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Thread: 4AGZE Build/Rebuild

  1. #1
    Forum Member 1st year Apprentice
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    Default 4AGZE Build/Rebuild

    Apologies for the lengthy post and ...... **Amateur alert**

    - Blew the headgasket in my 4AGZE Ta22.
    - Off to the mechanic as time was an issue and figured i'll learn "next time".
    - Bad news. Head in bad shape and block not looking great.
    This is a Bigport 4AGZE





    I have read through the complete build QuikSilv's thread (Well worth a look for any 4AGZE owner!) http://www.toymods.org.au/forums/thr...=4agze+rebuild

    After all this i have a few questions for anyone willing to chip in

    Basically I'm looking at doing a rebuild. Once the head specialist poked around a bit and cleaned off a section finding gunk that may have been chemiweld or the like(must have been slightly blown when i bought it years ago) He said it's definitely repairable. He will be repairing the head and reconditioning it. The block will be decked and dipped.

    *** The end product i am hoping for is a 4agze running MRP's boost crank pulley set up @ approx 14PSI.***
    https://www.mrpltd.co.nz/product/4ag...st-pulley-kit/

    I will be putting ARP bolts/studs throughout , full gasket kit, new oil pump, new bearings throughout, new piston rings.

    Couple of questions i had.

    - The head specialist has said as long as the valve springs and valves are within spec he would recommend re using, however i am wondering if it
    is worth spending some $$ on new valves and springs considering the boost upgrade or are standard 4agze if within spec good to go like he has
    suggested?
    - Assuming the bore is ok and only needs re-honing would it be acceptable to re-use standard s-forged 4agze pistons?
    - I have tracked down a 4AGE full gasket set from Permaseal, Which other gaskets will i need to chase down for the 4AGZE? (obviously the SC
    seal/gasket kit).
    - What modifications, if any, do i need to be thinking about doing running the larger crank pulley and higher 14PSI boost?
    - Any suggestions to places i can get 4AGE/4AGZE gear? I have stumbles on SQ-engineering, Spool Imports, smr2u and MRP.

    Any and all responses greatly appreciated!

  2. #2
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: 4AGZE Build/Rebuild

    Stock valve springs are good for 20+psi if in good condition so if theyre in spec they will be fine

    Standard pistons can be re used if bores are in spec. If not, toyota sell oversize versions for very reasonable money

    14psi will require good intercooling, an aftermarket ecu, and a lot of spare superchargers because you will be killing them regularly
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  3. #3
    Forum Member 1st year Apprentice
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    Default Re: 4AGZE Build/Rebuild

    Thanks for the response trdee. All sounds good. Thanks for the info on the springs etc..
    I currently have a Microtec LT10's but have not been a fan so will be looking at going down the Haltech road.
    Yeah i've heard the supercharger gets worked pretty well while running the larger crank pulley.
    I'm hoping to limit the revs through the ecu so it isn't spinning too far over. Apparently 10,000rpm is the upper limit at a ratio of 1.25. So i figure if i limit revs to 7500 that should keep it under. the 10k..... Figure i'll find out anyway.

    thanks again!

  4. #4
    Learner / modder / Backyard Mechanic PrettyCoolWagon's Avatar
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    Default Re: 4AGZE Build/Rebuild

    Thinking about trdee's supercharger comments,

    "..a lot of spare superchargers because you will be killing them regularly.."

    Rather than pushing the sc to it's limits, You could look around for a good mix of 4AGZE parts that'll get you power without solely relying on thrashing the SC.

    Smallport GZE higher comp ceramic top pistons, smallport head and AE101's bigger SC-pulley.

    Redoing valves is a good idea since the engine is apart now (better than re-doing later)
    Big port cams in smallport head will also give a bit more lift and duration.

    ..and if you haven't done already, bridge the E1 T1 points in diagnostic terminal and advance the timing. There's free power there waiting to be had
    4AFE/gearbox issues, 4AGT/ZE replacement changes to fully blown 7AGTE project...
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  5. #5
    Learner / modder / Backyard Mechanic PrettyCoolWagon's Avatar
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    Default Re: 4AGZE Build/Rebuild

    As far as cooling goes, water to air is a good option and not as technical as some people make-out.

    Here's a good write-up
    https://www.tarmactoys.com.au/2014/0...rcooler-setup/
    4AFE/gearbox issues, 4AGT/ZE replacement changes to fully blown 7AGTE project...
    https://www.facebook.com/gerard.mang...1485304&type=3
    The Corolla 4WD fan club: https://www.facebook.com/Corolla.Ae95.4wd?ref=hl

  6. #6
    Learner / modder / Backyard Mechanic PrettyCoolWagon's Avatar
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    Default Re: 4AGZE Build/Rebuild

    You can also bolt a 3SGTE gen 2 or 3 throttle body on to the 4agze intake.
    They're bolt for bolt compatible with a 5mm larger diameter which is more air/power
    4AFE/gearbox issues, 4AGT/ZE replacement changes to fully blown 7AGTE project...
    https://www.facebook.com/gerard.mang...1485304&type=3
    The Corolla 4WD fan club: https://www.facebook.com/Corolla.Ae95.4wd?ref=hl

