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Thread: New Carbon Cub

  1. #1
    Member armaurer's Avatar
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    Sep 2011
    Location
    Sarasota, FL
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    52

    Question New Carbon Cub

    Just picked up new CC in Yakima and flew it to Florida.
    Noted from start that cylinders #3 and #4 run much hotter
    than #1 and #2 by about 100 degrees. The rear cylinders
    run right around 400 degrees all thirty hours from Yakima
    to Florida. Did not lean much as I did not want to let the
    cylinders run any hotter. Wondered if other new Carbon Cubs
    have had same experience. Trip was over 30 hours as I took
    the long way through southern California to avoid Rockies.
    Cheers
    Alan

  2. #2
    Senior Member Dan L's Avatar
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    Jul 2010
    Location
    NW MT
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    568

    Default Re: New Carbon Cub

    Quote Originally Posted by armaurer View Post
    Just picked up new CC in Yakima and flew it to Florida.
    Noted from start that cylinders #3 and #4 run much hotter
    than #1 and #2 by about 100 degrees. The rear cylinders
    run right around 400 degrees all thirty hours from Yakima
    to Florida. Did not lean much as I did not want to let the
    cylinders run any hotter. Wondered if other new Carbon Cubs
    have had same experience. Trip was over 30 hours as I took
    the long way through southern California to avoid Rockies.
    Cheers
    Alan
    I see temperature spreads similar to those when I'm running a fairly high percent of power. At lower power settings they all settle in very close to each other. Opening the cowl vents more may help level things out too.

  3. #3
    Senior Member turbopilot's Avatar
    Join Date
    Feb 2010
    Location
    La Quinta, CA
    Posts
    412

    Default Re: New Carbon Cub

    Quote Originally Posted by armaurer View Post
    Just picked up new CC in Yakima and flew it to Florida.
    Noted from start that cylinders #3 and #4 run much hotter
    than #1 and #2 by about 100 degrees. The rear cylinders
    run right around 400 degrees all thirty hours from Yakima
    to Florida. Did not lean much as I did not want to let the
    cylinders run any hotter. Wondered if other new Carbon Cubs
    have had same experience. Trip was over 30 hours as I took
    the long way through southern California to avoid Rockies.
    Cheers
    Alan
    There is a long thread about cooling the Carbon Cub on the forum. You should review it.

    Engine cooling has a 1:1 relationship to outside air temperature, so I would doubt you saw a constant 400 dF at the same power and mixture setting all the way from Washington to Florida.

    I have done a lot of work to cool and normalize my CHT's. #3 and #4 will almost always be the warmest cylinders in the CC. I have not been able to get all of my CHT's close together but have made pretty good progress.

    In my aircraft cruising at POH max continuous power I typically see the warmest cylinder running around the sum of "305" + "OAT in dF". So if the OAT is 80 my warmest CHT will be around 385 dF.

    Here is a screen shot of my CC from a few days ago. This picture was taken after running 2 hours at the same "max POH power setting".

    Bob Anderson, CC11-00316, N382RA

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