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Thread: -12 or -32? was Carb Differences

  1. #61
    Todd's Avatar
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    Default Re: -12 or -32? was Carb Differences

    A logical approach, thank you.

  2. #62
    Stephen's Avatar
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    Default Re: -12 or -32? was Carb Differences

    I also agree, years ago during the big carburetor phase of automobiles I had a job rebuilding. Now as an AP I send out my much simpler aircraft carburetor.
    Quote Originally Posted by Gilbert Pierce View Post
    https://msacarbs.com/pdf/SB-22_O%20N...l%20Nozzle.pdf

    I let the professional cab shops do the aircraft carbs since they flow the carb on a test bench after working on them. Automotive carbs I have no qualms about tearing into. I assume from reading the service bulletin you can do it if you have CC11-160 Aircraft Maintenance Manual. The SB says after completion of the installation to make a logbook entry. A repair station did mine and sent me the 8310-3 maintenance release and made a look book entry siting the 8310-3 work order.
    Sent from my BTV-W09 using ShortWingPipers.Org mobile app
    "You can only tie the record for flying low."

  3. #63
    Gilbert Pierce's Avatar
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    Default Re: -12 or -32? was Carb Differences

    Quote Originally Posted by Gilbert Pierce View Post
    Attached is a picture of my UBG16 after the nozzle change. The CHT's, the bottom bars are only 19 Degrees apart. The bars change at each 30 degree increment even though 2 cylinders had 2 bars and 2 had 3 bars they are only 19 degrees apart.
    I lost all my download data after the nozzel change. Typically I see cylinders 1,2, and 3 about 1 to 2 degrees apart and #4 10 to 20 degrees lower depending on power setting. Go Figure. I've checked everything on #4 and can only attribute it to the new cylinders I put installed in January 2018. Prior to that #4 had the highest EGT.

    Prior to the nozzel change the bars never lined up. Typically the CHT's's had a 50 degree spread low to high and the EGT's had a 130 plus or minus spread. All of this is 75% power setting leaned.
    Power settings and leaning make a big difference in the temperature and spreads.



    Attachment 15991
    Flew today to get some Ten-a-see BBQ. Leaned at 3000, 2525 rpm (75% power) my EGT spread was 47 degrees and my CHT spread was 6 degrees. At lower power setting the spreads are little larger. Prior to the nozzle change I saw spreads likes these only above 7500 and full throttle: the throttle was not partially blocking the throat disrupting the fuel/air distribution. Bottom line the new nozzle with all the holes in it provides better mixture distribution.

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