opinions on this Quadrajet chromate finish? original?

Discussion in 'About Us' started by techg8, Jun 30, 2015.

  1. techg8

    techg8 The BS GS

    in the continuing effort to achieve that elusive OEM finish on my refinished carbs, Ive got another finish for you all to check out.

    Let me know what you think.

    Its a washed out yellow chromate with light green and red iridescence,and its got that green tinge to it. I believe as the yellow fades it will become more washed in translucent greenish.

    any opinions on the look?

    P_20150629_164921.jpg P_20150629_164938.jpg P_20150629_172440.jpg
  2. ragtops

    ragtops Gold Level Contributor

    I can't speak to originality, but it sure looks fantastic.

  3. techg8

    techg8 The BS GS

    thanks. it is a little more subdued than the previous finishes. washed out is the term that comes to mind.
  4. SteeveeDee

    SteeveeDee Orange Acres

    That color looks much closer to what I am used to seeing! Now, just knock off a little of that shine (I know, I know, every plating chemical supplier wants shiny, and you can't talk 'em down). Anything I had plated at work, they would polish the substrate first. Then, the levelers just finished it :Dou: off.
  5. telriv

    telriv Founders Club Member

    IMHO that looks a LOT closer to stock/original than any of the other finishes.
  6. Skyhawk

    Skyhawk Well-Known Member

    Looks great Ken.
  7. Oldskewl59

    Oldskewl59 Silver Level contributor

    I like it. Looks like an "aged" original to me.
  8. techg8

    techg8 The BS GS

    I agree.

    here's the thing. New, the carbs were likely shiny yellow chromate. Because the castings were uncontaminated and freshly cast.

    NOS pieces we now see have aged, even if in the shrinkwrap, and take on a faded gold greenish tint. Open the top of an NOS piece and look underside the airhorn. Shiny yellow chromate.

    're-dyed or restored carbs generally come out with the faded gold greenish look because impurities and textures from age and or mediablasting marr the casting surface and spoil the chromate , fading it.

    not to mention the changes in chemicals mandated by the EPA.

    We are still working on the finish, this one isn't perfect, but I think it's a step closer.

    EDIT ...and I value and appreciate any and all feedback regarding the finish and what it should or should not be. Beauty is in the eye of the beholder.
  9. mrolds69

    mrolds69 "The Cure"

    I like this one the best, also. Actually, I like the one in your avatar! BTW...finally took off that 70 146 carb to tweak the settings and it does have the idle bleed holes.
  10. SteeveeDee

    SteeveeDee Orange Acres

    In all fairness, my memories of the color are tainted by memories of these in the near-new state, as I officially stopped working as a mechanic (for a living) when I graduated university in 1983. Given that, this sheen may be closer to reality than I originally thought. It also could be an artifact of the reality to camera to pic on the internet. You should see some pics I take, that by the time they are on the internet look like some thing from an alien movie.
  11. techg8

    techg8 The BS GS

    Yes there is that too. The pics only approximate the live view. And even in the real, the appearance really depends a lot on the ambient lighting.

    My goal is to achieve what most discerning viewers would consider a "correct" finish.

    So again I welcome all feedback and opinions.
  12. techg8

    techg8 The BS GS

    BTW I laughed aloud at this. Truer words have never been spoken. It's like banging my head against a brick wall sometimes.
  13. philbquick

    philbquick Founders Club Member

    If you know the chemistry and process involved in obtaining that finish let me know. I have two 3 X 2 setups and one 2 X 4 setup to do. American carburetor does a nice job of emulating the stock finish for $200ea. (X8).
  14. Briz

    Briz Platinum Level Contributor

    Like it. but id like anything that looked good and stayed that way. Keeping a clean engine bay is a really tough task.
  15. Jim Weise

    Jim Weise EFI/DIS 482

    I do believe the original production line body/air horn finish was olive drab chromate over the zinc castings.. from the inception of the Q-jet until the late 70's. At that time, they switch to a more "gold color" I believe it was an industrial version of yellow chromate.

    I have no doubt that you may have seen something different on an NOS carb. Often NOS stuff is not the same as the production line items, especially when it comes to plating/coloring. I certainly have seen NOS replacement carbs with the more gold color.

    Later vintage Q-jets do actually look very much like your pictures.

    That olive drab process is still available, Cliff Ruggles used to do it for me, but I actually now have started doing it in house, for carbs I do here.

    I mainly took on the plating so I could correctly plate the Primary and secondary air valves, clear zinc, and control the process of all the plating, to achieve exactly the look I am after.

    I applaud your pursuit of the correct finishes.

  16. mrolds69

    mrolds69 "The Cure"

    One problem I constantly see with "restored" carbs, is that they are way "over-restored" !!! Both the carbs on my Buicks are like that. They have yellow plated screws with lock washers?, yellow plated linkage + springs, yellow plated air flaps, etc. They look great kind of...but not to me!
  17. techg8

    techg8 The BS GS

    here is a pic of three for contrast.

    LEFT, the one we have been discussing.

    MIDDLE we tried to duplicate the last finish, but make it look "new" instead of washed out

    RIGHT is a standard light yellow chromate


  18. techg8

    techg8 The BS GS

    better pics individually

    P_20150629_164921.jpg P_20150702_161540.jpg P_20150702_161616.jpg
  19. SteeveeDee

    SteeveeDee Orange Acres

    Gulp (eating old words)- that light yellow chromate gets my vote, when you put them on display like that.
  20. tdacton

    tdacton Gold Level Contributor

    Fred Catlin is back to dying and building a few carbs. He has completely rebuilt my S1 carb that the local speed shop nicknamed, "goldie". The previous version of plating was just to yellow. When I get it back I will snap a picture. If you still have pics, we can compare.

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