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  1. #1
    Join Date
    Jun 2005
    Location
    Norton Cross
    Posts
    462

    Sidepipe melting paint

    Hi
    My paint on the nearside sidepipe exit hole looks like its started to melt - is raised and looks bubbly.
    The side pipes are about an inch from the body and have a good clearance (at least 10mm) between sidepipe and body cut out.
    The bubbling is only on the nearside - and only on one side of the exit hole.
    Anyone else seen this before. Seems strange that if it is heat related, it's only on one side.

    Thanks

    Pete


    IMG_1792.jpg
    Follow my progress here http://petesakcobra.blogspot.com

  2. #2
    Join Date
    Jun 2016
    Location
    Nantwich Cheshire
    Age
    52
    Posts
    273
    Pete,

    I noticed something very similar on one of AK’s demo Cars.
    When I asked Jon about it he said it was caused by putting the car on a dyno without cooling fans.
    Coincdentally I’m pretty sure it wsas the nearside too.
    Have you had yours on a dyno ??


  3. #3
    Join Date
    Jun 2005
    Location
    Norton Cross
    Posts
    462
    Hi Mike
    Yes mine was on a dyno a couple of weeks ago so that explains it.
    Good to know as I was worried that driving the car normally was causing it and was thinking it would get worse.

    Cheers

    Pete
    Follow my progress here http://petesakcobra.blogspot.com

  4. #4
    Join Date
    Mar 2009
    Location
    liverpool
    Age
    45
    Posts
    354
    So anyone else with sidepipes, put some protection if getting it dyno'ed

  5. #5
    Join Date
    Nov 2016
    Location
    Stevenage
    Age
    47
    Posts
    222
    Hi i'm wrapping my headers to reduce underbonnet temps i just wondered weather that makes the problem worse upon the exit bends at the heat is transferred to the bend? Do you have a stainless steel escutcheon plate thats also heating up thus cooking the paint? Going to speak to a paint man next week prior to paint

  6. #6
    Join Date
    Apr 2004
    Location
    East Leake, Nottinghamshire, England.
    Age
    54
    Posts
    9,458
    Yes the pipes will get hotter where they exit the wing but no idea by how much though.

  7. #7
    Join Date
    Sep 2010
    Location
    Nova Scotia
    Posts
    765
    I have had no damage to my paint where the exhaust exits. No metal escutcheons either. If you are using a modified engine, the factory idle timing is probably too retarded. This makes the exhaust very hot.

    On the other hand, if you're on a track pushing hard, I have no comment as I have never done that.
    John

    “A prudent person profits from personal experience, a wise one from the experience of others.”

  8. #8
    Join Date
    Nov 2016
    Location
    Stevenage
    Age
    47
    Posts
    222
    I shall use my laser thermometer on the wrapped side and compare to unwrapped side, i solved one issue where brake area to hot, since wrapping and shielding servo and pipes cool. Then theres the pipe ext heated paint etc. Hmmmm. Will check timing etc, my engine not tuned in yet.

  9. #9
    Join Date
    Sep 2010
    Location
    Nova Scotia
    Posts
    765
    The reason I mentioned timing is that my engine headers and side-pipes were extremely hot when I was timing my car and started at a very low BTDC number. As I kept increasing the advance, the exhaust heat kept going down and was eventually minimal at the advance setting that worked best for me.

    Another point is for those of you with a vacuum advance distributor. If you connect to the carb ported vacuum, there is no advance at idle (the vacuum comes on just a b it above idle). Using non-ported manifold vacuum will keep the advance up at idle and result in a cooler idling engine.

    This is all at idle. At speed, there should be enough air rushing by to keep the paint cool.
    John

    “A prudent person profits from personal experience, a wise one from the experience of others.”

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