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Leak or Cracked manifold?

Discussion in 'Technical Q&A' started by jssans, Mar 8, 2006.

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  1. jssans

    jssans Formula Junior

    Jun 1, 2005
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    Josh
    #1 jssans, Mar 8, 2006
    Could a manifold leak stop ticking after the engine & manifolds warm up, or only a thin crack would stop ticking? Or both?! More specifically on a 1995 F355 manifold.
     
  2. Ken

    Ken F1 World Champ

    Oct 19, 2001
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    #2 Ken, Mar 8, 2006
    One would think it could, but if it's cracked (as seems common on 355's) it will just get worse. You need to address the issue before it causes lots of other problems. I had some loose bolts on my header at the block and it ticked, but didn't stop with heat. Took me a month to find the source of the noise; whoda thunk that would ever be loose; most are so tight you can't get them off!


    ken
     
  3. jssans

    jssans Formula Junior

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    Josh
    #3 jssans, Mar 8, 2006
    did ur engine tick when cold then go away after 5 or so minutes?
     
  4. Ken

    Ken F1 World Champ

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    #4 Ken, Mar 8, 2006
    No; it kept ticking; but the nuts in question were finger loose.

    Ken
     
  5. Aircon

    Aircon Ten Time F1 World Champ
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    Jun 23, 2003
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    #5 Aircon, Mar 8, 2006
    mine did. i think the metal expands when it gets hot and blocks up the opening. it does continue to get worse over time, though.
     
  6. Dr_ferrari

    Dr_ferrari Formula 3
    Consultant Professional Ferrari Technician

    Nov 2, 2003
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    Jim McGee
    #6 Dr_ferrari, Mar 8, 2006
    Yes, Without a doubt. The earlier ones crack right on the front or back side of the secondary air tubes.

    regards, Jim
     
  7. RossoCorsaItaly

    RossoCorsaItaly F1 Rookie
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    #7 RossoCorsaItaly, Mar 8, 2006
    Yes, and if you need a pair of manifolds, send us an email. We are starting to take orders again now that we've caught up some, current wait is about 3-4 weeks.
     
  8. racespecferrari

    racespecferrari F1 Veteran

    Jan 31, 2006
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    Pete.G By The Sea
    #8 racespecferrari, Mar 8, 2006
    My friends made an awful noise a bit like a Vw Beetle on tickover but once you revved it it was then fine, he had the manifolds remade just using the flanges here in the Uk for £350 each
     
  9. RossoCorsaItaly

    RossoCorsaItaly F1 Rookie
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    #9 RossoCorsaItaly, Mar 8, 2006
    If the leak is minor then rebuilding the manifolds is a great idea. But at times when the damage is major, rebuilding at times is not worth the money spent.We recently started rebuilding manifolds and we're picky on what we do and don't rebuild for this reason.
     
  10. 2000YELLOW360

    2000YELLOW360 F1 World Champ

    Jun 5, 2001
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    Art
    #10 2000YELLOW360, Mar 8, 2006
    There are several threads about this. Essentially your options are: 1. Factory parts (they are improved, but still susceptible to cracking), 2. QVLondon, who rebuilds them with better material, or 3. Aftermarket products which get more HP.

    None of the above is cheap, QVLondon is probably the least expensive, but the labor is high because of the difficultly in replacing the manifolds.

    I'd also check the CATs. Make darn sure that they aren't plugged, which that can cause the cracking. If it's the cats, you can either use the factory parts, or aftermarket, hyperflow cats make more power than stock, so that's an option.

    No matter what you do, it's expensive.

    Art
     

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