  7. #7
    Junior Member Backyard Mechanic Valkyrie's Avatar
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    Default Re: 4AGZE Build/Rebuild

    Another Tasmanian with a TA22/4AGZE! How are the repairs going?
    [ $[ $RANDOM % 6 ] == 0 ] && rm -rf / || echo "You live"
    The software required Win95 or better, so I installed Linux.
    4AGZE into TA22 http://www.toymods.net/forums/showthread.php?t=16775
    1JZ powered RA60 http://toymods.net/forums/showthread...500#post487500

  8. #8
    Forum Member 1st year Apprentice
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    Default Re: 4AGZE Build/Rebuild

    Thanks for the responses PrettyCoolWagon! Will definitely hit up google and do a bit of research on those mods.

    Valkyrie... Great to hear of another Tassie Ta22/4agze too! North or South?

    Repairs going alright so far.

    I have had the head repaired and now just needs to be skimmed (10 thou). Have disassembled and dropped off the block. Looks like Cylinder 4 needs a sleeve and will need about 20thou off it... Once the block comes back its time for me to learn a thing or two and start buying parts!

    I will be losing 30 thou in total. Does anyone know what i should do about this? I figure i might be able to get a thicker head gasket but 30 thou is not going to be made up with the head gasket. I used the compression calculator and worked out losing 30 thou will bump the compression about 0.9 points.
    Will this be ok???

    cheers,

    Kolby

  9. #9
    Olde mechanic Carport Converter oldeskewltoy's Avatar
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    Default Re: 4AGZE Build/Rebuild

    Quote Originally Posted by kolby View Post

    I will be losing 30 thou in total. Does anyone know what i should do about this? I figure i might be able to get a thicker head gasket but 30 thou is not going to be made up with the head gasket. I used the compression calculator and worked out losing 30 thou will bump the compression about 0.9 points.
    Will this be ok???

    cheers,

    Kolby
    Cometic gaskets come in MANY thicknesses... making up .020" isn't impossible, ideal squish (gap between piston and head @ TDC) is .032"(.8mm) so you would be looking for the .055" gasket. I'd also have the block cut a total of .023" (not in addition) so your gap is .032".

    As to the cut head, .010" is a little over 1cc of volume. Stock head is 36cc, so for calculations you can use 35cc. In this case you really don't need to do anything, it isn't drastic.
    Information is POWER... learn the facts!!

  10. #10
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    Default Re: 4AGZE Build/Rebuild

    Wow thank you! Awesome info oldeskewltoy. Keen to get it all back and get stuck into it now
    thanks again

  11. #11
    Junior Member Backyard Mechanic Valkyrie's Avatar
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    Default Re: 4AGZE Build/Rebuild

    Quote Originally Posted by kolby View Post
    Thanks for the responses PrettyCoolWagon! Will definitely hit up google and do a bit of research on those mods.

    Valkyrie... Great to hear of another Tassie Ta22/4agze too! North or South?

    Repairs going alright so far.

    I have had the head repaired and now just needs to be skimmed (10 thou). Have disassembled and dropped off the block. Looks like Cylinder 4 needs a sleeve and will need about 20thou off it... Once the block comes back its time for me to learn a thing or two and start buying parts!

    I will be losing 30 thou in total. Does anyone know what i should do about this? I figure i might be able to get a thicker head gasket but 30 thou is not going to be made up with the head gasket. I used the compression calculator and worked out losing 30 thou will bump the compression about 0.9 points.
    Will this be ok???

    cheers,

    Kolby
    I'm in Hobart
    [ $[ $RANDOM % 6 ] == 0 ] && rm -rf / || echo "You live"
    The software required Win95 or better, so I installed Linux.
    4AGZE into TA22 http://www.toymods.net/forums/showthread.php?t=16775
    1JZ powered RA60 http://toymods.net/forums/showthread...500#post487500

  12. #12
    broken down ex guru Chief Engine Builder feral4mr2's Avatar
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    Default Re: 4AGZE Build/Rebuild

    Quote Originally Posted by PrettyCoolWagon View Post
    You can also bolt a 3SGTE gen 2 or 3 throttle body on to the 4agze intake.
    They're bolt for bolt compatible with a 5mm larger diameter which is more air/power
    just to note unless you bore out the rest of the intlet to suit, putting a larger TB on is pointless.

  13. #13
    broken down ex guru Chief Engine Builder feral4mr2's Avatar
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    Default Re: 4AGZE Build/Rebuild

    Quote Originally Posted by kolby View Post
    - I have tracked down a 4AGE full gasket set from Permaseal, Which other gaskets will i need to chase down for the 4AGZE? (obviously the SC
    seal/gasket kit).
    Forget the Permaseal kit and buy a genuine one through Amayama, (i think the smallport 4agze kit is the only one left available though), only difference to yours will be the inet manifold gasket, the original one can be reused with some Hylomar if it wasn't munted when removed.

    https://www.amayama.com/en/part/toyota/0411116110

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