Color of PB Check Valve C2 - NCRS Discussion Boards

Color of PB Check Valve C2

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  • Larry M.
    Very Frequent User
    • January 1, 2002
    • 535

    Color of PB Check Valve C2

    The three photos are of repros, two claiming to be 100% correct. The yellower one has the three little circles at 120 degree spacing around the center which matches my original on the car. I don't think the others do. Has any one seen the yellower color on an original?

    The yellow one is ebay...don't know who makes it.
    The nylon color is ebay pacecarjeff...priciest
    The other is ZiP products which I first saw on this forum..They confirmed it does not have the circles. Interestingly it appears to have a white coating on it. My original does also but it could be age degradation. I rubbed it with laquer thinner and it did not come off. Has anyone else seen the white coating on an original?
    Attached Files
  • Michael J.
    Extremely Frequent Poster
    • January 27, 2009
    • 7073

    #2
    Re: Color of PB Check Valve C2

    Here is a picture of my low mile original '64. It is white under the aged coating that is flaking off.
    Attached Files
    Big Tanks In the High Mountains of New Mexico

    Comment

    • Larry M.
      Very Frequent User
      • January 1, 2002
      • 535

      #3
      Re: Color of PB Check Valve C2

      The guy on ebay who sells the yellowish one also has a pure, pic attached. I would call the color under Michael's flaking coating to be "natural" nylon. I think mine is the same but my coating is not peeling...but if I pull it away from the booster the nipple is not coated.

      Now I'm wondering if they were all coated in 64
      Attached Files

      Comment

      • Enzo C.
        Very Frequent User
        • January 12, 2012
        • 533

        #4
        Re: Color of PB Check Valve C2

        Hi Larry, in my most honest opinion I believe that all 3 are repops... my car has the correct one .....and has been proven at national and 2 regionals last year to be 100% correct...they are hard to find but come up every so often... thanks.
        Attached Files
        Enzo Colosimo
        Ncrs Ontario Chapter Chairman 🇨🇦
        ENZ-Z06/67

        Comment

        • Michael J.
          Extremely Frequent Poster
          • January 27, 2009
          • 7073

          #5
          Re: Color of PB Check Valve C2

          Maybe, but other than a point for condition, no deducts at regionals and nationals for mine.
          Big Tanks In the High Mountains of New Mexico

          Comment

          • Enzo C.
            Very Frequent User
            • January 12, 2012
            • 533

            #6
            Re: Color of PB Check Valve C2

            Agreed we are at the judges discretion and sometimes things slip through the cracks...
            Enzo Colosimo
            Ncrs Ontario Chapter Chairman 🇨🇦
            ENZ-Z06/67

            Comment

            • Joe R.
              Extremely Frequent Poster
              • July 31, 1976
              • 4547

              #7
              Re: Color of PB Check Valve C2

              Would you believe the "coating" is just the plastic oxidizing from heat and other factors under the hood? These cars and others were not designed to last over 50 years! Plastics were not developed as they are now! Yellowing, cracks and complete crumbling were the nature of plastics in the 1960's. Space travel was not the thought of the day!

              JR

              Comment

              • Larry M.
                Very Frequent User
                • January 1, 2002
                • 535

                #8
                Re: Color of PB Check Valve C2

                For the record I know that every pic I posted is a repro....my question was this: what were the color variations of originals?

                The white coating on mine (which appears to have been duplicated somewhat on the ZiP repro) may in fact be what Joe Ray suggests. Mine is still intact. I don't know if it functions correctly. My only concern at this point would be a vacuum loss. I'd like to buy a back up.

                Comment

                • Michael J.
                  Extremely Frequent Poster
                  • January 27, 2009
                  • 7073

                  #9
                  Re: Color of PB Check Valve C2

                  Originally posted by Joe Ray (1011)
                  Would you believe the "coating" is just the plastic oxidizing from heat and other factors under the hood? These cars and others were not designed to last over 50 years! Plastics were not developed as they are now! Yellowing, cracks and complete crumbling were the nature of plastics in the 1960's. Space travel was not the thought of the day!

                  JR
                  I think your theory is correct Joe. And as a chassis judge that is how I judge it too.
                  Big Tanks In the High Mountains of New Mexico

                  Comment

                  • Gene M.
                    Extremely Frequent Poster
                    • April 1, 1985
                    • 4232

                    #10
                    Re: Color of PB Check Valve C2

                    Nylon as produced "natural" as it is referred to as is not white. To make white pigment is added. The natural piss color is the nylon resin. I do not believe the valve is specific to the Corvette. Normal GM purchases of said parts are not single sourced and typical of more than a single cavity tool for such a small part. Knowing how industry works and practices for tool updates and maintenance, I expect to see slight differences in parts of the same part number.

