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I have been looking at the Tempest AA1000 Engine Preservation System sold by Aircraft Spruce.

Put simply, it is a unit that draws in ambient air through a silica gel pouch and introduces the dry air into the engine crankcase via the oil filler tube. On it's way out, the air is able to pick up condensation/water within the engine and effectively remove the water that causes the rust.

My question is this :-

If I were to make such a unit for the Rotax 912UL, where could I introduce the air into the engine so that it circulates within. Any thoughts ??

The two cone air filters have home made silica gel bags encased around them during longer periods of lay up.

Thank you sir for your kind attention.

Sincerely.

HR


e made two
  • Re: Lay up in humid conditions

    by » 7 years ago


    What is the rate of air being drawn through the engine? if it is very low you could just remove or loosen the spark plugs.
    If it is drawing more than that then you could remove the unused oil return plug at the bottom of the crankcase.

  • Re: Lay up in humid conditions

    by » 7 years ago


    Just spent 1 hour replying to Mr Seaton's reply to my question and instead of sending it, was tempted to send it to the editor. Upon finding this page, decided to return back to the written page and found that my text had disappeared.

    Can you recover it ?

    In total anguish.

    HR

  • Re: Lay up in humid conditions

    by » 7 years ago


    Sorry Hann, but the "Quick Reply" data is cached in your web browser, not in our system. So we are not able to recover it.

    There is a general rule of thumb on web forums going back decades - "type long posts into notepad, then paste into forum post when done". I still have the long-standing habit of clicking in the text box and going 'Ctrl-A, Ctrl-C" before posting anything! That advice is supposed to be obsolete in our modern age, but due to many factors, things on the web don't always work as advertised.

    And sadly, you have just uncovered a bug in our forum software.
    Regardless of the post length or time spent writing, the 'Go To editor' link is BROKEN now. I'm not sure which recent update to Linux OS, httpd server, PHP language, our web platform, sub-assembly of the web-platform, or the actual 'forum software' running on top of it all has broken it, but it's definitely broken now :(

    I've put a request in to the developer of the forum software, but they are on the other side of the planet, so I likely will not get a reply until tomorrow. Half the time these developers point the finger at something else downstream, and that takes more time to sort out (The "web" is truly a tangled web). Our software has no built in way to hide the "Quick reply" panel so I advise everyone to use the "Action | Reply" (dropdown) instead, if they think they might want the editor functions in a post reply. I'm going to look right now if I can manually hack some of our template scaffolding to hide the 'go to editor' link until I get a fix back for this issue... Sorry for the inconvenience!

  • Re: Lay up in humid conditions

    by » 7 years ago


    OK, I have managed to come up with a workaround for the time being - I just removed the link that used to point to the (currently broken) 'go to editor...' function. Someday when the developers get their heads wrapped around it, we will be able to add back that function. But for now, if you want to reply to a message and have the "full message editor", use the "Action" dropdown and use the "reply" or "quote" option.

  • Re: Lay up in humid conditions

    by » 7 years ago


    The classical method of blowing in the Oil Filler tube and out the crankcase ventilation hose is not going to work.
    The 912 series of engines are a different animal. They do not have an Oil Pan, PCV Hose or Filler tube.

    The 912 engines have a sealed, pressurized, oil scavaging, crankcase.
    In normal operation, the blow-by of the piston rings pressurizes the crankcase.
    This pressure forces any oil in the bottom of the crankcase out the oil return hose at the Bottom of the crankcase to an external Oil Tank.
    The oil drops to the bottom of the Oil Tank to be returned to the engine as the Crankcase Gasses are vented out the top of the oil tank.

    It would be possible to vent the crankcase, as Rob suggested, by blowing air in one of the unused Oil Return Plugs in the bottom of the crankcase.
    This would require an air pump that could produce at lease 1-2 PSI and a few Liters or so of air per minute.
    The pressure will be needed to initially purge the oil line back to the oil tank and the flow rate will need to overcome any leakage through any piston ring that has an open valve above it.
    A plus of this method would be that any open combustion chamber is going to be ventilated out the exhaust pipes.

    The air requirements could be satisfied by any medium sized air pump normally used for aquariums.
    They can typically pump past 2-3 feet of water-column and oil is lighter than water. Good for us.
    1 liter per minute (2 cu.ft./hr) can easily be achieved by the smallest of pumps and they are designed for continuous service.

    The attachment to the crankcase could be obtained by using any of the small locking ball valves sold for use in simplifying engine oil changes.
    Do a search for "Oil Change Valve". Lots of choices. "Fumoto" is the design standard.
    Be sure to get one that matches the threads on your crankcase and select the style that includes the Nipple for attaching external hoses.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.


    Thank you said by: Capt. Siva,

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