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  • What is this sitting inside my air cleaner housing???
  • What is this sitting inside my air cleaner housing???
  • What is this sitting inside my air cleaner housing???
  • What is this sitting inside my air cleaner housing???

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  1. #1
    Member FactoryC3's Avatar
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    Default What is this sitting inside my air cleaner housing???

    I noted this just after getting my '81 and cannot figure it out. Is it a flame supressor?? Or what?
    Attachment 20447

  2. #2
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    It's a di-inverse flowing confabulator valve?

    Ah...no.

    Not sure what the heck it is, actually. I'm thinking it's some kind of flow straightener but that's nothing more than a WAG.

    Merry Christmas
    Hib Halverson

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    Whoosh, and blur

  4. #4
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    Quote Originally Posted by kpic View Post
    Thanks much...
    How do you clean it...if you do?

  5. #5
    Moderator bill81vette's Avatar
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    Quote Originally Posted by kpic View Post
    I have never seen one of those....
    Bill and Gail...save the wave
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  6. #6
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    Quote Originally Posted by FactoryC3 View Post
    Thanks much...
    How do you clean it...if you do?


    If it is metal screening you could use a solvent, brake cleaner, or carb cleaner. If it is fabric mild soap and water. If it is paper then all you can do is blow air through it, but it will still be restrictive as you will not clean it thoroughly, paper is meant to be thrown away when dirty.

    Here is a better idea though - remove it and install a quality air filter. If it were me I would follow the sticker on your air cleaner assembly. Good luck with it.
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  7. #7
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    FWIR, the inner one is filled with charcoal.

    Most owners pitch them for a K&N; however, I would not throw it away as most 81s are missing it.
    Whoosh, and blur

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    Member LLC5's Avatar
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    Quote Originally Posted by kpic View Post
    FWIR, the inner one is filled with charcoal.

    Most owners pitch them for a K&N; however, I would not throw it away as most 81s are missing it.


    Are you saying that the inner filter, that is attached with blue sealant in the picture, is factory installed?
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  9. #9
    Member Vettehead Mikey's Avatar
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    Quote Originally Posted by FactoryC3 View Post
    Thanks much...
    How do you clean it...if you do?
    If it's inside the main filter why would it be dirty?

  10. #10
    Member LLC5's Avatar
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    Quote Originally Posted by Vettehead Mikey View Post
    If it's inside the main filter why would it be dirty?


    Depending on it's composition, fuel vapors and blow by especially if it has charcoal in it, if it is just a screen then it is probably not plugged and is serviceable. If it is a charcoal composition then it is not serviceable, and it may be a form of evaporative emissions filter (possibly for CARB only) installed by GM.
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  11. #11
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    Quote Originally Posted by LLC5 View Post
    Are you saying that the inner filter, that is attached with blue sealant in the picture, is factory installed?
    LLC5
    As I've never seen one, read or heard of one until Factory C3 posted which made me curious. So after a fruitless search through my library; I started searching. All I found was a couple of posts at a few different forums.

    The inner filter was factory installed and one year only, 1981. The most viable claim was it's purpose was some kind of emissions component. Other reasons were backfire baffles, flow straighteners etc. Having owned a boat with a V8 the flame arrestor was nonsense and straightening flow before a 90 turn would lack any sense.

    As most original owners pitched them for an aftermarket filter; they are only found on original low mileage 1981 Corvettes. Due to its function, the low mileage makes sense.
    Some owners claim starting problems vanished when they replaced both filters with a K&N. After a decades of use, that makes sense also. All owners claim more power after replacing them. Amazing, how some claim to be able to feel a couple of WHP.

    As the above came from the internet and we all know the internet. If anyone owns a 1981 Corvette Service Manual, I'd be interested in learning what it documents.
    Whoosh, and blur

  12. #12
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    I'm even more convinced it's a di-inverse flow confabulator.



  13. #13
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    Quote Originally Posted by kpic View Post
    Some owners claim starting problems vanished when they replaced both filters with a K&N. After a decades of use, that makes sense also. All owners claim more power after replacing them. Amazing, how some claim to be able to feel a couple of WHP.

    As the above came from the internet and we all know the internet. If anyone owns a 1981 Corvette Service Manual, I'd be interested in learning what it documents.
    Some people also believe getting rid of the computer controls gives the car more power, but we all know some people never have their buttometer calibrated.

    there's no mention of this filter in the service manual. It never refers to filters, only the filter or element.

  14. #14
    Member LLC5's Avatar
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    Quote Originally Posted by kpic View Post
    LLC5
    As I've never seen one, read or heard of one until Factory C3 posted which made me curious. So after a fruitless search through my library; I started searching. All I found was a couple of posts at a few different forums.

    The inner filter was factory installed and one year only, 1981. The most viable claim was it's purpose was some kind of emissions component. Other reasons were backfire baffles, flow straighteners etc. Having owned a boat with a V8 the flame arrestor was nonsense and straightening flow before a 90 turn would lack any sense.

    As most original owners pitched them for an aftermarket filter; they are only found on original low mileage 1981 Corvettes. Due to its function, the low mileage makes sense.
    Some owners claim starting problems vanished when they replaced both filters with a K&N. After a decades of use, that makes sense also. All owners claim more power after replacing them. Amazing, how some claim to be able to feel a couple of WHP.

    As the above came from the internet and we all know the internet. If anyone owns a 1981 Corvette Service Manual, I'd be interested in learning what it documents.


    If it was factory installed (the more I look at the picture, the more it does look factory installed even with the blue sealant) then it probably is an evaporative emissions device required by CARB.
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  15. #15
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    Quote Originally Posted by LLC5 View Post
    If it was factory installed (the more I look at the picture, the more it does look factory installed even with the blue sealant) then it probably is an evaporative emissions device required by CARB.
    Just for the looking and info, here is a link for a new assembly...78 79 80 80 81 Corvette GM Air Cleaner Assembly PT 25040289 | eBay

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