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  1. Thread: Lycon pistons

    by JimC
    Replies
    16
    Views
    5,294

    In the spirit of full disclosure, I got a pm...

    In the spirit of full disclosure, I got a pm today from a mechanic that I admire, telling me that this particular engine has a history of problems caused by the high compression pistons. I've owned...
  2. Thread: Climb prop C-90

    by JimC
    Replies
    63
    Views
    18,529

    "The 37" pitch doesn't have a longer takeoff roll...

    "The 37" pitch doesn't have a longer takeoff roll but will probably hit around 2750 rpm at WOT straight and level"

    With an O-200 at WOT in level flight, I like to be capable of hitting 3000 rpm. ...
  3. Thread: Lycon pistons

    by JimC
    Replies
    16
    Views
    5,294

    Intake elbow gasket on one cylinder missed the...

    Intake elbow gasket on one cylinder missed the stud on one side. Caused it to run rough. Just needed that gasket replaced. Nothing wrong with the engine.
  4. Thread: Lycon pistons

    by JimC
    Replies
    16
    Views
    5,294

    Insurance. Lot's of folks fly in that plane, and...

    Insurance. Lot's of folks fly in that plane, and the engine wasn't stock due to 9.5 pistons.
  5. Thread: Lycon pistons

    by JimC
    Replies
    16
    Views
    5,294

    It was in Rick's J3. We pulled it and installed...

    It was in Rick's J3. We pulled it and installed a stock O-200 a couple of years ago.. Fuel burn went up from 4.3 to 4.7 gph when we went stock.
  6. Thread: Lycon pistons

    by JimC
    Replies
    16
    Views
    5,294

    I've got several hundred hours on 9.5 Lycon...

    I've got several hundred hours on 9.5 Lycon pistons in an O-200-A bored 0.015" oversize. No problems with them on mogas. Were I to do it again, I would go 10.0:1.
  7. Replies
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    23,694

    The C150 exhaust would have been for my 11, not...

    The C150 exhaust would have been for my 11, not the 3.

    Mixture distribution seems OK - no signs of temperature distress, runs very smooth. J3 is non-electric, so don't have good figures on...
  8. Replies
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    23,694

    No noticable blowback through the guides. Valves...

    No noticable blowback through the guides. Valves and seats look and seal good (I run 93 octane mogas with ethanol). Carb is an MA3-SPA 10-4115 with brass float. 9.5 cooling is not an issue on a J3...
  9. Replies
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    23,694

    I pull a cylinder and look at the pistons ever...

    I pull a cylinder and look at the pistons ever hundred hours or so. I suspect the 9.5 O-200 would tolerate 28/30, but haven't actually tried it. Wanted to build up a few hundred hours at 28 first....
  10. Replies
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    23,694

    "Magneto timing to the upper range of acceptable...

    "Magneto timing to the upper range of acceptable tolerance is important".

    True. In one O-200, I run 28 BTDC with the 9.5 pistons and the 35 overlap O-200 cam. Am thinking about advancing a...
  11. Replies
    79
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    23,694

    Main advantage to the C150 exhaust is that I have...

    Main advantage to the C150 exhaust is that I have one lying around.
    Are you running the 788 cam in the Stroker?
    Or the 24 cam?
  12. Replies
    79
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    23,694

    I don't like the brackett either (except in very,...

    I don't like the brackett either (except in very, very dusty conditions).

    I typically see about a 25-30 rpm static difference between the Brackett and no filter.

    I'm thinking about a C150...
  13. Replies
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    23,694

    I agree wholeheartedly about the every bit part....

    I agree wholeheartedly about the every bit part.
    So, the chart and text in the link was wrong?
    (it doesn't jive with your numbers - it gives a half inch of water difference for 130 cfm, and you are...
  14. Replies
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    23,694

    So, with a volumetric efficiency of about 0.8, at...

    So, with a volumetric efficiency of about 0.8, at 2800 rpm the 90 and O-200 will pump about 130 cfm. That gives an improvement of 0.4 inch of H2O over the Brackett, for about a tenth of a percent...
  15. Replies
    79
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    23,694

    "Most engines benefit from breathing easier" I...

    "Most engines benefit from breathing easier"

    I would agree with that, and the 90's 24 cam would also benefit from that as well. As would the 35 cam of the O-200. Continental did not dyno these...
  16. Replies
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    7,076

    There are a number of different slat designs...

    There are a number of different slat designs (though none for stock Cubs). Which one do you want?
    Need more information.
  17. Replies
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    23,694

    As an aside, the stock O-200 cam gives more power...

    As an aside, the stock O-200 cam gives more power and torque than either of the C90 cams up to a density altitude of about 9400-10,000 feet. At sea level, according to Continental, anytime the O-200...
  18. Replies
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    23,694

    A65 spider has an external and internal stepdown...

    A65 spider has an external and internal stepdown in the throat that the 85/90/O-200 spider doesn't have. Opening the 65 spider up for 'improved' flow will cause it to crack at the stepdown due to...
  19. Replies
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    7,076

    Of a slat? Or of a flap?

    Of a slat?
    Or of a flap?
  20. Replies
    27
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    7,076

    Are you wanting dimensions for slats (which...

    Are you wanting dimensions for slats (which vary), or for flaps?
  21. Replies
    79
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    23,694

    Quoted -- "Normal compression is about 6-1 with...

    Quoted -- "Normal compression is about 6-1 with O200 pistons, running C85's takes it to about 7/7.5-1?....sorry I don't know the exact number".

    Normal compression for C90/O-200 is 7.00:1
    C85...
  22. Replies
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    13,841

    Just saw this old post. Rocker ratio is 1.2

    Just saw this old post. Rocker ratio is 1.2
  23. Replies
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    23,254

    "Don't you hate that no free lunch crap? Who...

    "Don't you hate that no free lunch crap? Who thought of that one anyway?"

    Jerry Pournelle's grandfather. Robert Heinlein made it famous. TANSTAAFL
  24. Thread: What do I have

    by JimC
    Replies
    19
    Views
    2,895

    Pull one sparkplug. Round off one end of a...

    Pull one sparkplug.
    Round off one end of a welding rod so you won't scratch anything.
    Stick the rod in the spark plug hole and measure minimum and maximum welding rod displacement to determine...
  25. Replies
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    6,531

    Got any photos of the latch mechanism?

    Got any photos of the latch mechanism?
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