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Thread: the 7AGE thread

  1. #1
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    Default the 7AGE thread


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    we need one, so i started one....discuss

    if anyone wants to copy and paste the posts from the original ae86dc thread, please feel free...i cbf

    *sticky*???

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    Last edited by slydar; 19th January 2009 at 09:51 AM.

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    this is a reply on my thread on toymods from some one asking what part of the rod usually fails, and under what conditions.

    http://www.toymods.net/forums/showthread.php?t=6751

    Quote Originally Posted by johnny
    Thread pulled out on all the one's I've had, and I have run a season and a half with standard rods, bored out with the floating pins, and yes precision is a must... but I have also run the inference setup too. We went to A/M cause I didn't feel there was a need to spend $$$ every year or spend every second season on the sideline half way through+ even more $$$$... it was Better spent doing it right first time (should say second ) but then again the engine was spending all day, every day on the higher side of 7,300-7,500 and the fatal nail was a missed gear seeing it soar to around 9K :eek:, not once but on a third oops on the same corner.... I will admit I would of liked some oil squirters there and they can always be install afterwards with a bit of thought and most likely trail and error.

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    http://www.ae86drivingclub.com.au/fo...ead.php?t=1308

    heres a thread i started last week. for all the guys who would like a basic DIY 7age .

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    comparisons.

    rod length 4a 122 7a 132.5
    little end 4a 18(late ge 20) 7a 20

    7a deck height is an extra 15.4mm

    "crank radius" 4a 38.5, 7a 42.75.

    4A
    -bore: 81.0 stroke: 77.0

    7A-FE :
    -bore: 81.0 stroke: 85.5

    rod ratio

    4a 1.58

    7a 1.55

    difference in rod length 10.5mm
    difference in "crank radius" 4.25mm

    total of 14.75mm. deck height difference as listed is 15.4mm.

    so it should be noted, there is a difference is compression height of 0.65mm.

    this is important to consider when calculating/selecting compression ratios. it can be accounted for by using thinner HG's. the reason for the discrepancy is most likely because the 7afe uses a metal hg standard, apparently .8mm, but certainly thinner than a 4a one.

    also important to note, is the extra capacity of the 7a will give you a higher cr anyway, when using 4age pistons.

    if i were building an NA motor, id still have the block deck machined 0.65mm anyway. as this is clearly possible/safe. no chance of piston/head interference, or rings popping out of the block.

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    soooo much love....
    RIP Carly - a smile to light the world.
    06/07/2011

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    Veteran slydar's Avatar
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    for the 7a, yes. it is win. i will probably build one this year. theyre turning up more and more at the wreckers. missed on just the other week. would have cost me $120 or so.

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    bump. why not.

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    any idea on how much to pay at a wreckers for a 7afe bottom end ??
    yo. i got fans across the country. Dongsoo Kim is who they feelin' , last time you had a fan, it was spinnin' from tha ceiling ! haha.

    Quote Originally Posted by rollin33 View Post
    Sun_moon that?s badass name. you?re a loser go watch the sunset with your boyfriend.


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    TO REMOVE ADS, PLEASE
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    they wont ever sell you a bottom end. it will be a full motor.

    the going rate used to be $600-$700, but they have started to come down at some places if you look around.

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