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Thread: compression test

  1. #11
    Senior Member Paul's Avatar
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    Default Re: compression test

    Dan, thanks for keeping us posted on your CC O-340. Mine is sitting on the dock up in Yakima about to head south to my shop. Great to hear how well it's performing and with input from Randy and others, this thread will really help the rest of us as we begin breaking in our new engine.
    Thanks
    Last edited by Paul; 04-16-2014 at 01:39 PM.

  2. #12
    Senior Member Dan L's Avatar
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    Default Re: compression test

    I checked my compression again. There are 360 hours on it now and all four cylinders checked 78. Perfect.

    image.jpg

    Sluice Creek on the Oregon side of Hells Canyon in early March.
    Flying Carbon Cub EX #11

  3. #13
    Senior Member Paul's Avatar
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    Default Re: compression test

    Quote Originally Posted by Dan L View Post
    I checked my compression again. There are 360 hours on it now and all four cylinders checked 78. Perfect.

    image.jpg

    Sluice Creek on the Oregon side of Hells Canyon in early March.
    Good news Dan. And nice pIc. It was cool to read this post from almost a year ago with my CC340 sitting in Yakima...and fast forward today it has 50 hours of perfect performance in Arizona skies.

  4. #14
    Senior Member Dan L's Avatar
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    Default Re: compression test

    I bumped my Condition Inspection up a month and part of that is a compression test. With 525 hours on the O-340 now they still check excellent with three 78s and a 79.

    image.jpg

    This is last week up the North Fork of the Flathead.
    Flying Carbon Cub EX #11

  5. #15
    Senior Member Dan L's Avatar
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    Default Re: compression test

    Since I've been making a report on this each year, I checked my compression again and am keeping it going. Still showing high numbers after 626 hours. Three 78s and a 77.

    image.jpg

    Yesterday afternoon. Even as low as the river there is plenty of snow in our valley. Sans snowshoes this area would let me sink to my thighs. These Carbon Concept carbon fiber skis really float well in the loose snow and provide a lot of AOA.
    Flying Carbon Cub EX #11

  6. #16
    Senior Member Dan L's Avatar
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    Default Re: compression test

    I had noticed an occasional miss that seemed to be ignition related so changed spark plugs as they were about due for a change anyway. The miss persisted. CC and Lightspeed recommend changing sparkpkug leads after 500 hours and I had not done that. So I ordered a new set and put them in last month. After a few hours of flying with the new leads the miss seems to be gone.

    I'll not go over 500 hours on this set. They were about $180 so not expensive either.
    Flying Carbon Cub EX #11

  7. #17
    Senior Member Dan L's Avatar
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    Default Re: compression test

    With about 10 hours on the O-340 now since the spark plug lead change I have not had one miss. Prior to the change out it was an every-flight experience. For those getting close to the 500 hour mark I'd recommend changing them before you get the miss.

    On a side note, I changed my prop out last fall for a different pitch Catto. I like to get props dynamically balanced and it didn't work out to do it until a few days ago (mostly because I was on straight skis all winter). It went from .39 IPS to .06" IPS. That is a big improvement and noticeable in the cockpit too. The prop guys like to see .15" IPS or better.

    I'm convinced everything on an airplane lasts longer when the prop is dynamically balanced. Interestingly the weight on the starter gear went into the same hole as the weight had been for the previous prop. I had it marked with a Sharpie.
    Flying Carbon Cub EX #11

  8. #18
    Senior Member Pete D's Avatar
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    Default Re: compression test

    Quote Originally Posted by Dan L View Post

    I'm convinced everything on an airplane lasts longer when the prop is dynamically balanced. Interestingly the weight on the starter gear went into the same hole as the weight had been for the previous prop. I had it marked with a Sharpie.


    I 100% agree.
    Pete Dougherty
    R & D Shop Manager
    Cub Crafters Inc

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