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Thread: Plz help, need 0290 piston rings

  1. #1

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    Plz help, need 0290 piston rings

    Going through the 0290 in my Super Cub and need some piston rings. Any help or suggestions on where they could be found would be greatly appreciated. I need 4 of each 49401 and 62916 P020. (Both 20 over)

    Thanks,

    Tim

  2. #2
    sjohnson's Avatar
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    I looked at the cost of overhauling an O-290 and decided to switch to an O-320.
    The modern equivalent of the phrase "lions led by donkeys" is "innovation led by lawyers".

  3. #3
    Farmboy's Avatar
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    Steve introduced me to Sal’s Aircraft Cylinders.
    Call Sal or Jere at (972) 346-3339


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  4. #4
    Marty57's Avatar
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    Quote Originally Posted by IowaJ3 View Post
    Going through the 0290 in my Super Cub and need some piston rings. Any help or suggestions on where they could be found would be greatly appreciated. I need 4 of each 49401 and 62916 P020. (Both 20 over)

    Thanks,

    Tim
    Did you figure this out yet? I have two complete 0290-D2's for my project. Last year, I stopped by Ly-Con Aircraft Engines in Visalia, CA (559 651-1070) for an old case to use as a jigg. I asked about overhauling an 0290. They told me it's not an issue for them as they have parts and cost was not much different than an 0320. They also had a few dozen new, crated 0290's from Greece on their shelves. Give them a call and see if they might have rings to sell.

    Marty57
    N367PS
    Psalm 36:7 "High and low among men find refuge in the shadow of His wing"
    www.marty2plus2.com
    Thanks 1934A thanked for this post
    Likes 1934A, Charlie Longley liked this post

  5. #5
    supercub's Avatar
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    Did you try Fresno Airparts?

  6. #6
    Charlie Longley's Avatar
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    My first two PA-12’s had O290-D2 engines. Really great engine! Didn’t notice a big difference when I bought one with an O320.

  7. #7
    TurboBeaver's Avatar
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    Manager at El Reno Aviation told me that they got $ 400 a hole for new standard piston and rings ( last of lycomings old stock) around 5 years ago! Said phone rings all day with folks wanting to buy 0290
    Stuff........most clyinders have been overhauled dozen of times by now.......
    Lots of price gouging going on out there on anything 0290 , simple cure was to cut out clyinder openings .250 so case will accept
    0320 clyinders! Gets rid of ALL the headaches of the 0290. (Experimental)
    Wishing you the best of luck
    E

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  9. #9

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    Is this for the D or D2 engine?

  10. #10

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    I have a 0-290d with 287 hrs total time I would sell you the cylinders pistons and rings for a fair deal, let me know

  11. #11

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    Now the big question for me is will you be able to bore a 290 case to accept 320 jugs? Maybe that would be a good STC to persue?

  12. #12

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    I dont think there is an STC, experimental build only.

  13. #13
    TurboBeaver's Avatar
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    There are lots of 0290's around with 0320 clyinders on them, but there is NO stc and likely never will be........ The airboaters in FL started this about 30 years ago, as 0290 parts started to get scarce; it's a simple mod and " Outlaw
    Engines" down there is jiged up to bore them out and a few years back it was $500. If you run standard 0320 piston you won't see any increase in hp even though you have increased your CI by 30; as you going down on compression ratio........ The standard 135 piston in a 0290
    would be like running 160hp pistons in a 0320.
    But it does open up a whole world of proven options!
    If your certified you are painted into a corner, your ONLY
    choice is run overhauled CHROME clyinders ( most have
    been done many times already) so it's common to have the heads crack with very low hours after they come back
    With yellow tags on them................. And then face the music on what someone will dare to ask for a good used piston........ Or a 70 year old set of rings......
    Wishing you the very best of luck with your
    project!
    E

  14. #14

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    I always thought that an O290 bored out to accept O320 cylinders would be an honest 150hp engine...bore and stroke are the same as an actual O320.... Why would you have less compression?

  15. #15
    TurboBeaver's Avatar
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    Well because the 0290D2, ( which can be rated at 135/140hp) according to which pistons it had: Are of
    a higher compression "ratio",(7.5/8 to 1) than the "standard pistons" (7/1)
    that are in an 0320......
    I have seen this reference more than once over the years, the
    "0290D2 was the highest horsepower per weight ratio" that Lycoming ever built . You may also need to consider the cam lobe on both engines??? Of course all
    this is pointless if 'your aircraft is certified'?
    IF you wind up with a set of 0290 clyinders to overhaul:
    Possibly the best way to handle that is to have them converted over
    to new 1/2" valves to get away from all the valve issues the 0290 7/16 valves have...... That involves reboring the guide holes for 0320 guides and recutting the Allison seats holes to accept the larger seats , because if the simply recut the 0290 seats to accept the larger valves, there is hardly anything left......... Divco can do all this stuff
    However the clyinders will come with 'white tags' not yellow tags. So that's another story.
    Best wishes,
    E
    Last edited by TurboBeaver; 04-03-2021 at 02:01 AM.

  16. #16

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    But if you run standard O320 pistons at 7:1, wouldnt that make 150hp since bore and stroke are the same as an actual O320?
    I'm just curious because i recently had an O290D overhauled. I considered boring it for O320 cylinders, but ended up finding a set of O290D2 cylinders that i ended up using.

  17. #17
    TurboBeaver's Avatar
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    Not sure of the cam lobe angle weather it would have correct endurance to develop correct HP, of course you would need to ditch your -3 Carburetor and up grade to like a -4 probably a 3678-32 that will flow like 15 gph at full throttle. And then of course the proper propeller to get
    the rated RPM to develop the 150hp. Lots of hitches on that trail besides just bolting on the clyinders. I used to run 0290D2 with Divco clyinders with 1/2" valves, HC pistons, into a tuned exhaust, using a -4 Carburetor that would swing a 82/42 Borer 2450 static. So they will work nice when they are running right. But your still running clyinders with prehistoric aluminum heads with God knows how much total time on them??? The 0320 clyinders eliminated all
    that crap and gets you into unlimited supply of parts. The oil control ring on the 0320 is a huge upgrade over the 1930's design of the 0290 that was of course first designed to power a generator! Not an airplane. Lol.
    Good Luck with your project
    E
    Last edited by TurboBeaver; 04-03-2021 at 05:50 PM.
    Thanks 1934A thanked for this post

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