cylinder wall scratches

Discussion in 'Engine Topic' started by jpe, Aug 24, 2014.

  1. jpe

    jpe Member

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    What do you say about these scratches found in couple of cyliders? Good to bolt heads and go or should i lift the motor and rebuild it? I can feel the scratches with my finger nail, but the nail does not stop to them. Motor eats some oil, but not much at all, i think that valve quide seals are bad and that's why it eats some.

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    Before cleaning pistons, so it burns some oil.

    [​IMG]
     
    Last edited: Aug 24, 2014
  2. Damon

    Damon Veteran Member

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    If it's a "just get it running again" type operation, then go ahead and button it up. Anything more than that, I'd pull the motor and at least have the cylinders honed out again. A couple of those vertical scratches are fairly normal on just about any street motor, but you've got a lot more than a couple.
     
  3. hhott71

    hhott71 R.I.P 11/19/18 Lifetime Gold Member

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    Normal.
    Run it as is.
     
  4. CNC BLOCKS

    CNC BLOCKS Veteran Member

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    Interesting I don't see cylinders scored like that with my engines,
     
    Last edited: Aug 25, 2014
  5. Bikefixr

    Bikefixr Veteran Member Lifetime Gold Member

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    Run some 400 grit over it and button it up.
     
  6. Damon

    Damon Veteran Member

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    Obviously, you care too much about your work and don't drop the recommended handfull of sand down the carb after break-in.

    ;)
     
  7. stevenp3762

    stevenp3762 BANNED

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    I agree, button it up band run it. Being in Finland might also give more headaches if you tear into it. it looks normal from your Picts.
     
  8. jpe

    jpe Member

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    Yes you are right about headaches getting getting parts here. I need to order basically everything from Summit and it means about 100$ postage plus 25% taxes and 6% tolling on top of that for every order. So you really do not want to forget anything when ordering.
    Also machining work is quite expensive here, so maybe i'll just bolt my vortec heads on and run it as is for now. With the heads it will be 8.6:1 dynamic compression (10.7:1 static), so we'll see how it holds up.

    All these scratches are in exhaust side of cylinder walls only, so maybe it has been overheated at some point? Pistons are KB hypers with quite tight tolerances. Motor is 383 stroker.

    Thanks!
     
    Last edited: Aug 25, 2014
  9. ZS10

    ZS10 Moderator Staff Member Lifetime Gold Member

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    Good reason to use an air filter.
     
  10. jpe

    jpe Member

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    Yes, exactly. This motor had K&N filter with K&N top when it bought the car. Now those are replaced by a good quality paper filter but but it seems to be too late.
     

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