355 Exhaust manifold HPC coating | FerrariChat
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355 Exhaust manifold HPC coating

Discussion in '348/355' started by New Zealand 355GTS, Sep 22, 2009.

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  1. New Zealand 355GTS

    New Zealand 355GTS Karting

    Sep 23, 2006
    80
    Wellington New Zeala
    Full Name:
    Jonathan Paape
    #1 New Zealand 355GTS, Sep 22, 2009
    I have searched this site to see how others have got on with HPC coating the exhaust manifolds.

    I have had the usual blown exhaust headers and had them rebuild by a friend who makes racing motorcycle exhausts for a living.
    What I am asking is for comments on how I intend to run my car in future.
    1. Have the manifolds HPC coated to a 1400 degree spec
    2. Put the top half of the heat shields back on to keep the standard look.

    Regards
    New Zealand 355 GTS
     
  2. fastmikey

    fastmikey Karting

    Aug 11, 2006
    111
    Auckland
    Full Name:
    Mikey
    #2 fastmikey, Sep 27, 2009
    Hi Jonathan,

    I need mine done - have you got some details of your guy? Also, did you not put the heatsheilds back on? hows that going?


    Cheers



    Mike
     
  3. New Zealand 355GTS

    New Zealand 355GTS Karting

    Sep 23, 2006
    80
    Wellington New Zeala
    Full Name:
    Jonathan Paape
    #3 New Zealand 355GTS, Sep 27, 2009
    Its being done Auckland to a 1400 degree spec. When I get them back and pay the bill I will tell you who is doing it.
    They have to be blasted first and coated inside and out.
    One disadvantage is if it needs a further repair it cant be welded over and needs to be blasted (sand or bead, not sure), that's why I'm paying twice the $ figure to go from 700 to 1400 degrees so hopefully they will last.

    I am putting the top half of the heat shields on so it looks like it left the factory.
    I have had extra fixings put on the manifold to hold the shield securely and stop any resonance.

    The heat shield box without fiberglass inside it is must hold the heat in incredibly.

    I figure with HPC coating it will reduce under hood temp a huge amount.

    The guy who did the manifold repairs is really great and MILES cheaper than other prices paid in NZ>

    Regards
    JP
     
  4. Club_Sport

    Club_Sport Rookie

    Aug 11, 2009
    44
    Philadelphia, Pa
    #4 Club_Sport, Sep 27, 2009
    You are going to have flaking problems with a header coating that only withstands 1400F
     
  5. saw1998

    saw1998 F1 Veteran

    Jun 8, 2008
    8,237
    San Antonio, Texas
    Full Name:
    Scott
    #5 saw1998, Sep 27, 2009
    Jon:

    Although you're in New Zealand, so it's quite a distance, many people on this Forum seem to be quite interested in Swain Tech Coatings - highly heat resistant and very resilient.
    LINK: http://www.swaintech.com/store.asp?pid=10323

    I am also curious why you are only mounting the upper-half of the OEM heat shield. I, personally, would consider coating the headers and then replacing the entire heat shields with the addition of new (or even better) insulation. Yes, it's a dual-edged sword - as the internal heat within the shielded header unit will shorten the life-span of the header, but will greatly reduce underhood temperatures which, themselves, cause a plethora of problems (e.g., destruction of the OEM electrical cables and connectors, alternator malfunction, etc.).

    What ever you decide, I hope it works-out well for you!
     
  6. James-NZ

    James-NZ F1 Veteran

    Jun 26, 2007
    5,822
    Hamilton, NewZealand
    Full Name:
    James
    #6 James-NZ, Sep 27, 2009
    Here is my .02c

    I would DEFINATLY replace the factory heat shields, both top and bottom, regardless of what coating you put on the header, reduction of heat in the engine bay is top priority. You also need to protect the surrounding equipment from any potential heat damage, engine mounts, CV boots, Alternator, a bunch of wires and plugs etc. I would also pack the heat shields.

    Not sure I would have the HPC treatment inside the pipes, if the coating fails the consequences could be horrendous:eek:.....I am not totally up to speed on the HPC process but can they just coast the outside of the headers?? Sucking back HPC coating into your cylinders is not going to look pretty.
     

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