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first stage rings? mch 5

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  • #16
    http://www.ebay.co.uk/itm/KDG-1100-V...UAAOSw32lYy-BD

    You want something that has a max flow of 30-35L/min

    30L/min is approx 63 SCFH using imperial scales.

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    Last edited by BritCNGUser; 06-20-2017, 03:02 AM.

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    • #17
      Been trying for a week to get a hold of Ray to order new rings and try again but he is AWOL. Where do you have this flow meter attached to the machine?

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      • #18
        If you have a gas meter you can use that to measure you flow, just make sure your not using anything that uses gas inside the home like hot water or the drier to throw off the reading.

        Count the revolutions of the meter turning for 60 seconds....this will give you your CFM, it should be about 3 CFM at 3500 psi

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        • #19
          Yes your gasmeter will help you judge when you are starting to get it right, but to judge that you're best to know what you started with, and I don't suppose you took that measurement. To continue the flowmeter gospel, I have two flowmeters on mine. The one off the sump (taken from the top tapping) into the flowmeter and returned from the flowmeter to the input port. I PM'ed you, even from Blighty that KDG model won't come much cheaper. It's GBP5.00 for cryin' out. Seller had a heap of them. I bought one. Usually i buy Yankside, but it can be hard to convince Yank sellers to sell outside the US. Many seem convinced the US 'is' the world.
          If you can't find better, get that one sent from Blighty. It's perfect because it's short enough not to cause oil-trap issues. If I get a mo' I'll send pics of my install.
          Last edited by BritCNGUser; 06-21-2017, 03:15 AM.

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          • #20
            I now have your definitive answer wrt the rings.

            See: https://www.gandini-industria.it/cat...-sub/P6075-000

            Spoke to Coltri. Technical say all rings, bevel-up.
            Last edited by BritCNGUser; 06-27-2017, 05:56 AM.

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            • #21
              I dont have one yet but i like the way the dingle ball hones work

              https://www.youtube.com/watch?v=jgDUzOxg2MU
              Last edited by trdscfjc; 06-28-2017, 01:38 AM.

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              • #22
                Flex-hones are the best for deglazing as they do not remove enough material to change the bore diameter. Just think fine, as in 400 grit or so. The coarser the cut, the more oil the cuts hold that is not wiped away. The fine cuts on properly finished bore are there only to hold a little oil to lubricate the rings.

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                • #23
                  I can vouch for a Flexhone. Great things, just very pricey our side of the pond, but a Yank product, so much cheaper for you. Had to do a brake caliper recon job recently, and just so happened to be a 60mm bore in the caliper too, so it got used again. But that was VERY lucky. Biggest snag is unlike the cheapo tripod 'efforts', they work over such a limited size range, you would need large sets of the things. Whereas the tripod covers the lot, although I won't pretend it is anything like as good.

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                  • #24
                    OK, Brit your up. New rings arrived today and will be installed bevel up. Wish me luck.

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                    • #25
                      Coltri1stStageRingFitment 27-06-2017 02.jpg Coltri1stStageRingFitment 27-06-2017 01.jpg

                      These pics not mine, these are from Italy, the horse's mouth... Coltri. If unmarked, all rings have a bevel, all bevels up. Note: 1) Second ring down has the step. 2) 2 x oil control rings. One, third ring down; One more, fourth ring down (at the very bottom). Which, ex-factory is not how mine came, but hey-ho... I notice they've changed the Parts catalogue since, so must be an update.

                      You lucky boy.
                      Last edited by BritCNGUser; 06-29-2017, 04:23 PM.

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                      • #26
                        good stuff brit

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                        • #27
                          Update. After 2 months of fighting with this and changing out rings I finally talked to a guy that has been been rebuilding cng compressors for years. Told him the problems I was having and he asked me what type of oil I was using. I told him and he laughed and said good luck with that. He was talking about oils and additives and lack of air in cng systems. Most of what he said went over my head but the point I did get was that full synthetic oil was to slick to seat the rings. He handed me a jug of Mobile DTE and told me to run that in my compressor for a couple of hours. This is the only oil he uses in compressors and I don't know what the long term effect would be on my little Coltri but it is tempting to try because it is about 20% the cost of Nuvair. I ran it for a couple of hours and it did seat the rings. Drained it out flushed the system and refilled with 751.

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                          • #28
                            Originally posted by alpacafarmer View Post
                            Update. After 2 months of fighting with this and changing out rings I finally talked to a guy that has been been rebuilding cng compressors for years. Told him the problems I was having and he asked me what type of oil I was using. I told him and he laughed and said good luck with that. He was talking about oils and additives and lack of air in cng systems. Most of what he said went over my head but the point I did get was that full synthetic oil was to slick to seat the rings. He handed me a jug of Mobile DTE and told me to run that in my compressor for a couple of hours. This is the only oil he uses in compressors and I don't know what the long term effect would be on my little Coltri but it is tempting to try because it is about 20% the cost of Nuvair. I ran it for a couple of hours and it did seat the rings. Drained it out flushed the system and refilled with 751.


                            that is similar to the CE750, one of the engineers @ RP told me the equivalent is NGL150, been using that for a few years...been happy with it so far, i live in a sunny climate so there is no need to change but they do have thinner and thicker versions that could be used depending on your ambient temps (thicker for warmer areas, thinner for colder areas)

                            wouldnt be a bad idea to have 2 types in stock (winter and summer oils)

                            Keep us posted AF

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                            • #29
                              I run Mobile Rarus 427. I have not had great luck running synthetics in most CNG compressors. The ones I did I would run 427 then change to synthetics after the first oil change.

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                              • #30
                                Cngmike, While running synthetics in various compressors what type of bad luck did you encounter?

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