bing bing bing BANG bing bing bing BANG

Discussion in 'Maintenance Bay' started by Magman, Jan 8, 2021.

  1. Magman

    Magman Pre-takeoff checklist

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    Colt with O-235 C1

    It sounds like one cylinder is developing considerably more oomph than the others.

    When aircraft is at 800 ft you can hear this on the ground.

    Does make Static but takeoff performance is poor.

    VERY noisy.

    Will be doing Spin type compression check and run up with

    different Colt props and Optical Tach.

    Could 1 cylinder be off a R-2800 ?

    More realistic would be from a high compression O-235 L2C or similar.

    Valve Lash in agenda.

    Other thoughts?
     
  2. Doc Holliday

    Doc Holliday Pattern Altitude

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    Do you have a link to translate your gibberish?

    Thanks.
     
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  3. Omalley1537

    Omalley1537 Cleared for Takeoff

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  4. murphey

    murphey Touchdown! Greaser! PoA Supporter

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    Need a backing rhythm guitar and B3 organ, and you’ve got a hit!
     
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  5. Roland Donnell

    Roland Donnell Filing Flight Plan

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    Will you guys stop it. I'm about to bust a vein in my head. :) To the OP I grew up watching the Little Rascals and working in my uncles gas station listening to customers mimic concerning sounds from their car so I understood your post. I would suggest for the best conservation of your energy that you check in with these guys. https://www.shortwingpipers.org/forum/
     
  6. Joe_B1

    Joe_B1 Pre-takeoff checklist

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    Spend some quality time with an A&P mechanic!
     
  7. Bill

    Bill Touchdown! Greaser! PoA Supporter

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    This page intentionally left blank
    When it starts going bada bing bada BOOM I’d be concerned.
     
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  8. flyingron

    flyingron Touchdown! Greaser! PoA Supporter

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    I thought you were describing the student pilot click, click, click, click, BANG! mag check.
     
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  9. Hang 4

    Hang 4 Cleared for Takeoff

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    I'd suspect an exhaust leak. Hole in, or loose, manifold, Cracked head. Can't think of a scenario where one cylinder makes more power. For sure I'd not test it in the air.
     
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  10. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Touchdown! Greaser! PoA Supporter

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    Exhaust Leak as mentioned above. Bad baffles in yea olde muffler (assuming there is one) also seems likely. Why test with a different prop (if I am reading correctly)? Higher compression cylinder? How would that make it sound louder? Takeoff is poor as compared to what? Valve lash - looking for a bad cam?
    Shake rattle and roll would be an indication of 1 good, 3 bad cylinders - got that?
    Compression test (either leak down or compression) can't hurt and is easy to do.
     
  11. texasclouds

    texasclouds Cleared for Takeoff

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    I bet the muffler bearing is about to let loose. Take it to NTB Tire so they can replace it for you.
     
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  12. wsuffa

    wsuffa Touchdown! Greaser!

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    The best part of the Car Guys was hearing callers try to mimic the noises their cars were making.
     
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  13. Deelee

    Deelee Cleared for Takeoff

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    Hahah I heard one of these in the runup box yesterday... Aviation Adventures 172... engine running fine.... increased RPM (ok, he's doing a runup).... then..... BOOM!

    Too many clicks left buddy, too many clicks left.
     
  14. NordicDave

    NordicDave Pattern Altitude PoA Supporter

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    Thought he was talking about a colt single action Army cowboy gun.
     
  15. Magman

    Magman Pre-takeoff checklist

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    “Poor Performance “ is by comparison to Owners previous Colt.

    It could be 3 weak cylinders and 1 good one for whatever reason.

    The reason we will try another Prop is that Hangar Fairies have been

    known to cut tips or re-pitch Props to put Static RPM in limits.

    Would not affect sound but would affect Performance.

    “Spin type Comp Test” may show if High Comp Piston is installed in

    one position.

    A Leak down check would not.

    It flew 1000 miles to get here.

    That may be further than many “Pilots” have ever flown.
     
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  16. Deelee

    Deelee Cleared for Takeoff

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    I have to quote Dr. Holliday after reading this last post:

    What browser are you using that makes the text break like that at the most irritating moment?

    It is
    almost like a Haiku but
    not really. But similar because
    the
    words just seem to
    end up on
    a
    new
    line for some reason. Why?
     
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  17. unsafervguy

    unsafervguy Pattern Altitude

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    when it does that, fagetabot it...........
     
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  18. AeroLudite

    AeroLudite Pre-Flight

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    I thought that’s what Colts sound like.
    The one based at my airport sounds like that...