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430 Black deposits on exhaust tips

Discussion in '360/430' started by Ray Smith, Sep 6, 2020.

  1. Ray Smith

    Ray Smith Formula Junior
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    May 17, 2020
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    Costa Mesa, CA
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    Raymond Smith
    Has anyone experienced this?

    While water is a normal byproduct of the combustion cycle, water mixed with this black residue would lead me to believe the engine is running rich, way too rich, and this sooty material is a byproduct of that. After a long drive there is black gunk all over the paint and it runs down underneath leaving black streaks. They come off with some detail spray, that's not the problem. It occurs on both sets of exhaust tips so it's both banks. Running rich is not as dangerous as running too lean (which causes cylinder head temperature to rise, it's the way we lean an aircraft engine at altitude) but it may be indicative of another problem.

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  3. 24000rpm

    24000rpm F1 Rookie
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    that's normal. No matter how lean you run your engine, if you hook up a gas analyzer, there will be carbon hydrates ( unburnt fuel)., thus the soots you see if you run the car long enough.
     
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  4. Need4Spd

    Need4Spd F1 Veteran
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    Feb 24, 2007
    6,074
    Silicon Valley
    Yes, normal and very annoying. Try to adjust your exhaust so the tips protrude enough so the condensate doesn’t drip on your bodywork. It has acid in it, so stains are difficult if not impossible to remove.


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  5. Ray Smith

    Ray Smith Formula Junior
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    May 17, 2020
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    Thanks. I always wipe it off after I drive. Had a suspicion it was toxic.
     
  6. Danedingerson

    Danedingerson Karting

    Dec 26, 2011
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    Dane
    Sitting and warming up can make this worse.
     
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  8. whatheheck

    whatheheck F1 Rookie
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    Mar 27, 2006
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    Yep, it is normal for these engines and unfortunately there is no fix.
     
  9. E60 M5

    E60 M5 Moderator
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    Jan 2, 2006
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    Robert
    My RAM truck does it as well, not big deal. Grab some Mothers aluminum cleaner and every week or so give it a good cleaning or wipe down after every drive.
    Usually, the most damage is done during warm up when condensation appears on the tips.
     
  10. SoftwareDrone

    SoftwareDrone F1 Veteran
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    Jan 19, 2004
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    I found a little trick. Liquid wax (like Griots "Best of Show" wax) takes those stains right off.
     
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  11. Purch23

    Purch23 Karting

    Jul 2, 2019
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    CT
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    Dave
    My 430 does the same.
     
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  13. Apollo 11

    Apollo 11 Karting

    Feb 11, 2019
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    Randy
    I ceramic coated my car, so it wipes right off.
     
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  14. Purch23

    Purch23 Karting

    Jul 2, 2019
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    Mine wipes right off too.
     

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