Results 1 to 7 of 7

Thread: engine swap

  1. #1

    Join Date
    Nov 2011
    Posts
    6

    engine swap

    I am wondering if anyone has any experience with changing the motor on a kitfox or avid. Can larger engines be put on? Say from a 582 to a 912. What needs to be changed besides the engine mount and the cowling? Will the airframe need any modifications?

  2. #2

    Join Date
    Jul 2011
    Posts
    326
    Well, you'd certainly have to look closely at the weight and balance... and consider the effect of the additional weight, thrust, and gyroscopic forces on the engine mount and related structure.

  3. #3
    Todd copeland's Avatar
    Join Date
    Aug 2011
    Location
    Pittsburgh, Pa.
    Posts
    98
    Surely the kit fox is an airframe that the 912 is used on so I think it would be pretty straight forward, probably the same for the avid. If the factory supports those engines for the airframe it should be more a matter of $ and elbow grease than anything else.

  4. #4
    Jim Hann's Avatar
    Join Date
    Aug 2011
    Location
    Ballwin, Missouri, United States
    Posts
    344
    Remember there are lot of different versions of the Kitfox. All of the comments above should be applied carefully. Aviation writer Amy Laboda and her husband have a Kitfox that they built and later re-engined from a 582 to a 912 IIRC so it is possible, depending on which Kitfox it is.
    Jim Hann
    EAA 276294 Lifetime
    Vintage 722607
    1957 Piper PA-22/20 "Super Pacer"
    Chapter 32 member www.eaa32.org
    www.mykitlog.com/LinerDrivr
    Fly Baby/Hevle Classic Tandem


  5. #5

    Join Date
    Aug 2011
    Location
    FA40
    Posts
    436
    Quote Originally Posted by wyodan59 View Post
    Say from a 582 to a 912. What needs to be changed besides the engine mount and the cowling?
    i won't ask why you want to change, because you do, and it's yours, so...whatever. my limited experience with 532 on a long-wing avid flyer and 912 on a kitfox showed with the same payload the avid outperformed (by a whole bunch) the heavier kitfox in everything but cruise speed. the kitfox was about 6mph faster.

    a choice for more power on a bird with a 582 without changing engine mount, cowl, etc might be a larger rotax built on the same footprint. if you want to ask an expert about it, try "rotax rick" in naples, fl, 239-572-0021.

  6. #6

    Join Date
    Nov 2011
    Posts
    1
    I have made this swap with my Kitfox IV. After flying it for 12 years with the 582 I got a good deal on a 912 UL and upgraded. My engine actually came off another Kitfox (that owner was upgrading to the 100 hp 912 ULS which takes a bit sturdier mount) so I got the motor mount with it. Had to buy a muffler, throttle and choke linkages, Prop, various hoses etc. oil temp and pressure guages. Did not have to modify the cowl except cut a new hole for the exhaust pipe. The plane had worked well with the 582 and had made the trip from Wisconsin to Sun-N-Fun twice without any problems, But the 912 is the perfect engine for the airframe. Cruise speed is 10 mph faster while burning a gallon less gas per hour.

  7. #7

    Join Date
    Nov 2011
    Posts
    6
    I am wondering about this change because I live at 7000 feet. I have a friend with a paraplane powered with a 582. It struggles to fly with 2 soles when it is hot in the summer here.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •