Rering or ????????
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Rering or ????????

  1. #1
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    Default Rering or ????????

    I probably know the answer, but....

    Got a 468 in a 9 second hydro N/A. About 130 passes on it. The last couple of races the blow by increased to where it totally covers the valve covers. It has file fit rings gapped at .024 both rings. It mostly turns 7400 with a few passes at 7800. I'm thinking ring seal. Is it rering time or is there some kind of option? I hate to tear down an engine thats running so good.

    Tim

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    Senior Member Futs's Avatar
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    I would do a leak down and isolate the problem first.

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    Talking miracle oil treatment

    Quote Originally Posted by River Rat 005 View Post
    I probably know the answer, but....

    Got a 468 in a 9 second hydro N/A. About 130 passes on it. The last couple of races the blow by increased to where it totally covers the valve covers. It has file fit rings gapped at .024 both rings. It mostly turns 7400 with a few passes at 7800. I'm thinking ring seal. Is it rering time or is there some kind of option? I hate to tear down an engine thats running so good.

    Tim
    got to be rings getting tired . end gaps are probably well past .030 now . do you want to be wiping up oil and have the power going down next season or pull it down now in the off season and get it fixed ?
    Quote Originally Posted by gn7 If your ran a cammer your odds of finishing WERE ZERO.

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    Futs I forgot to mention I did a leak down and it was 17% on all cylinders. Never tested it before that.

    Canuc Thats what I'm thinking. Just wanted to see if there was some thing I didn't know about. Like maybe some wonder oil. LOL

    Tim

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    Puke tank if you like the way it runs man.

    But leakdown for sure.

    Snake oil is good for peace of mind only.

    If the leakdown is good (acceptable) and you are getting oil flying blow by. It is valve guides. Pull the heads, freshen them up and it's painless.

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    What would "acceptable" leakdown be for the rings gapped at .024? It's 17% now.

    Tim

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    since as you say blow-by is increasing < something is going away> maybe a ringland --freshin up that motor before you have real motor problems just my 2 cents

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    Now is the time (off season) tear it down and inspect it. If the rings are worn out after 130 passes, you need to re-think your ring package and cylinder hone technique.

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    northern member Canuc's Avatar
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    Quote Originally Posted by flat601 View Post
    since as you say blow-by is increasing < something is going away> maybe a ringland --freshin up that motor before you have real motor problems just my 2 cents
    X 2
    Quote Originally Posted by gn7 If your ran a cammer your odds of finishing WERE ZERO.

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    You really didn't have to ask this, did you?
    Now's the time, the time is now...your engine will tell you (is telling you) what it needs, but are you willing to listen?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Warp Speed, this is the first motor I've built with this kind of power. This blow by at 130 passes seemed like a short time even though it took 5 years to do it.

    Steelcomp, Probably not. I just didn't believe my answer. I may be getting hard of hearing in my old age, but I think I'm hearing this now.

    Tim

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    Now that I'm thinking about it this could be from being hurt (but then you mentioned it is running good) or that 130 passes isn't very long in terms of run time, but they could be spent from heat cycles.

    What is your piston and ring combo?
    Do you remember what finish the cylinders had when new?

    I would tear it down and inspect it regardless. You have enough time on the engine to get a good "read" on everything. If it needs nothing, screw it back together and run it.

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    Quote Originally Posted by River Rat 005 View Post
    What would "acceptable" leakdown be for the rings gapped at .024? It's 17% now.

    Tim
    Acceptable depends on how much cleaning you want to do and if it is running the number.
    Over 10 is horrible. 4 to 7 is more normal..seen better, seen worse.
    I am sure after 130 passes it is due.
    If you don't want to tear it down, don't, and it will tear itself down soon enough. Ha ha
    Wags

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    Quote Originally Posted by Warp Speed View Post
    Now is the time (off season) tear it down and inspect it. If the rings are worn out after 130 passes, you need to re-think your ring package and cylinder hone technique.
    32.5 miles.....hummm.

    This probably has nothing to do with it, but have you checked the trq on the heads lately ?

    If you do re-fresh it do make sure you do a leak down and cranking compression test on it when its fresh and if not after every race every other.
    Speaking of cranking compression do you know what it is or was ?

    All 8 are they same (leak down) and is the pressure passing all 8 into the engine?


    Sleeper CP

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