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Thread: Toyota Piston Codes

  1. #1
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    Toyota Piston Codes

    I have a 20v and I am going to be buying a set of 4agze 8.9-1 pistons for it. What is the difference between the mark 1/2/3 pistons listed from toyota? I assume this is a letter designating tolerances but what are the differences if anyone knows?
    Any idea where I can find the stamped letter on the block to match them up to, if I need to?
    Ive done a dozen swaps and have re-ringed motors, but never swapped pistons before.
    Any help is appreciated.
    20v, 6spd w/lsd.
    Corners Quickly

  2. #2
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    From the MR2 Owners Club Message Board:

    USDM 8.0:1 4AGZE Pistons & Rings
    Pistons:
    STD:
    13101-16100-01 4AGZE, AW11 STD MARK1
    13101-16100-02 4AGZE, AW11 STD MARK1
    13101-16100-03 4AGZE, AW11 STD MARK1

    OVERSIZE:
    13103-16100 4AGZE, AW11 O/S .50mm

    Rings:
    OVERSIZE:
    13013-16090 4AGZE, AW11 O/S .50mm

    JDM 8.9:1 4AGZE Pistons & Rings
    Pistons:
    STD:
    13101-16131-01 4AGZE, AE101 STD MARK1
    13101-16131-02 4AGZE, AE101 STD MARK2
    13101-16131-03 4AGZE, AE101 STD MARK3
    OVERSIZE:
    13103-16131 4AGZE, AE101 O/S .50mm

    Rings:
    STD:
    13011-16210 4AGZE, AE101
    OVERSIZE:
    13013-16210 4AGZE, AE101 O/S .50mm
    Current:
    91 LJ78 Landcruiser EX5
    95 A32 Maxima SE
    Former:
    87 AW11 MR2 Smallport 4AGZE
    93 Taurus SHO ATX
    86 AL25 SR5 6spd 4wd
    90 AE92 GTS
    82 KP61 SR5
    85 MX73
    87 AE86 GTS 4AGZE
    85 AE86 GTS
    83 AL21

  3. #3
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    GTSSportCoupe, that information doesn't tell you anything.

    MXR, the numbers stamped on the pistons are the diameter of the piston. What you need to order will depend on the bore size of your block and how much oil clearance you want to run.

    After you hone the block, accurately measure the bore, find out what the oil clearance should be, then go from there.

    I'll check what the numbers correspond to when I have a chance. The factory bore sizes will be stamped on the block as well.

    Jeff

    2011 Lexus IS250 Obsidian "F-Sport 6MT" with LSD
    1986 AE86 Corolla GT-S Supercharged

  4. #4
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    I don't know about toyota for sure but I do know that sometimes when they manufacture domestics, they will have a 1, 2, or 3 thousands of an inch piston tighter or looser to mate a hole that is not perfectly in spec. They do the same with bearings too.


    Or you could have said "sorry, my kidnap victims keep kicking my elbow, it made me drop my crack pipe and swerve"

    -bangnscrape

  5. #5
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    Yes, that is what the numbering is for, but what the numbers actually mean can vary from engine to engine. For example a #1 4A-FE piston is not the same diameter as a 4A-GE piston, because they have different oil clearance specs.

    Jeff

    2011 Lexus IS250 Obsidian "F-Sport 6MT" with LSD
    1986 AE86 Corolla GT-S Supercharged

  6. #6
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    Thats exactly what I was wondering about. Im wanting to use the Jdm 8.9:1 pistons but I assume the oil tolerances will be the same if not very similar for the 8.0:1 motor.

    Thanks Jeff, much appreciated.
    20v, 6spd w/lsd.
    Corners Quickly

  7. #7
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    Quote Originally Posted by mxr View Post
    Thats exactly what I was wondering about. Im wanting to use the Jdm 8.9:1 pistons but I assume the oil tolerances will be the same if not very similar for the 8.0:1 motor.

    Thanks Jeff, much appreciated.
    I would always just buy a set of oversize pistons, bore the engine out based on a target piston-to-wall clearance. You get the taper out and therefore the best result for ring and compression longevity.


    Or you could have said "sorry, my kidnap victims keep kicking my elbow, it made me drop my crack pipe and swerve"

    -bangnscrape

  8. #8
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    Yeah... It is supposed to be a budget build but I don't know if I can pull it off. Ill find out tomorrow what a few shops want to bore out the motor, I just am afraid of the cost.
    20v, 6spd w/lsd.
    Corners Quickly

  9. #9
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    I know for me I apways save a lot of money by doing my own measurements and assembly. I tell the machine shop what I want, I never let them tell me what I need. Good measuring tools like micrometers and a good dial bore gauge have reaped many rewards in engine building for me.


