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Timing chain slack/oil pressure

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  • #16
    Originally posted by eye-5 View Post
    Pressure seems fine then, mainly concerned with worn bearings but if that were the case, it would show in the oil pressure correct?

    Sent from my SGH-M919 using Tapatalk
    Yea, if your bearing clearance is huge, it'll show.

    If you scuff the bearings but the clearance is good - it won't show.

    Maybe worth it to drop the pan and check a rod/main or two if you're that worried about it.
    '18 Chevrolet Volt - Electric fun hatch for DD duty!


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    • #17
      Thanks for the reply. I don't really want to pull the engine but don't want to ruin a fresh one either. I'm sure you understand.

      Sent from my SM-P600 using Tapatalk
      Chicago Region SCCA SM # 688 http://www.scca-chicago.com
      TSSCC SM # 688 http://www.tsscc.org

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      • #18
        You can drop the pan and check the first few bearings without much issue IIRC. There is probably a windage try in the way, but I think it's accessible.

        Anybody else know if there's something major in the way to check the first couple of main/rod bearings in an SR that's installed?
        '18 Chevrolet Volt - Electric fun hatch for DD duty!


        DefSport Koni Sleeve and Spring Perch Buy!!!
        http://www.nissanroadracing.com/showthread.php?t=5902

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        • #19
          Send an oil sample to blackstone labs - they can tell you a lot

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          • #20
            Originally posted by jfryjfry View Post
            Send an oil sample to blackstone labs - they can tell you a lot
            That is a great idea. I've been asking some more educated than I about oil. A lot of them are using a service like this to determine the best oil for their application. The advice I'm getting based on their research is pennzoil platinum euro 5w 40 for my setup. I'm on 93 pump gas.

            When running E85, they like the Motul V300. However it is pricey.
            Chicago Region SCCA SM # 688 http://www.scca-chicago.com
            TSSCC SM # 688 http://www.tsscc.org

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            • #21
              Pretty hard to beat Mobil1 0W-40 for the price. It's what I'm planning on using on my new engine if that makes the oil pressure happy with the "on the loose side" of factory clearance.
              '18 Chevrolet Volt - Electric fun hatch for DD duty!


              DefSport Koni Sleeve and Spring Perch Buy!!!
              http://www.nissanroadracing.com/showthread.php?t=5902

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              • #22
                Mobile one 10w 30 is what I was using and appears to have broken down.
                Chicago Region SCCA SM # 688 http://www.scca-chicago.com
                TSSCC SM # 688 http://www.tsscc.org

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                • #23
                  How do you know it's "broken down?" Sheared down? Could be, but without a HTHS test, it's really hard to tell.
                  '18 Chevrolet Volt - Electric fun hatch for DD duty!


                  DefSport Koni Sleeve and Spring Perch Buy!!!
                  http://www.nissanroadracing.com/showthread.php?t=5902

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                  • #24
                    Agreed, I don't know for sure but when it happened, the oil seemed very thin like water. It did not appear right and it would explain why essentially changing the oil fixed the issue. I did change the pickup but the old one looked fine.

                    Sent from my SGH-M919 using Tapatalk
                    Chicago Region SCCA SM # 688 http://www.scca-chicago.com
                    TSSCC SM # 688 http://www.tsscc.org

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                    • #25
                      I went to the dyno, it's missing about 30 horse power and fuel pressure is dropping once it gets up there. I was watching the fuel pressure gauge as the tuner was doing pulls and it stayed right around 50 then the needle would start to drop higher in the rev range.

                      I had a Walbro 450 E85 pump ready to be put in so I did that after the dyno. I still have to wire it directly up to the battery with a relay. But I started it with the stock wiring just to make sure it worked.

                      The engine has been idling a little rough but once you give it gas it is fine. It's basically hunting for idle between 1200 & 900 RPMs. I'll check TPS and might as well change the fuel filter for good measure.
                      Chicago Region SCCA SM # 688 http://www.scca-chicago.com
                      TSSCC SM # 688 http://www.tsscc.org

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                      • #26
                        Iac?

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