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Thread: C-85 stroker

  1. #1
    RaisedByWolves's Avatar
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    C-85 stroker

    Hey guys, I keep hearing people talking about a c-85 stroker, can you guys fill me in, what does it consist of?

    Also, what's the most bang for the buck if you will for a j-3?


    Thanks
    Tom
    Tom Ford

  2. #2
    behindpropellers's Avatar
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    Tom,

    Best bang for the buck is a good C-90 with a good crank. C-85 stroker is a C-85 with a C-90 crank and pistons.

    You can look for a complete C-90 or start collecting parts. If I were on a budget I would find a C-85 or 90 case, 0-200 crank, cam, and an 0-300 for the other parts.

    Tim
    Piper J-5A C-90 N40877
    J-5 Project Pictures

  3. #3
    fly_cubs's Avatar
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    I'd do a search on the site for the stroker- there's a fair amount of info on it.


    I have one on my J-3, and the fun factor with all that power in a light airplane is really hard to beat.
    Tim Farris
    Chapel Hill, NC
    1940 J3F-50 with C-85/O-200 Stoker

  4. #4
    RaisedByWolves's Avatar
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    Now can I use a c-75 case for anything of it?
    Tom Ford

  5. #5
    behindpropellers's Avatar
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    Quote Originally Posted by cessna_pilot View Post
    Now can I use a c-75 case for anything of it?
    C-75 case is good to build up a 90 or 85. 75 crank is the same as an 85.

    Just make sure it is a C series, not an A series. Lots of people write their cub has a C-65 when their cub has a continental A-65 (or A-75).
    Piper J-5A C-90 N40877
    J-5 Project Pictures

  6. #6
    RaisedByWolves's Avatar
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    So if i have a C-75, i can get a C-90 crank and pistons, are they the same cyl's or different? Also is it an stc for this mod? is that the "stroker" i am hearing about

    Thanks
    Tom
    Tom Ford

  7. #7
    Clay Hammond's Avatar
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    Call Don Sword, he will tell you everything you need to know. We have one on my dad's Cub and it is a hoot.

    http://www.donsdreammachines.com/sit...6/Default.aspx

  8. #8
    behindpropellers's Avatar
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    Quote Originally Posted by cessna_pilot View Post
    So if i have a C-75, i can get a C-90 crank and pistons, are they the same cyl's or different? Also is it an stc for this mod? is that the "stroker" i am hearing about

    Thanks
    Tom
    Study this document also:

    https://docs.google.com/open?id=1Fqk...GPGhuuRoYluz87
    Piper J-5A C-90 N40877
    J-5 Project Pictures

  9. #9
    Nathan K. Hammond's Avatar
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    Best bang is what you have, vs. what you can spend. C-90's are great, but tough to find without spending big $$$; O-200 are great because you can find them anywhere, but the cam doesn't make power as good. Super-85's combine the best of both; power of the C-90, and availability of the O-200.

    Fairly certain you have to use a C-85 case; my copy of the STC only mentions C-85's NOT the C-75. I'm sure it can be done, but to make it legal will require a 337/field approval. Same thing with using C-90 parts; they're not listed in the STC.

    The original STC had you use a C-85 core, with O-200 crank, rods and pistons. But, if you have a good O-200 core, you can combine a couple different STC's from Don Swords and use an O-200 case, crank, rods, pistons, gears, and cylinders with a C-85 cam and achieve the same thing. Basically an O-200 with an 85 cam. All done legally.

    If you're serious; best thing to do is call Don Swords with specific questions about what parts you have on hand. He can tell you what will work and what you need to finish.

    Good luck; it's a sweet-heart of a motor.

    nkh
    Last edited by Nathan K. Hammond; 05-08-2012 at 08:02 PM.

  10. #10
    cruiser's Avatar
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    Note that the C75 and C85 cams are the same. 0200 innards and your on your way. Afraid of that 125 Franklin? Jim

  11. #11
    cubdriver2's Avatar
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    I'm flying 2 different Strokers right now, one in a J3 and one in a J4 and they both run great,but my pa11 was a C90-8 that was really a -8 0200 because it had the 0200 cam and timming. C90 and 0200 share the same crank, rods, pistons and cylinders. I think if I did it all over I would just use a 0200 with the correct prop that lets it turn 2650+ on takeoff and in a 650 lb J3, J4 or a pa11 would be tough to beat off the ground at 5 gal an hour. The great thing about the C85 stroker is that it always stays a C85 even though it's 0200 parts and it makes the paper work very easy. If you want to save more pounds DDM can make a 0200 case into a -8

    Glenn
    Last edited by cubdriver2; 05-08-2012 at 01:46 PM.

  12. #12
    RaisedByWolves's Avatar
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    Quote Originally Posted by cruiser View Post
    Note that the C75 and C85 cams are the same. 0200 innards and your on your way. Afraid of that 125 Franklin? Jim
    I'm not, but my father wants to stay certified. That champ will make a nice plane for someone

    Tom
    Tom Ford

  13. #13
    RaisedByWolves's Avatar
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    So with dons STC, all i would need is O-200 crank con rods and pistons? All else stays the same?

    Tom
    Tom Ford

  14. #14
    Nathan K. Hammond's Avatar
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    yep, that's it.

    nkh

  15. #15
    RaisedByWolves's Avatar
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    Cylinders stay the same as on -75 right?

    Thanks For your help guys, i never seem to have any luck with the search feature

    Tom
    Tom Ford

  16. #16
    cubdriver2's Avatar
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    Quote Originally Posted by cessna_pilot View Post
    Cylinders stay the same as on -75 right?

    Thanks For your help guys, i never seem to have any luck with the search feature

    Tom
    Tom I just talked to Don, as long as it's a " C75 " it's doable, not a A75, C75 needs to be changed to a C85 which he said is easy and the main jet and venturi need to be changed. You should call him and he will tell you what you need to do 770 412 8885. The big problem right now is the shortage ( none ) of 0200 cranks

    Glenn
    Last edited by cubdriver2; 05-08-2012 at 03:48 PM.

  17. #17
    Nathan K. Hammond's Avatar
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    C-75 through O-300 cylinders are all the same. There are different valve springs for different applications, but the physical cylinders are all the same.

    nkh

  18. #18
    behindpropellers's Avatar
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    There is continental documentation on going from a c-75 to c-85, FYI.

    The interchange manual is also a continental document, FYI.
    Piper J-5A C-90 N40877
    J-5 Project Pictures

  19. #19

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    Here's a website about "what fits what" & "convert this to that" for the 4 banger Continentals. Pretty interesting reading.
    www.bowersflybaby.com/tech/fenton.htm

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