    Or you could have said "sorry, my kidnap victims keep kicking my elbow, it made me drop my crack pipe and swerve"

    -bangnscrape

  10. #10
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    Quote Originally Posted by sunray View Post
    I don't know about toyota for sure but I do know that sometimes when they manufacture domestics, they will have a 1, 2, or 3 thousands of an inch piston tighter or looser to mate a hole that is not perfectly in spec. They do the same with bearings too.
    5/10thou is usually the size difference between 1/2/3 sizes on Toyota stuff.

    0.0005" or half-thou.

    Look for a stamping on the oil pan gasket surface that says 2212 or 2222 or whatever, and that is your original bore size. After a VERY light hone, you can re-install new pistons of the same size and not have problems.

    Cheers.
    - Brian


  11. #11
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    Well then would you consider going 3323 if the stock was 2212 and you don't do a very light hone? Or do you risk it being too tight? 0.0005" isn't all that much....
    I appreciate the input and help guys.
    20v, 6spd w/lsd.
    Corners Quickly

  12. #12
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    Quote Originally Posted by mxr View Post
    Well then would you consider going 3323 if the stock was 2212 and you don't do a very light hone? Or do you risk it being too tight? 0.0005" isn't all that much....
    I appreciate the input and help guys.
    If you are hell bent on not boring it out then I would suggest doing a doing a quick hone, re-ring and stick the original pistons back in. Its not worth the cost of new pistons in an un-refinished bore. You'd be wasting your money.


    Or you could have said "sorry, my kidnap victims keep kicking my elbow, it made me drop my crack pipe and swerve"

    -bangnscrape

  13. #13
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    if ur putting gze pistons in a 20v block are u using the 20v rods? silver top or black top?
    simply pointing out stupid

  14. #14
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    Quote Originally Posted by Jeff Lange View Post
    After you hone the block, accurately measure the bore, find out what the oil clearance should be, then go from there. Jeff
    Actually, you should get your pistons first and take them to the machine shop so they can bore and/or hone your block to fit the pistons.

  15. #15
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    general question but how does one pick what oil clearance to run?

  16. #16
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    Quote Originally Posted by sunray View Post
    I know for me I apways save a lot of money by doing my own measurements and assembly. I tell the machine shop what I want, I never let them tell me what I need. Good measuring tools like micrometers and a good dial bore gauge have reaped many rewards in engine building for me.
    I have looked at bore gauges and they seem to be from 70-250 dollars. What is the accuracy of yours?

    Quote Originally Posted by rob rayne View Post
    if ur putting gze pistons in a 20v block are u using the 20v rods? silver top or black top?
    Its a silvertop. I wouldn't put any boost on blacktop rods.

    Quote Originally Posted by Rastaracer View Post
    Actually, you should get your pistons first and take them to the machine shop so they can bore and/or hone your block to fit the pistons.
    This is what may very well happen. Depending on the quotes I get, I may just get the motor bored for the o/s pistons.
    20v, 6spd w/lsd.
    Corners Quickly

  17. #17
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    Would anyone know who may have access to the 8.9:1 4agze pistons? Otherwise I don't really have a choice but to run the mark 1-3 8.9-1 pistons.
    20v, 6spd w/lsd.
    Corners Quickly

  18. #18
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    Quote Originally Posted by Jeff Lange View Post
    GTSSportCoupe, that information doesn't tell you anything.

    Jeff
    I was providing part #s for reference only, not trying to answer his question. He might be safest to bore out 0.5mm and go with the 0.5mm oversize pistons and rings. In that case, the numbers I provided would be helpful.
    Current:
    91 LJ78 Landcruiser EX5
    95 A32 Maxima SE
    Former:
    87 AW11 MR2 Smallport 4AGZE
    93 Taurus SHO ATX
    86 AL25 SR5 6spd 4wd
    90 AE92 GTS
    82 KP61 SR5
    85 MX73
    87 AE86 GTS 4AGZE
    85 AE86 GTS
    83 AL21

  19. #19
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    To answer your question about bore gauges, a god dial bore gauge can have different sensitivity deleding on what dial indicator you mount. Mine came with one acurrate to 5 ten thousandths but when working with Ford 4.6l and 5.4l engines I have to put one that goes to 1 ten thousandth to clearance those. The half a thou one is fine for toyotas though.


    Or you could have said "sorry, my kidnap victims keep kicking my elbow, it made me drop my crack pipe and swerve"

    -bangnscrape

  20. #20
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    Quote Originally Posted by GTSSportCoupe View Post
    I was providing part #s for reference only, not trying to answer his question. He might be safest to bore out 0.5mm and go with the 0.5mm oversize pistons and rings. In that case, the numbers I provided would be helpful.
    Except Toyota says that the 0.5mm o/s don't exist and the pn is bad....
    20v, 6spd w/lsd.
    Corners Quickly

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