                    Ejector pin marks (3) and surface ejection is a typical visual difference. Ring gates and standard gating is another option one could possibly see. So to say this part only exists as one specific configuration or physical appearance is not realistic discounting repop examples.

                    Comment

                    • Larry M.
                      Very Frequent User
                      • January 1, 2002
                      • 535

                      #11
                      Re: Color of PB Check Valve C2

                      Michael Johnson - does yours have the three ejector pin circles easily seen on Enzo's pic or two of my repos?

                      Comment

                      • Michael J.
                        Extremely Frequent Poster
                        • January 27, 2009
                        • 7073

                        #12
                        Re: Color of PB Check Valve C2

                        Yes, it does.
                        Big Tanks In the High Mountains of New Mexico

                        Comment

                        • Michael J.
                          Extremely Frequent Poster
                          • January 27, 2009
                          • 7073

                          #13
                          Re: Color of PB Check Valve C2

                          I wanted to follow-up, this morning I had time to take the original check valve in my '64 out and inspect it closely. There is a thin coating of light yellow/brown deterioration that flakes off, and it is white underneath that, but feels very chalky and porous. But, in checking the un-corroded and un-deteriorated inner tube that goes in the power booster, it is a more typical nylon type color and looks like new So Joe's theory of engine compartment oxidizing from heat, 52 years of age, etc. fits that. Since it is a fuelie it probably has run at higher temps than a base engine would up in that area too. So, I would suspect the nylon color is the original color for these.
                          Big Tanks In the High Mountains of New Mexico

                          Comment

                          • Joe R.
                            Extremely Frequent Poster
                            • March 1, 2002
                            • 1356

                            #14
                            Re: Color of PB Check Valve C2

                            Originally posted by Gene Manno (8571)
                            Nylon as produced "natural" as it is referred to as is not white. To make white pigment is added. The natural piss color is the nylon resin. I do not believe the valve is specific to the Corvette. Normal GM purchases of said parts are not single sourced and typical of more than a single cavity tool for such a small part. Knowing how industry works and practices for tool updates and maintenance, I expect to see slight differences in parts of the same part number.

                            Ejector pin marks (3) and surface ejection is a typical visual difference. Ring gates and standard gating is another option one could possibly see. So to say this part only exists as one specific configuration or physical appearance is not realistic discounting repop examples.
                            For several years I have had an automatic search on ebay that shows me every new listing for a "power brake check valve." Whenever I see what looks like a correct original of the type the judges want to see for 1967, I save the photos for reference. I have photos of about 40 such check valves, a few of which of which are attached.

                            From what I have seen, I have the following observations:

                            1) The most common version started life as an off-white ("piss color" as Gene describes it) nylon color. Portions that were exposed to ambient air in the engine compartment developed a white, chalky oxidation on the surface.

                            2) While most check valves appear to be entirely made of the same material, some have a distinctly different color for the top piece. My guess is that for some reason, this part simply aged differently, possibly because it was from a different batch of nylon.

                            3) All of them seem to have the three raised bumps, and it appears that one or more of the bumps have a marking of some sort. This could be just an unintentional characteristic of the molding tool.

                            My conclusion is that a "perfect" reproduction would have a uniform off-white nylon color with the three raised bumps. There may be other "correct" ways to reproduce this part using other color variations, but I think that a uniform off-white nylon color was the most common. The white chalky coating is simply oxidation from aging.

                            I have an early reproduction from LIC that uses a too-white material for the main housing and a translucent material for the top. I don't think that is how originals appeared as new, but it resembles some aged ones I have seen.

                            Recently I saw a different reproduction on ebay that had uniform coloring but was too white. The cost was low so I bought one to look at. I think it is a pretty good reproduction but the material they used looks too white to me.

                            I agree with Gene that there may have been some variation in the color of the originals when new, but I suspect that most of the variation we see today is due to different forms of aging.
                            Attached Files

                            Comment

                            • Enzo C.
                              Very Frequent User
                              • January 12, 2012
                              • 533

                              #15
                              Re: Color of PB Check Valve C2

                              Hi Joe, you are a wealth of knowledge and always ready to jump in and help... great information as usual .... Many Thanks
                              Enzo Colosimo
                              Ncrs Ontario Chapter Chairman 🇨🇦
                              ENZ-Z06/67

                              Comment

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