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Thread: Oil On My Belly

  1. #1

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    Oil On My Belly

    Experimental J3, Rolls Royce Engine, for a mental picture, the engine is very similar to a Continental C90. Oil from the breather tube, not a lot but a bit and considering a crank case vacuum and oil separator from Anti Splat Aero.

    https://antisplataero.com/products/t...-oil-separator

    and

    https://antisplataero.com/products/c...m-kit-complete

    Does anybody have any experience with these or am I just adding more weight and complexity?

    Opinions?

    Zach

  2. #2
    SJ's Avatar
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    My experience is they are not worth the metal they are made with, but others may disagree...

    sj
    "Often Mistaken, but Never in Doubt"
    ------------------------------------------
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  3. #3

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    I would try and find the issue of the excessive blow by first, not sure with the C90’s but there is a modification to the breather line elbow on the crank case, it consists of brazing a three inch long tube with a slight angle cut. Seems to help on the other small Continentals from throwing oil out the breather, even with good piston rings.
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  4. #4
    cubdriver2's Avatar
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    Quote Originally Posted by Sikorsky View Post
    Experimental J3, Rolls Royce Engine, for a mental picture, the engine is very similar to a Continental C90. Oil from the breather tube, not a lot but a bit and considering a crank case vacuum and oil separator from Anti Splat Aero.

    https://antisplataero.com/products/t...-oil-separator

    and

    https://antisplataero.com/products/c...m-kit-complete

    Does anybody have any experience with these or am I just adding more weight and complexity?

    Opinions?

    Zach
    What oil level are you running

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"
    Likes DENNY liked this post

  5. #5

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    I’m having trouble picturing the 3” long tube with an angle cut. Actually I can picture it but don’t know how shortening the tube will help. I have a 2-3 foot line going to the vent and then venting out the bottom of the cowl. The build was extensive with new everything with proper brake in procedures in 50-60 degree weather.
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  6. #6

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    I have a 6 qt kidney tank and have run 6, 5, and 4.5 for a beta test.

  7. #7
    cubdriver2's Avatar
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    Quote Originally Posted by Sikorsky View Post
    I have a 6 qt kidney tank and have run 6, 5, and 4.5 for a beta test.
    I never run more than 3.25 qts, add when it gets to 2.5. Try 3 qts and see if it stops.
    Also, don't trust marks on stick, add a qt at a time and check against stick marks

    Glenn
    Last edited by cubdriver2; 09-23-2022 at 06:59 PM.
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"
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  8. #8

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    You probably want that ugly oil/water mix to go overboard and cause global warming. Having cleaned a few of those tubes, I don't want any part of that back inside my engine. Looks like σκατα.
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  9. #9

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    I built a wood fire in the house today, warming is happening! I probably shouldn’t worry about the small breather tube issue as the smoke system will be going on soon and the belly will soon be BATHED in oil, but I like making stuff more difficult than it has to be.

    I wonder if there is a correlation between high compression continentals and breather tube oil issues.

  10. #10

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    Quote Originally Posted by Sikorsky View Post
    I’m having trouble picturing the 3” long tube with an angle cut. Actually I can picture it but don’t know how shortening the tube will help. I have a 2-3 foot line going to the vent and then venting out the bottom of the cowl. The build was extensive with new everything with proper brake in procedures in 50-60 degree weather.
    Click image for larger version. 

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  11. #11
    cubdrvr's Avatar
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    I'm wondering.........how much case pressure in small engines? Depend on blow-by? I'm assuming that case pressure is not necessary and robs horsepower. Would a larger case vent decrease pressure and therefore reduce the vent pressure.......say a 1" or greater case vent vs. the 3/8-1/2" ?
    "Sometimes a Cigar is just a Cigar"

  12. #12
    stewartb's Avatar
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    I have the crankcase vacuum and oil separator on my IO-390. It works great. There was a thread this spring where I tested crankcase pressure using the vacuum and without. It works as advertised. I’ve never had a drip of oil from the Cub on the hangar floor.

  13. #13

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    Oh… now THERE is a damn good idea. I know for a fact my vent doesn’t have that little beauty on in. And venting it over the top is also a a good idea. Maybe not for winter ops but summer I don’t see an issue with that freezing and plugging up.

    Bet that 3 inch tube will fix the problem 100%.

  14. #14
    stewartb's Avatar
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  16. #16
    cubdriver2's Avatar
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    Little Continentals don't like more than 3 qts or they blow it out

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"
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  17. #17

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    ike they have said above the extension and over the top really helps. and as Glenn said the matings on some of the sticks are way off. I like 4 qts have more issues with leaks than blown out oil.

  18. #18
    RaisedByWolves's Avatar
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    I have an 85 that i recently put new cyl and broke in, had been fine for 50 hrs, not using much, but put the long breather elbow and its blowing a qt out every 2 hr. 3 qts max in the sump. Compression didnt show any low cyl. Not sure what changed. Just swapped the elbow back and going to see. put a baby bottle on the end of the breather to see how much its pushing out
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  19. #19
    skywagon8a's Avatar
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    Quote Originally Posted by RaisedByWolves View Post
    I have an 85 that i recently put new cyl and broke in, had been fine for 50 hrs, not using much, but put the long breather elbow and its blowing a qt out every 2 hr. 3 qts max in the sump. Compression didnt show any low cyl. Not sure what changed. Just swapped the elbow back and going to see. put a baby bottle on the end of the breather to see how much its pushing out
    Where is the oil coming out? The breather? The exhaust? A compression test will not show a bad oil control ring.
    N1PA

  20. #20
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    Oil On My Belly

    Yes breather into the baby bottle, guess I’m too used to working on lycomings


    Sent from my iPhone using Tapatalk

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