Mopar 493 stroker check with endoscope through sparkplug holes

General Mopar Tech Discussions

  1. Jimmy Jakobsson

    Jimmy Jakobsson Active Member

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    Hi! I checked my 493 cui stroker with a endoscope through the spark plug holes and all 8 cylinders looked nice, it was only in one cylinder i see some black marks, same carbone dust. What can it be? Is it maybe a sharp edge on a ring or something so it builds up little carbon? The engine has go 400 problem free miles after cam break in and stands for a few mounth now in off season, i drag the engine around by hand a little now and check all cylinders with a endoscope. Is this something to care about? I send the pictures to a well known engine builder here in Sweden and he says it look fine, probably a sharp edge on a ring or something like that 1581015212727.jpg 1581015236227.jpg 1581016354145.jpg 1581016850161.jpg
     
  2. Builderguy

    Builderguy Builderguy FBBO Gold Member

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    From the photos looks like the line only goes as high as the compression ring so the "sharp edge" idea may be one explanation. Stuck ring my be another, as it would not allow the ring to ride (float) on the thin sheet of oil being held in the crosshatching. Would need to look at the ring chart to see if the line matches up with your mark. BTW, your endoscope is much better than mine! :)
     
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    • Jimmy Jakobsson

      Jimmy Jakobsson Active Member

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      Thanks for your answer! Ok so its not so much to worry about. The engine is only 400 miles old and when i assemb
      Hi! Thanks for your answer! I think it is with the oil rings actually. So it not so much to care about than. When i assembled the file fit rings i was extremely meticulous with the gap and the rings was also "free" in the piston, the engine is only 400 miles old so its barely broken in yet.
       
    • 440Coronet500

      440Coronet500 Well-Known Member

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      Looks like a burr was left on your file to fit compression ring. 440'
       
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      • Jimmy Jakobsson

        Jimmy Jakobsson Active Member

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        Thank you for your answer! Yes its possible, so nothing to worry about i suppose, the engine runs fine
         
      • Jimmy Jakobsson

        Jimmy Jakobsson Active Member

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        *compression ring i mean
         
      • Jimmy Jakobsson

        Jimmy Jakobsson Active Member

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        Im going to do a leak down test and get back with results.
         
      • Jimmy Jakobsson

        Jimmy Jakobsson Active Member

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        Hello again! I do a leak down test on the particular cylinder and it shows 7%, also all the others show 6-7% so i belive its all good
         
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