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Thread: proper leaning, premiun auto gas in an emergency

  1. #31
    Senior Member
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    Jan 2010
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    nevada
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    171

    Default Re: proper leaning, premiun auto gas in an emergency

    I don't know how to post a photo on this forum or I would.
    At 2590 rpm breaking in a new motor with a OAT of 55 degrees
    1-282
    2-350
    3-323
    4-318
    Fuel flow -8.9( which seems very low as well?)
    max oil temp 136

  2. #32
    Senior Member
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    Jan 2010
    Location
    Edgewood, Texas
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    214

    Default Re: proper leaning, premiun auto gas in an emergency

    During the first flight for my engine break-in here is what the Dynon D-180 showed at 3000' / 48F and 2580 RPM:
    CHTs
    1-305
    2-305
    3-343
    4-347
    Fuel flow 12.7
    Oil temp 179 with vernatherm

    Jon
    CC #293

    Quote Originally Posted by rowdyroyce View Post
    I don't know how to post a photo on this forum or I would.
    At 2590 rpm breaking in a new motor with a OAT of 55 degrees
    1-282
    2-350
    3-323
    4-318
    Fuel flow -8.9( which seems very low as well?)
    max oil temp 136

  3. #33
    Senior Member randylervold's Avatar
    Join Date
    Jan 2010
    Location
    Yakima, WA
    Posts
    1,378

    Default Re: proper leaning, premiun auto gas in an emergency

    Folks, I don't want to drift this thread (see topic) but as Royce pointed out indeed we are seeing cooler CHTs from the CGR30 as well. We have been working diligently behind the scenes for some time now with not only E.I., but our three other engine instrument suppliers, to resolve the discrepancy. Yes, a TSO is a fairly rigorous standard, but hiding behind it by saying "it's TSO'd, therefore is has to be accurate" is dangerous and I'm not buying that line.

    We have several issues across several of our aircraft that we need accurate CHT data for and have been on this pretty hard for quite a few months now. As of this writing we don't have an answer but are learning more about all the nuances of CHT instrumentation than we ever wanted to know. As soon as we can explain the discrepancy we will let our owners know what we found.
    Randy Lervold

  4. #34
    Senior Member
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    Jan 2010
    Location
    nevada
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    171

    Default Re: proper leaning, premiun auto gas in an emergency

    Thanks Randy. I feel confident that Cubcrafters will figure it out .

  5. #35
    Junior Member
    Join Date
    Feb 2016
    Location
    Midland, TX
    Posts
    3

    Default Re: proper leaning, premiun auto gas in an emergency

    Just for fun today on a long cross country I decided to check my CHT & IAS at different RPM settings and different FF settings. I did all the test at the same altitude and the OAT remained constant. I started at each RPM setting the way I normally lean the engine. Set my RPM, lean until my RPM starts to drop, increase FF 1 or 2 clicks to regain RPM and engine is running smoothly. For subsequent FF adjustments I just added about .3 to .5 gpm to see where the readings ended up. After each adjustment I allowed time for all readings to stabilize.

    Altitude = 4,800 MSL
    OAT = 65 deg F

    RPM FF CHT IAS (MPH)
    2200 5.2 356 88
    2200 5.7 371 88
    2200 6.2 385 88

    2300 5.8 354 93
    2300 6.1 371 93
    2300 6.6 394 93

    2400 7.1 383 96

    I do not like to run my engine over 380 deg F for extended periods so I only did the initial test at 2400 RPM.
    Last edited by John C; 06-04-2016 at 01:58 PM.

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