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3900 Cam Bearing Spacers

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  • 3900 Cam Bearing Spacers

    Several people have had them made, but I don't know what cam/journal clearance they end up with after the spacers are installed and the bearings installed. ID and OD measurements basically, for the spacer. This was the first one I had made. The 2nd is still in the block as I need to get it on a table to knock it back out. ID was wrong on that one so I couldn't test fit a bearing. Should I get a 3900 cam bearing set and use those measurements for the OD? I don't know the compression rate, from press fitting them into the block vs the new ID vs old ID.

    Attached Files
    Ben
    60DegreeV6.com
    WOT-Tech.com

  • #2
    No help and no progress to report.
    Ben
    60DegreeV6.com
    WOT-Tech.com

    Comment


    • #3
      Got some help. I will get the specs finalized along with the design and see about getting a set made.
      Ben
      60DegreeV6.com
      WOT-Tech.com

      Comment


      • #4
        Hi Sappy any progress on the cam spacers

        Comment


        • #5
          I have a place that will make them in quantity, but I want to have 2 more test spacers made. The set I had made, because I thought I had it down, feels loose. I want to see what it takes to not fit the cam so I know the clearances. Money has been pretty tight since race season isn't happening, cams aren't available, ARP studs just got restocked, etc. Its picked up a little this month and now that I have a great source for making them, its back on track.
          Ben
          60DegreeV6.com
          WOT-Tech.com

          Comment


          • #6
            That is good to hear. Glad to see work picking back up. I want to do an other v6 swap and this looks like the best option.

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            • #7
              As an alternative, could the custom-made hot cams for the 3x00 engines be manufactured with the LZ4/9 cam journal diameter?
              I am imagining welding up the journals and grinding to size like a crankshaft repair. Obviously more cost but then you just use stock LZ4/9 bearings/clearance.

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              • #8
                Rather than bearing spacers, or weld/grinding, how about having shrink-fit rings made up to just take up the space between the 3x00 cam journal and the LZ4/9 stock bearings?

                It's nearly the same machining work as the spacers, without having to mess around with a bearing install tool. Just buy hot cam, stick in freezer, put slip rings in oven, fit over journals and let temperature normalize and they are stuck in place like a wheel bearing in a hub.

                There are some loctite products made for this type of work (shrink fit stuff, like cylinder sleeves) as extra insurance if desired.

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                • #9
                  https://wot-tech.com/cam-bearing-spacer-set.html
                  Ben
                  60DegreeV6.com
                  WOT-Tech.com

                  Comment

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