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Thread: 4AGZE Pistons?

  1. #31
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: 4AGZE Pistons?

    Quote Originally Posted by oldeskewltoy View Post
    ???????




    I saw the rods... and just a bit of the skirts... it appears from your rod photo that the AE92 4AGZE has full skirts, and the AE101 has cut down skirts.... is that what you are trying to say????


    Btw... if I might ask about your thread... how can a smallport make its power @ 7200 when the late TVIS engine uses the exact same cams but can only twist to 6600???????
    the thread was to enlighten you as to the two different types of 4AGZE pistons. All pre-AE101 4AGZE pistons are the same 8:1 style pistons with no oil squirter notching, whereas the AE101 ones are the 8.9:1 style with oil squirter notches.

    As for the power output, dont ask me, ask toyota, that's their factory specs Could be many different reasons. The bigport and smallport engines have vastly different engine characteristics.

    Also, I must agree with everyone else here in terms of the oil squirters. The 8.9:1 pistons were also ceramic coated unlike the earlier ones. The ceramic coating along with the oil squirter notches is a pretty good indicator that they were trying to dissipate hotspots in the pistons *imo*
    1988 AW11 9A-GTE - Turbo Missile | 2004 Elise K20A - N/A Screamer | 1984 MA61 1JZ-GTE - 80s cruiser
    Quote Originally Posted by Rex_Kelway View Post
    .....and the within first laps everything that made the AW11 great hit Rex as if the 'Gods of driving fun' had all Jizzed on his face.....
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  2. #32
    Junior Member Backyard Mechanic
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    Default Re: 4AGZE Pistons?

    fitting 8.0:1 gze pistons greatly affect the responsiveness of the engine. I've assembled 2 of them in a small port in 2 separate rebuild and i don't really like the laziness of the 8.0 during off boost response. Only choose 8.0 when you aiming for big boost (more than 20psi).
    Just my 2cents.

    CHB
    Last edited by CHB; 11-04-2011 at 11:15 AM.

  3. #33
    Twisted ****** Backyard Mechanic .T.'s Avatar
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    Default Re: 4AGZE Pistons?

    i've puled down a number of 4agze motors in my time, & have found several early motors (ie aw11) that had ceramic crowns on them.

    in fact, bar the cutouts for the oil squirters i don't think there is any difference in the pistons between early & late motors.

    would be interesting to cc a small port & a bigport head - as if my suspicions are right, that is where the difference in c/r is....

    T

  4. #34
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: 4AGZE Pistons?

    how do you know they werent rebuilt motors?

    The part numbers for the smallport and bigport gze pistons are different, and correspond exactly to the dished and non dished pistons.

    It could be that toyota now supply the 8:1 pistons with ceramic coating when they originally didnt. Even so, every aw11 gze ive seen pulled down which was supposed to be an original engine (about 5 of em now) has had the dished 8:1 pistons with no ceramic coating.
    1988 AW11 9A-GTE - Turbo Missile | 2004 Elise K20A - N/A Screamer | 1984 MA61 1JZ-GTE - 80s cruiser
    Quote Originally Posted by Rex_Kelway View Post
    .....and the within first laps everything that made the AW11 great hit Rex as if the 'Gods of driving fun' had all Jizzed on his face.....
    Quote Originally Posted by JustenGT8 View Post
    Mono blocs mate....as close to yours as a Ferrari is to a Fiesta

  5. #35
    Junior Member Chief Engine Builder wiso's Avatar
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    Default Re: 4AGZE Pistons?

    Quote Originally Posted by gazza View Post
    I have come across these pistons,but i'm not 100% sure what they are.they are meant to be 3rd series 4agze pistons.

    any ideas?

    these are AW11 4agze ones, they certainly look alot deeper on top than tha original ones pictures

    89' MR2 AW11... His
    00' MR2 ZZW30... Hers

  6. #36
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: 4AGZE Pistons?

    thats the difference.
    the flycuts go to (afaict) the same depth on both.. at lest with my measurign tools.. but the dish volume is different, hence the 8 and 8.9 CR..
    so you could easily work back and calculate the difference in dish anyway....

    btw, i don't think it is exactly a ceramic coating either....

    maybe i should finish that piston thread one day....
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  7. #37
    Your mum is a Conversion King TERRA Operative's Avatar
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    Default Re: 4AGZE Pistons?

    Do it! (Maybe start a dedicated 4A piston analysis thread) And reupload the photos of the microscopic stuff, I'm interested in that.

  8. #38
    Olde mechanic Carport Converter oldeskewltoy's Avatar
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    Default Re: 4AGZE Pistons?




    concerning AE92 pistons... SOME of them do have the notches

    Here is the AE92 piston listings...
    13101-16100-01 4AGZE..AE92; STD, MARK1
    13101-16100-02 4AGZE..AE92; STD, MARK2
    13101-16100-03 4AGZE..AE92; STD, MARK3
    13101-16130-01 4AGZE..AE92; STD, MARK 1
    13101-16130-02 4AGZE..AE92; STD, MARK 2
    13101-16130-03 4AGZE..AE92; STD, MARK 3
    13103-16100 4AGZE..AE92; O/S 0.50 (08/1987 - 04/1989)
    13103-16130 4AGZE..AE92; O/S 0.50 (05/1989 - 03/1991)


    I've highlighted the dates because the squirters appear in the beginning of 1990
    Last edited by oldeskewltoy; 12-04-2011 at 12:56 AM. Reason: added info
    Information is POWER... learn the facts!!

