 18)

    Your best bet would be to get a smallport bottom end (same as the GZE, except pistons) which will be great fun while NA, then when you decide to boost it throw in some GZE pistons

    And yes you can use all your JDM 4AGE Head/water/alternator stuff

    When you go GZE your JDM ecu will not cope

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    Senior Member Hen may possibly be a nut's Avatar
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    ^^^^ = Correct

    But bear in mind that the main difference is between the generation of 4A you have (early, small bearings, 3 rib block etc etc), and the later generations of 4A. Not the 4AGE vs 4AGZE differences (they are minimal for a given build year).

    Hen

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    Senior Member jet111's Avatar
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    Awesome, that is a big help... Ill start looking for a smallport bottom end. How many pounds / how much power can you safely run on stock conrods, are they worth replacing?

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    Senior Member Hen may possibly be a nut's Avatar
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    Your rods will not be the weak point. In my opinion, they are common between GE and GZE, though some will disagree.

    If you've got the engine open, you could replace the rod bolts with something good, but don't worry about the rods themselves.

    Hen

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    I'd happily run AE92 Smallport/4AGZE rods (the same) to 250kw/atw every day

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    running a ze na, while you plan/save to go turbo/ze is not a bad idea at all. its been done before plenty.

    if you get a late one, you will need a big port to small port adapter, and thats all, to run it on you big port engine management.

    the only difference is a touch of compression and cam timing. you will hardly notice it. if your old engine let go, it was probably on its way out, and not making full power anyway.

    a fresh import ze will match a worn out old big port i think.

  9. #9
    Senior Member jet111's Avatar
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    I have a better idea of what I am looking for now... Thanks for all your help, the searching for a GZE block begins.
    Last edited by jet111; 10th February 2009 at 07:32 PM.

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