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Coloring for carburetors.

Discussion in 'The Hokey Ass Message Board' started by Don's Hot Rods, Jul 11, 2013.

  1. Don's Hot Rods
    Joined: Oct 7, 2005
    Posts: 8,319

    Don's Hot Rods
    from florida

    I just ordered the bases to convert the Rochester 2G carbs for my Olds engine to tripower type carbs. I am also going to rebuild the 3 carbs while I am at it and would like to tint them so they look new.

    What product have you guys found that gives the most realistic tint to Rochester carbs? I looked at Eastwood but the picture I saw there looked a little phoney. Are there any multi step processes that give good results and a long lasting finish ? Something that resembles the original gold color.

    I did a search and couldn't find anything. Thanks.

    Emanon likes this.
  2. landseaandair
    Joined: Feb 23, 2009
    Posts: 4,475

    from phoenix

  3. Don's Hot Rods
    Joined: Oct 7, 2005
    Posts: 8,319

    Don's Hot Rods
    from florida

    Thanks, that is a great start.

  4. Don,The crap Eastwood sells is nothing more than paint,,Tried it once,bad results

  5. BangerMatt
    Joined: Mar 3, 2008
    Posts: 465


    Agreed, looks nice until you get fuel on it.... on a carburetor....
  6. oj
    Joined: Jul 27, 2008
    Posts: 6,312


    I do the alodine thing. I prefer the powder form over the premix as sold by that airplane supply place.
    Heres' an example.

    Attached Files:

  7. If your interested,I have the original Ford formula for their concoction they called "bright dip". It was used for all of the carb coloring back in the day.

    Its some nasty shit including a coupla different acids.

    Not exactly the stuff that you want on your Wheaties in the morning.

    But if you want the formula,send me a P.M.

  8. The goldish color is a chromate coating. Like on the zinc plated hardware you see at the store that is gold color. You can't buy the good old stuff (hexavelent chroium is the active ingredient), but you can probably get trivalent chromium version. Go to a plating or chemical supply and ask for chromate conversion coating. Hex chrome is carcinogenic, so that is why no longer used or available for most part.

    You may also talk to a zinc plating shop and ask if they would just dip your carb bodies once you have them absolutely clean. For a few bucks they could do it and you would not have the problem of purchasing. Carb bodies are die cast zinc.
  9. powdercoater46
    Joined: Oct 27, 2009
    Posts: 246


    I painted mine with Krylon 2906 gold paint. Then I clearcoated them with Rustoleum clear engine enamel #248944. So far so good and they look just fine. The clear is supposed to be gasoline resistant.
  10. one2roc
    Joined: Oct 1, 2010
    Posts: 77


    Sometimes it's the simple solutions that are the best :cool:
  11. '51 Norm
    Joined: Dec 6, 2010
    Posts: 760

    '51 Norm
    from colorado

    I remember rebuilding the carbs on my tri power......I ran out of enthusiasm long before I ran out of carbs!
  12. tedster
    Joined: Mar 20, 2005
    Posts: 519


    I used the Eastwood paint on my carbs, been on them for two years, still look like the day I did them. If your carbs do not leak should not get gas on them right? The only problem I had was not enough ventilation when I painted them. What a high that was.
  13. tfeverfred
    Joined: Nov 11, 2006
    Posts: 15,792

    Member Emeritus

    If it's not a secret, could you post it for the rest of us?
  14. carbking
    Joined: Dec 20, 2008
    Posts: 3,292



    The instructions with the "Bright Dip" state clearly:

    "Do not attempt to brighten die cast or steel parts or partial assemblies with this solution."

    It was for use on brass castings!!!

    2 parts Sulphuric Acid 66 degrees
    1 part Nitric Acid 38 degrees
    Teaspoonful of table salt to each gallon of solution

    Put Sulphuric Acid into jar, then Nitric Acid, then salt, and let cool from six to eight hours.

    Castings to be brightened should be boiled three or four minutes in Caustic Soda Solution (6 to 8 ounces per gallon). Then dip directly into "Bright Dip", dipping in and out quickly. Rinse acid off in clear, cold water and five second, quick dip in the "Bright Dip". Rinse thoroughly and dip in HOT water, then swing until dry.


  15. carbking
    Joined: Dec 20, 2008
    Posts: 3,292


    A more modern dip for use with zinc alloy, as mentioned by 38Chevy454, used a combination of three acids, one of which was chromic acid. I don't think you can buy chromic acid without a permit. I no longer have this formula, and would not post it if I did still have it.

    Even if you can buy the chromic acid, not a good idea. This stuff is really nasty. Think about all the chroming shops that were closed down about 20 years ago. Messing with chemicals without the safety background and/or safety equipment is a good way to end your association with the hobby (or worse).

    There are companies out there that will do this work (the Holley Custom Shop is one). This is one area best left to the professionals.

  16. I use yellow chromate from Caswell.
    dip in 2% acid solution, (I use sulfuric, but muratic or hydrochloric will work)
    rinse twice in distilled water, blow dry
    soak in a 3% to 4% solution of yellow chromate and distilled water
    rinse in tap water, blow dry and let sit in the dark (yes) for 24 hours
    I then paint them with engine clear.

    "Brite Dip" is very dangerous, this is the next best choice.

    Attached Files:

  17. shop teacher
    Joined: Jun 23, 2007
    Posts: 225

    shop teacher

    Anybody try powder coat for the gold tint carbs - like on an original Holley? Thanks, Bill

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