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Technical AC on-o-mizer filter

Discussion in 'The Hokey Ass Message Board' started by anthony myrick, Feb 19, 2021.

  1. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    Found this on a 235 I loaded up today.
    FE8C8466-1A64-432A-B5A7-66A1067A4830.jpeg
    this was new for me. Seen the glass bowl filters but not the extra vacuum port.
    curiosity lead me to this
    on-o-mizer.jpg
    this particular 235 came from a fleet vehicle, bet the bosses made em use these "fuel economy" tricks
    wonder if it worked or was a gimmick?
     
  2. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,775

    Ebbsspeed
    ALLIANCE MEMBER

    Aren't those just the "in" and "out" ports? Dual carb use maybe? There's one on eBay just like it, with the two lower ports.
     
  3. David Gersic
    Joined: Feb 15, 2015
    Posts: 2,499

    David Gersic
    Member
    from DeKalb, IL

    It looks like a Barnum product, designed to separate suckers from their money. I’m sure it worked well for its intended purpose.


    Sent from my iPad using The H.A.M.B. mobile app
     
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  4. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    The little info I found was a fuel economy gadget.
    It came off a single carb fleet vehicle. I’m guessing a gadget sold to fleet guys.
    I’m still processing how it worked. The vacuum port goes to manifold vacuum.
    It does have an un-machined/threaded location that could possibly be used as an extra feed. Maybe
     

  5. I know nothing about it but find it humors that way back when Gas was .25 cents a gallon we were still trying to get more miles out of a Gallon.
     
  6. Mr48chev
    Joined: Dec 28, 2007
    Posts: 30,844

    Mr48chev
    ALLIANCE MEMBER

    One of those trinkets sold in the back of car magazines to "improve your fuel economy". My auto shop teacher told about a gent who was a regular patron of the shop classes for a number of years who was always buying every one of those increase your gas mileage trinkets and stick them on his car until the car just flat didn't run right then he would take it in for the guys to tune up and sort out. They would take all of his latest batch of gadgets off and stick them in a box in the store room and every couple of years give the latest box full back to him. He never learned that they didn't do anything except take his money. He either wasn't driving anymore or had left the area when I was a student as I never saw him or his car.
     
  7. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    This gadget is AC Delco
     
  8. squirrel
    Joined: Sep 23, 2004
    Posts: 50,927

    squirrel
    Member

    take it apart, show us what's inside
     
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  9. I wouldn't bet on that. o_O

    Well, maybe with your money, but not my own.
    :rolleyes:
     
  10. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    253B506C-F770-463B-BCFB-06BF2292A018.jpeg
     
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  11. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    image.jpg image.jpg image.jpg
    the diaphragm in the base seems to be stuck so I left it in as not to kill it.
    Seems since it uses manifold vacuum and has springs pushing downward on the diaphragms that it would be wide open at idle and low load situations and close under load restricting fuel?
     
  12. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    A1E543CD-A87E-4891-A233-869AEFB5A2DC.jpeg
    Got the other diaphragm loose. The diaphragms/springs opens and closes this valve that controls the outlet.
    So I’m assuming it restricts fuel at low vacuum
    image.jpg
     
    Last edited: Feb 19, 2021
  13. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,775

    Ebbsspeed
    ALLIANCE MEMBER

    Maybe it uses changing engine vacuum to operate that diaphragm and act as a fuel pump. That would take some of the load off of the fuel pump, reducing the friction at the interface between the fuel pump lever and cam lobe, thereby increasing fuel economy by 1/10th of an inch per hundred miles.

    It would reduce engine wear, increase fuel economy, make your engine run smoother, extend the interval between oil changes, make bald men grow haystack sized mounds of hair, and impotent men would regain their virility and be able to impregnate entire women's college rowing teams.
     
  14. Almostdone
    Joined: Dec 19, 2019
    Posts: 704

    Almostdone
    ALLIANCE MEMBER

    So like a 2 x 4 under the gas pedal then?
     
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  15. osut362
    Joined: May 15, 2013
    Posts: 32

    osut362
    Member
    from East Texas
    1. Upholstery

    My guess it's a governor . restricts fuel at high vacuum.....maybe
     
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  16. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    That’s what I’m going with.
     
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  17. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    I might have it backwards.
    High vacuum at no load should cause the diaphragms to compress closing the fuel inlet valve. You cant completely shut off fuel flow it seams.
    Then a low vacuum situation would open it up
    This engine was pulled from a Mail Service van. Probably idled a lot. GM probably made millions by saving the government a penny.
    my head hurts.
     
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  18. squirrel
    Joined: Sep 23, 2004
    Posts: 50,927

    squirrel
    Member

    definitely worth every penny!
     
  19. Paul
    Joined: Aug 29, 2002
    Posts: 15,751

    Paul
    Editor

    Pretty much essential for blow through supercharger setups, fuel pressure increases as boost signal increases, without something like this you will run rich at low boost or lean at higher boost.

    fuel pressure regulator.jpg
     
    Last edited: Feb 19, 2021
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  20. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    Dang it. This engine is missing its supercharger.
    I bet that unfinished extra port could have been cast there for a gauge if manufactured for the set up you posted.
     
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  21. Well I'll be dipped. o_O I mean that thing looks to have all the makings of some kind of a Whiz-bang, J. C. Whitney Miracle Power and Fuel Mileage Improver. :rolleyes: You're probably wishing that I'd invested more of your money on that bet. :p
     
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  22. blue 49
    Joined: Dec 24, 2006
    Posts: 1,530

    blue 49
    Member
    from Iowa

    There used to be a Cagle fuel pressure regulator that worked with vacuum. I think the idea was to lower the fuel pressure at high vacuum and thus the fuel level in the bowl, so there would be less head pressure to the light throttle carb circuits. I tried one and didn't see a difference.

    Gary
     
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  23. jimmy six
    Joined: Mar 21, 2006
    Posts: 10,996

    jimmy six
    ALLIANCE MEMBER

    I remember when Gary Cagle, Rest In Peace my old friend, sold fuel pressure regulators that were to help fuel mileage by setting it at very low pressure 1 to 1-1/2 and driving your car with mileage in mind they worked.
    If these lower the pressure allowed into the carb when the vacuum was high they could work also. A person driving with mileage in mind can achieve better mileage with less fuel pressure. Many Mobil Gas Economy Run cars used this as one of there many many tricks.
     
    Last edited: Feb 19, 2021
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  24. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,048

    anthony myrick
    Member

    I might just see if I can rebuild this thing.
    Why not
     

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