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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
    #1 Carmellini, Nov 11, 2019
    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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    #2 yelcab, Nov 11, 2019
    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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    #3 Carmellini, Nov 11, 2019
    ^^^^^^^ is that "beef up" visually obvious?
     
  4. yelcab

    yelcab F1 Veteran
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    #4 yelcab, Nov 11, 2019
    No. They use thicker stock material.
     
  5. krazykarguy

    krazykarguy Formula Junior
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    #5 krazykarguy, Nov 11, 2019
    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.
     
    Qavion likes this.
  6. Carmellini

    Carmellini Karting
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    #6 Carmellini, Nov 11, 2019
    ^^^ do you happen to remember when that was posted or the title?
     
  7. vvassallo

    vvassallo F1 Veteran

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    #7 vvassallo, Nov 11, 2019
    We found that there are additional gussets on later 5.2's as well.
     
  8. 308 GTB

    308 GTB F1 Veteran
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    #8 308 GTB, Nov 11, 2019
  9. Carmellini

    Carmellini Karting
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    #9 Carmellini, Nov 12, 2019
    ^^^^^^ 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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    #10 yelcab, Nov 12, 2019
    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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    #11 Carmellini, Nov 12, 2019
    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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    #12 yelcab, Nov 12, 2019
    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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    #13 SoCal1, Nov 12, 2019

    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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