Kitfox Aircraft Stick and Rudder Stein Air Grove Aircraft TCW Technologies Dynon Avionics AeroLED MGL Avionics Leading Edge Airfoils Desser CPS Parts EarthX Batteries Kitplane Parts
Page 1 of 2 12 LastLast
Results 1 to 10 of 23

Thread: Classic IV build engine suggestions and WHY!

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1

    Join Date
    Apr 2019
    Location
    Drums, Pa
    Posts
    11

    Default Classic IV build engine suggestions and WHY!

    Ok I bought a KF IV fuse from a guy last year in PA (where I live) and I need to consider engine choices. I am considering the following:
    Rotax: 583 & 912
    Viking: 90-130

    Is the 582 a viable engine choice? Price seems to be right.

    912 I see just as much problems with this one as the 582....and the prices are staggering. Why? NOT Certified.... 582 priced right and looks to give good power.

    Viking engines have not heard much in the way of Viking powered KF's These are priced very well and complete package seems very nice. But that 582 keeps coming back....

    I'd like to keep the price low but really want reliability not going to go real fast or need super performance, Just don't want any surprises.

    FH~

  2. #2
    Senior Member jiott's Avatar
    Join Date
    Jun 2010
    Location
    Portland, OR
    Posts
    2,416

    Default Re: Classic IV build engine suggestions and WHY!

    You really need to decide first whether you want a 2 or a 4-stroke engine; there are major differences between the two. The 2-strokes have MUCH shorter TBO times, use lots more fuel for the HP they produce, are generally less reliable, and sound "funny" in my opinion. If you're OK with a 2-stroke, the 582 seems to be a good one.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  3. #3

    Join Date
    Apr 2019
    Location
    Drums, Pa
    Posts
    11

    Default Re: Classic IV build engine suggestions and WHY!

    Thanks for the good info and will be using it when I make my selection. I like how the four strokes sound too. The 582's sound like they are in a tin box. But the damn price is nice.

    FH~

  4. #4
    Senior Member
    Join Date
    Apr 2009
    Location
    Chisholm Mn
    Posts
    1,072

    Default Re: Classic IV build engine suggestions and WHY!

    I think the Viking engine will be pretty heavy. The Kitfox 4 I'm rebuilding now had a Subaru engine, and it had 20 lbs of lead in the tail to balance it out. Maybe the Viking is lighter, but maybe not. I have a 912 in the Kitfox 4 now, and hope to keep it under 650 lbs. That will be down from over 800 before with the Subaru. Not all of that extra weight can be blamed on the Subaru, but a lot of it can be. Another option perhaps is a Jabiru 85 HP 4 cylinder. I have close to 600 hrs on the one in my Avid Flyer and I like it. It comes in lighter then the 912, but I think an 80 HP 912 would out perform it in the same airplane. JImChuk

  5. #5

    Join Date
    Apr 2019
    Location
    Drums, Pa
    Posts
    11

    Default Re: Classic IV build engine suggestions and WHY!

    Ok thanks some really good info. All being considered.
    FH~

  6. #6
    Senior Member Dusty's Avatar
    Join Date
    Dec 2012
    Location
    Christchurch, New Zealand
    Posts
    316

    Default Re: Classic IV build engine suggestions and WHY!

    If your intention is to fly local (50mile) the 582 is a great engine but 70 mph is a realistic cruise v's 90 for he 912. I fly my brothers 4 with a 582 which outperforms my 912 powered 4 in takeoff and landing and is marginally lower climb rate. Add a passenger and the 582 starts to lag behind. Fuel burn surprisingly is similar per hour but at a different cruse speed! Both engines are are awesome and suite the 4 very well with the 912 at the upper end of the weight/cg limit of a 4. Your sensible choice is rotax be it 2 or 4 stroke.
    I have recently been flying with a jabaru powered Avid and although not a direct comparison it falls midway between the two in cruise but is not startling in takeoff or climb. From what I have seen here the 582 has a better reliability record.We have a few Viking powered aircraft (non kitfox) that are only marginally better than the 912 but their weight rules them out for a 4.

  7. #7

    Join Date
    Mar 2019
    Location
    Morris, IL
    Posts
    157

    Default Re: Classic IV build engine suggestions and WHY!

    I would also vote either 582 or 912, leaning toward the 912. I remember somewhere reading that the acquisition and operational cost even out about 800 hours if comparing new to new. This is because the 582 needs more frequent overhaul and consume more fuel.

    The reason I say 582 or 912 is because they are proven on this airframe, have installation kits, engine mounts, etc available. The 582 you can have about a 550 lb airplane. I'm hoping to have about a 600 pound 912 powered Kitfox for my project airplane. Might be wishful thinking though. Will have to see.

  8. #8

    Join Date
    Apr 2019
    Location
    Drums, Pa
    Posts
    11

    Default Re: Classic IV build engine suggestions and WHY!

    John,
    What is the furthest you have flown in a KF IV with the 582 in miles?


    EK~

  9. #9
    Senior Member
    Join Date
    Apr 2009
    Location
    Chisholm Mn
    Posts
    1,072

    Default Re: Classic IV build engine suggestions and WHY!

    Not John, but here is a video of Joey Myers flying on one of his trips between California and Idaho's Johnson Creek. His trusty 582 in an Avid Flyer. He has quite a few other vids if you look through his channel. Another guy who is on the AvidFoxFlyers Forum flew his 582 powered Avid from California to Conneticut. JImChuk
    https://www.youtube.com/watch?v=O5cqalZuONw tried the link after I posted it and it didn't work for me. look for Headed to McCall ILov2fly that's the name Joey goes by on utube.
    Last edited by avidflyer; 05-12-2020 at 09:29 PM.

  10. #10

    Join Date
    Apr 2019
    Location
    Drums, Pa
    Posts
    11

    Default Re: Classic IV build engine suggestions and WHY!

    Quote Originally Posted by avidflyer View Post
    Not John, but here is a video of Joey Myers flying on one of his trips between California and Idaho's Johnson Creek. His trusty 582 in an Avid Flyer. He has quite a few other vids if you look through his channel. Another guy who is on the AvidFoxFlyers Forum flew his 582 powered Avid from California to Conneticut. JImChuk
    https://www.youtube.com/watch?v=O5cqalZuONw tried the link after I posted it and it didn't work for me. look for Headed to McCall ILov2fly that's the name Joey goes by on utube.
    Ok nice videos he has. Im interested in both if I can find a decently low time 912 Ill do it but the 582 might work for me with the occasional trip out of PA. Mostly withing 100-200 miles of KHZL.

    Ed~

Posting Permissions

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