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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 Karting
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    Leo Johns
    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?
     
  2. yelcab

    yelcab F1 Veteran
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    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.
     
  3. Carmellini

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    ^^^^^^^ is that "beef up" visually obvious?
     
  4. yelcab

    yelcab F1 Veteran
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    No. They use thicker stock material.
     
  5. krazykarguy

    krazykarguy Formula Junior
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    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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  6. Carmellini

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    ^^^ do you happen to remember when that was posted or the title?
     
  7. vvassallo

    vvassallo F1 Veteran

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    We found that there are additional gussets on later 5.2's as well.
     
  8. 308 GTB

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  9. Carmellini

    Carmellini Karting
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    ^^^^^^ 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?"
     
  10. yelcab

    yelcab F1 Veteran
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    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?
     
  11. Carmellini

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    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
     
  12. yelcab

    yelcab F1 Veteran
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    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.
     
  13. SoCal1

    SoCal1 F1 Veteran
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    Jun 14, 2011
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    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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