Exhaust flange spring bolt tension | FerrariChat
Buy

Exhaust flange spring bolt tension

Discussion in 'Technical Q&A' started by alex360S, May 10, 2020.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. alex360S

    alex360S Formula Junior

    Oct 30, 2006
    324
    Montreal, Quebec
    Full Name:
    Alex
    #1 alex360S, May 10, 2020
    I have looked over the forum and on the net with no clear answer. The 360 manual calls for 75 nm tension on the exhaust flange spring bolts which must be a mistake, the flanges bend under that stress. Can someone please advise how to properly install and tension those spring bolts at the flange joining header and cat.
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,556
    San Carlos, CA
    Full Name:
    Mitchell Le
    #2 yelcab, May 10, 2020
    Those long M8 bolts with a spring at one end? 25Nm is all you will be able to get on there. I have always been of the camp "tight enough is enough" on exhaust bolts because it is hard to get a torque wrench in there. I think I always ended up somewhere 15-20 Nm.
     
  3. alex360S

    alex360S Formula Junior

    Oct 30, 2006
    324
    Montreal, Quebec
    Full Name:
    Alex
    #3 alex360S, May 10, 2020
    Thank you for the reply. I’m currently at 22 nm. Should I slack off a bit to 18 nm?
     
  4. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,556
    San Carlos, CA
    Full Name:
    Mitchell Le
    #4 yelcab, May 10, 2020
    Leave it be at 22. Good enough.
     
    thorn likes this.

Share This Page