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OK to Keep Exhaust Manifold Cover Off?

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    #1

    OK to Keep Exhaust Manifold Cover Off?

    I just took my exhaust manifold cover off in attempt to find my O2 sensor and I'm wondering if its ok to keep it off (pain in ass to put back on). Are there any disadvantages to keeping the front cover off? I've heard that it's purpose is to keep the manifold from getting water on it which might cause the manifold to crack due to the temp difference - hot to cold.

    Thoughts...

    91 EX, body/chassis ~235,000; rebuilt f22a6 crate engine ~65,000 (3/2011)
    Neuspeed Super Cup Kit (7/2010)
    TAS rear drum-to-disc conversion (6/2010)
    Above photo taken - 4/2010
    Tags: None
    #2
    apparently it decreases the life of your alternator according to TypeG, but I've never heard of anything wrong with no manifold.

    Comment

      #3
      It's not a big deal. It does increase underhood temps a bit, which will cause rubber and plastic to become brittle. However, by this time, all of those things are brittle anyway!

      Just about everyone that installs an aftermarket header runs without any sort of cover.



      And yeah, it can decrease the life of the alternator, and any other electrical components. Electrical stuff and heat don't mix.






      Comment

        #4
        While on the subject, is the O2 sensor underneath the cover? I still can't find it. I have the engine type which DOES NOT have the O2 sensor going right through the cover.

        91 EX, body/chassis ~235,000; rebuilt f22a6 crate engine ~65,000 (3/2011)
        Neuspeed Super Cup Kit (7/2010)
        TAS rear drum-to-disc conversion (6/2010)
        Above photo taken - 4/2010

        Comment

          #5
          Originally posted by jkrolikowski View Post
          While on the subject, is the O2 sensor underneath the cover? I still can't find it. I have the engine type which DOES NOT have the O2 sensor going right through the cover.
          F22A1 has it on the front of the header.
          On the F22A1 and F22A6 it's on the downpipe in front of the cat.


          Edit: Corrected, wasn't thinking straight last night
          Last edited by JoshM; 08-03-2009, 08:35 AM.

          1999 BMW M3
          2001 Honda CR-V SE RT4WD
          2005 Chevrolet Tahoe Z71
          2015 Suzuki V-Strom 650

          Comment

            #6
            actually it's the f22a1 that has it in the header. the f22a4/a6 have it in the downpipe. later.
            Avoiding dirt at all costs

            Comment

              #7
              My buddy got a header from the JY and it had a small plate attached to keep heat from the alt. I've ran my CB for a couple years without the cover and never had an issue.

              If your runnin AC it might heat the line up to much>?????

              GOT F?

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