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2.7 v. 5.2 engine cradle differences

Discussion in '348/355' started by Carmellini, Nov 11, 2019.

  1. Carmellini

    Carmellini Formula Junior

    Jul 16, 2019
    450
    wondering what the differences are between the 2.7 cradle and the 5.2 cradle? thinking it might be as innocuous as an E brake mounting tab....??? or, is there some major difference that would render it inadvisable to swap one with the other?
     
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  3. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    10,527
    San Carlos, CA
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    Mitchell Le
    No major differences. The 2.7 version is more prone to cracking at the upright of the shock mounting points and that is where the 5.2 version is beefed up.
     
  4. Carmellini

    Carmellini Formula Junior

    Jul 16, 2019
    450
    ^^^^^^^ is that "beef up" visually obvious?
     
  5. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
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    Mitchell Le
    No. They use thicker stock material.
     
  6. krazykarguy

    krazykarguy Formula Junior

    Apr 17, 2014
    624
    Fort Mill, SC
    Full Name:
    Matt
    The mounting tab for the upper wishbones is slightly different on the 5.2s. It’s buttressed.

    There is a thread about it from recently with pics.
     
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  8. Carmellini

    Carmellini Formula Junior

    Jul 16, 2019
    450
    ^^^ do you happen to remember when that was posted or the title?
     
  9. vvassallo

    vvassallo F1 Veteran
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    Aug 4, 2006
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    Vince V
    We found that there are additional gussets on later 5.2's as well.
     
  10. 308 GTB

    308 GTB F1 World Champ
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    Feb 7, 2002
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    Barry Wolinsky
  11. Carmellini

    Carmellini Formula Junior

    Jul 16, 2019
    450
    ^^^^^^ thanks for that link, and the info

    I have "heard" that the cradle is inherently a weak component and susceptible to a variety of issues.
    anyone want to comment on that "rumor?"
     
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  13. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
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    Mitchell Le
    The only weakness is the tendency to crack at the driver side upper support. I have not seen any other weakness. It is held to the main frame with 20 bolts. I don't know if I would call that weak. What are the rumors saying?
     
  14. Carmellini

    Carmellini Formula Junior

    Jul 16, 2019
    450
    what I have heard, I don't understand: that the metal used is dirty (?)……. is of poor quality and does not take well to welding
     
  15. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
    10,527
    San Carlos, CA
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    Mitchell Le
    Ah, you need to be a good welder. The thin metal is prone to blowing through but a good welder with gas will solve that.
     
  16. SoCal1

    SoCal1 F1 Veteran
    Owner

    Jun 14, 2011
    8,199
    SoCal LA/OC
    Full Name:
    Tim Dee

    Correct absolute **** carbon steel

    My winter project doing a 3D drawing off my measuring jig and building a correct rear section thats adjustable in all the right places
     

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