  9. #39
    Spirited Backyard Mechanic Casey-G's Avatar
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    Default Re: 4AGZE Pistons?

    Yes some ae92 pistons will have notches as all the smallports eg: any sx or GTi model will have a 7rib block with oil squirters. Its not just the 4agze that has them.

    and the 1990 this isn't accurate, my 1989 seca had a 7rib 4age in it and it had squirters.


    Quote Originally Posted by oldeskewltoy View Post



    concerning AE92 pistons... SOME of them do have the notches

    Here is the AE92 piston listings...
    13101-16100-01 4AGZE..AE92; STD, MARK1
    13101-16100-02 4AGZE..AE92; STD, MARK2
    13101-16100-03 4AGZE..AE92; STD, MARK3
    13101-16130-01 4AGZE..AE92; STD, MARK 1
    13101-16130-02 4AGZE..AE92; STD, MARK 2
    13101-16130-03 4AGZE..AE92; STD, MARK 3
    13103-16100 4AGZE..AE92; O/S 0.50 (08/1987 - 04/1989)
    13103-16130 4AGZE..AE92; O/S 0.50 (05/1989 - 03/1991)


    I've highlighted the dates because the squirters appear in the beginning of 1990

  10. #40
    Junior Member Backyard Mechanic
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    Default Re: 4AGZE Pistons?

    Quote Originally Posted by trdee View Post
    They are AE101 4A-GZE pistons. Compression ratio 8.9:1, and like all GZE pistons, are forged
    Quote Originally Posted by trdee View Post
    the thread was to enlighten you as to the two different types of 4AGZE pistons. All pre-AE101 4AGZE pistons are the same 8:1 style pistons with no oil squirter notching, whereas the AE101 ones are the 8.9:1 style with oil squirter notches.
    ...
    Thats not completley true. The late AE92(90-91) 4AGZE was smallport, dli, map and had 8.9:1 pistons.

  11. #41
    Spirited Backyard Mechanic Casey-G's Avatar
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    Default Re: 4AGZE Pistons?

    smallport 8.9:1 slugs, map, dli gze was never released in a ae92 shell.


    it just wasn't.

  12. #42
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: 4AGZE Pistons?

    Quote Originally Posted by mr2gze View Post
    Thats not completley true. The late AE92(90-91) 4AGZE was smallport, dli, map and had 8.9:1 pistons.
    I have only seen an AFM bigport (8:1) with DLI released in the AE92 GTZ. I know this cos I swapped one of these motors into harreh's aw11 only recently

    The smallport 8.9:1 engines ive only ever seen in the AE101 GTZ. Can someone provide some sort of proof that the smallport 4agze was released in the AE92? Club4AG/wikipedia both say it is so, but they are both prone to errors. What does toyoDIY say? That would probably be the best indicator.
    Last edited by trdee; 13-04-2011 at 11:08 PM.
    1988 AW11 9A-GTE - Turbo Missile | 2004 Elise K20A - N/A Screamer | 1984 MA61 1JZ-GTE - 80s cruiser
    Quote Originally Posted by Rex_Kelway View Post
    .....and the within first laps everything that made the AW11 great hit Rex as if the 'Gods of driving fun' had all Jizzed on his face.....
    Quote Originally Posted by JustenGT8 View Post
    Mono blocs mate....as close to yours as a Ferrari is to a Fiesta

  13. #43
    Junior Member Backyard Mechanic
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    Default Re: 4AGZE Pistons?

    I am, wait 5 minutes...

  14. #44
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    Default Re: 4AGZE Pistons?

    Quote Originally Posted by Casey-G View Post
    smallport 8.9:1 slugs, map, dli gze was never released in a ae92 shell.


    it just wasn't.
    Quote Originally Posted by trdee View Post
    No it was an AFM bigport (8:1) with DLI. I know this cos I swapped one of these motors into harreh's aw11 only recently

    The engine you describe was available in the AE101 GTZ .
    Okay so the hardway...

    A:


    B:


    C:


    D:


    E:



    trdee Please re-read what I said (late AE92) you obviously fitted an early motor

    Casey-G Dont mean to be rude, anything to back up what you said other than hearsay?

    To correct myself it was 8905-91 not 90-91.

  15. #45
    Spirited Backyard Mechanic Casey-G's Avatar
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    Default Re: 4AGZE Pistons?

    My info isn't hearsay, its very common to find ae101 slugs in early model gze's as the wrist pin is the same size and the 8:1 pistons are discontinued since 91.

    I don't think it is wise to use ToyoDIY as your source of information, part numbers match as some parts are discontinued since formation of that specific website.


    as per your last pic, all listings are for ae101 released gze's as the previous versions were all bigports.

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