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Thread: Jabiru 3300

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  1. #1
    kitfox5v's Avatar
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    Default Jabiru 3300

    Can anyone shed some light on over heating problems with the 3300 late model engines. Thanks

  2. #2
    Senior Member War Eagle's Avatar
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    Default Re: Jabiru 3300

    I don't know anything about the Jabaru in a Kitfox but I have a hanger neighbor that has the 3300 in a Zenith 601XL.

    He has to watch his temperature a lot. He has told me that the prop he is using does not move enough air into the cooling vanes on the engine. Supposedly there is limited air flow into the engine near the propellor hub.

    I understand there are some props that move more air near the hub than some others.

    When I was at Arlington one year I spoke to the Jabaru dealer there and he mentioned the specific need to have enough air flowing over the engine and that some props were better than others. I don't remember which props he suggested. As I recall he also named some that were bad actors when it comes to moving air at the hub.

  3. #3
    kitfox5v's Avatar
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    Default Re: Jabiru 3300

    Thanks War eagle, Im building a 5 and just looking at all options. Im not ready yet but just wondering. How do you like your rotax?

  4. #4
    Senior Member War Eagle's Avatar
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    Default Re: Jabiru 3300

    When I first investigated building a Kitfox I talked to as many people that owned or built Kitfoxes that I could find.

    That amounted to several dozen people. In my discussions the powerplant options always seemed to be a part of those discussions.

    I was biased against using any kind of engine that required a gear box or speed reduction. I thought the extra complexity compared to a direct drive engine was a reliability issue.

    But after talking to Kitfox owners and doing a fair amount of reading and talking to other people like Lockwood, Rotech, Lycoming and a few others I began to hear great things about the reliability of the Rotax series 9 engines.

    I looked at aircraft sales and saw the Rotax installed Kitfoxes were getting better sales prices than some other engine combinations.

    The short of the long story for me was that I completely changed my bias against Rotax engines and there we several things that did it for me, but the reliability, technical experience factor of Rotax manufacturer, power to weight ratio and the resale value were big hitters for me.

    Now not everything is perfect about Rotax. One of those is price. They are very expensive. A lot to do with that is the weak US dollar. But recognize most things to do with airplanes are expensive, but there are other power options for the kitfox that are less expensive than the Rotax if you are just comparing acqusition price.

    But I tried to look at the whole value proposition associated with the purchase of a Rotax engine and when I did that I came to a conclusion that Rotax was a better choice for me.

    There are specific things you need to do to take care of the engine but it has been strong and reliable for me and I am happy with the choice.

  5. #5
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    Talking Re: Jabiru 3300

    I have a 2200 Jabiru in the Avid that I crashed. I put about 400 hrs on that engine, and eventually I plan to fly it again once the plane is rebuilt. As far as props that don't move air near the hub, Warp Drive comes to mind right off the bat. I did run one without problems though. Wood props are carved/curved much closer to the center than the Ward Drive. I think the 3300 is harder to cool than the 2200 also. I haven't put any time on a 912 yet, but that is the engine I would go with judging from what I've read and heard. Lots of happy though poorer people running them. Keep your eyes open, a good used one will come along if you can wait for it. If you are just starting to build, it'll be a while before you need the engine anyway. That's my 2 cents worth, and worth every penny you paid for it! LOL Take care, Jim Chuk

  6. #6
    Senior Member Esser's Avatar
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    Default Re: Jabiru 3300

    If you build a proper air tight plenum you should solve all your heat issues. Ever notice that Reno Air Racers running these mammoth engines have smaller cooling intakes on their planes then the kitfox has? Most peoples air cooling set ups waste a ton of air. A good air tight plenum uses every piece of air coming into your cowl to cool. A book that has a good chapter on this is Speed with Economy by Kent Paser.

    http://www.actechbooks.com/products/act585/

  7. #7

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    Default Re: Jabiru 3300

    I've been investigating putting on a Jabiru 2200 on my Kitfox IV project.
    But because this is my first plane, and due to the fact that all 6 Kitfoxes flying in the Nehterlands are Rotax-equipped, I thought it might be wiser to stay with the familiar type and the experience that comes with it.

    However, from that investigation time I learned that for any Jab it is very important to find a way to get hot air OUT of the cowling - in stead of getting more cool air IN.
    Jabiru airplanes are equipped with a kind of 'lip-edge' at the underside of the air-outlet, to make under-pressure, and suck more air out of the cowling.

    Given the massive air-inlet the 'older' (up to IV) Kitfoxes have with the round cowl, inlet should be no problem...

  8. #8
    WISDAN's Avatar
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    Default Re: Jabiru 3300

    Hans,

    I built a kitfox IV with a Jabiru 2200. I modified a Sky Fox cowl and installed it per advice from Dave J. From New York State. I have no issues cooling my engine even when it's the weather is warm. I now have over 70 hours logged flying. if you have any questions just let me know.

    Dan G.

  9. #9
    Senior Member Wheels's Avatar
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    Default Re: Jabiru 3300

    Chuck Lutgerote is completing a pressure cowl install on a Zenith 750 and has a lot of data on the cooling problem. I saw the pattern he is installing and he is anxious to see the summer heat test out his theory. The bottom line is, a lot of airflow goes right over the engine and never goes through the cooling fins. His fix should solve that problem. Give him a call.
    He is on the Zenith Forum.
    He's in Sandpoint Idaho.

  10. #10
    kitfox5v's Avatar
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    Default Re: Jabiru 3300

    Anyone heard anything about the heat issues on the Jabiru 3300 lately

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