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Thread: 4AGE Build - 4age Experts Please Comment!

  1. #11
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    I really hope it's a 4ac crank. If it is it will be a testament to its strength, this motor has been flogged to the limitier every drive of its life since I've had it, including many Winton track days! Can't wait to open her up for inspection and reveal what it has :-D

  • #12
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    Quote Originally Posted by Jimmee1990 View Post
    I've had a look at a pre-production 3 rib bigport 4A-GE development engine, and it had an 8 bolt flywheel. As well the genuine parts catalogue listing nothing but an 8 bolt part number. That myth I suspect was created so some dodgy people could build a slapper motor out of left-overs, and Billzilla's site is full of wrong and mis-information and shouldn't be treated as a bible by any means.
    Agree with this.

  • #13
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    Quote Originally Posted by pro86 View Post
    I really hope it's a 4ac crank. If it is it will be a testament to its strength, this motor has been flogged to the limitier every drive of its life since I've had it, including many Winton track days! Can't wait to open her up for inspection and reveal what it has :-D
    Always look on the bright side ! lol

  • #14
    Moderator Sam-Q's Avatar
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    I suggest fitting a later model oil pump:

    http://www.sq-engineering.com/upgrad...m-options.html

    Not because I sell them but because the early pumps are prone to fail from fatigue and flow less due to the narrower gears.


    Another option to help with the piston choice is using 4afe rods, I have been told they have the same smaller diameter big end size as the bigport cranks but have a 20mm Gudgen pin instead of 18mm. This gives you much more piston options to choose from.
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

    - SQ Engineering on facebook -

    Please e-mail to contact me instead of sending a private message on here.

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