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I have a 914 with a big bore kit and an intercooler.  I am having problems with excessive blow-by in the oil bypass that leaves a mess of oil all over the tail of the aircraft every time I fly.  

Looking at the output line there is always foamy oil present after we fly.

I have a 915 oil can with dual return lines to the can from the engine and oversized oil lines in place to allow more volume and reduce the foaming at the tank..

I run sport 4 and change the oil every 50 hours burning 100 LL as there is no ethanol free gas available where I am at.

Oil pressures are consistent in the 45 to 50 PSI range.

Has anyone tried the anti-foaming oil additives to see if it helps?  Will they hurt the engine?

Thanks in advance for the comments and input.

  • Re: Oil Foaming

    by » 10 months ago


    The screen inside the oil tank is supposed to reduce foaming. Are you sure it is properly installed and not being bypassed; are your IN and OUT lines swapped by any chance. An air leak on the suction side of the oil pump could also cause the problem.


  • Re: Oil Foaming

    by » 10 months ago


    Everything is installed correctly and we have not been able to detect any issues around air in the system.

     

    Thanks for the suggestion. 


  • Re: Oil Foaming

    by » 10 months ago


    You mention that there is no E0 unleaded fuel available out by you, but this seems to suggest otherwise:

    https://www.pure-gas.org/index.jsp?stateprov=SD


  • Re: Oil Foaming

    by » 10 months ago


    Tyler Hathaway wrote:

    You mention that there is no E0 unleaded fuel available out by you, but this seems to suggest otherwise:

    https://www.pure-gas.org/index.jsp?stateprov=SD

    My profile says SD but I am currently flying a police gyroplane in Modesto California so no ethanol free stuff in this commie state. 


  • Re: Oil Foaming

    by » 10 months ago


    What is the oil level in the tank? If the oil level is higher than it likes the excess is blowing out the vent line. I know on my 914 and 912 uls they like to be at the lower end of the dipstick.


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