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Projects Flathead Air Cleaner Choice

Discussion in 'Traditional Hot Rods' started by flat-ed, Jan 24, 2021.

  1. flat-ed
    Joined: Oct 19, 2020
    Posts: 13

    flat-ed

    Hi guys! Just finished my Merc flathead intake and carburetors. Trying to decide which air cleaners to use. The motor will be going into a '32 Ford that I don't have yet! What are your thoughts?
     

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  2. Slopok
    Joined: Jan 30, 2012
    Posts: 2,670

    Slopok
    Member

    I think the Helmets look way better but they will choke it.
     
  3. v8flat44
    Joined: Nov 13, 2017
    Posts: 859

    v8flat44

    What ever you do, more air is better. Had a new chrome one with a paper element & it choked it bad. Went back to the old screen type & the 8Ba came alive.
     
    loudbang and flat-ed like this.
  4. It's a good question, and a good thing you asked.
    Having said that, it has been covered many times here so a search should bring you plenty of reading material.
    In short, those small ones look nice but choke the engine.
     
    warhorseracing and flat-ed like this.

  5. Flathead Dave
    Joined: Mar 21, 2014
    Posts: 3,458

    Flathead Dave
    ALLIANCE MEMBER
    from So. Cal.

    Let the motor breath. Get rid of those helmets.
     
    loudbang, Muttley and flat-ed like this.
  6. adam401
    Joined: Dec 27, 2007
    Posts: 2,552

    adam401
    ALLIANCE MEMBER

    Is the second pic the Grace &Co ones? I like those better
     
    flat-ed likes this.
  7. Petejoe
    Joined: Nov 27, 2002
    Posts: 11,073

    Petejoe
    ALLIANCE MEMBER
    from Zoar, Ohio

    Expensive but cool.
    Corvette Boettger air cleaners.

    3C9E2A2A-CEA1-4A57-9C8E-6CB039CC7D03.jpeg C873CFD2-65D2-418C-8074-DFADB30C53EE.jpeg
     
    Dirty Dug, akoutlaw, hfh and 2 others like this.
  8. flat-ed
    Joined: Oct 19, 2020
    Posts: 13

    flat-ed

     
  9. Jack E/NJ
    Joined: Mar 5, 2011
    Posts: 675

    Jack E/NJ
    Member
    from NJ

  10. Joe Blow
    Joined: Oct 29, 2016
    Posts: 754

    Joe Blow
    ALLIANCE MEMBER

    flat-ed likes this.
  11. Ziggster
    Joined: Aug 27, 2018
    Posts: 919

    Ziggster
    Member

    Damn. Did not know that about the helmet. Mine just arrived on Friday from Speedway.

    Some I found which I thought were nice...
    DAD3AD9C-3EE3-4DA3-A928-70C6CBA0F857.jpeg

    F92E3CC9-5604-4B1C-ACA5-BE44A109F136.jpeg

    76E3084C-CE03-4A0F-B282-C3B62A065A70.jpeg

    1CD5521C-F50C-445F-AE94-C9CFBC27E31B.jpeg

    69E0FCE4-8C81-492C-8450-67362F725922.jpeg

    Vintage Speed has some really nice stuff $$$.
     
    flat-ed likes this.
  12. Petejoe
    Joined: Nov 27, 2002
    Posts: 11,073

    Petejoe
    ALLIANCE MEMBER
    from Zoar, Ohio

    These fit inside.
    DFD6B148-33B1-4575-8723-EDC3A47C488E.png
     
    flat-ed likes this.
  13. Petejoe
    Joined: Nov 27, 2002
    Posts: 11,073

    Petejoe
    ALLIANCE MEMBER
    from Zoar, Ohio

    These are cool.
    D1F40B82-21E4-469F-ADE1-9EA92FD89114.png
     
    210superair and flat-ed like this.
  14. Bursonaw
    Joined: Jun 19, 2011
    Posts: 163

    Bursonaw
    Member

    Last edited: Oct 8, 2021
    hfh and flat-ed like this.
  15. Grace & Co get my vote.
     
    flat-ed likes this.
  16. Trash the helmets...
     
    flat-ed likes this.
  17. 2585B6B5-5499-43AF-8C4D-F4CE4776D76E.jpeg F889B4F6-9C3C-498C-8317-D2B00D2E8EFC.jpeg E3C0047B-4B98-4BF0-906E-BD0569CF9A13.jpeg You CAN’T feed an engine 2 much air; it will dictate how much it needs. More air require bigger jets to make the proper air fuel ratio. I bought a K & N style for a Porsche 6 cylinder at a swap meet. Cut out the base out of aluminum—did the same with the top—-Porsche filter in between. Stock jets in Stromberg 97’s are .045—went to .046 with the better flowing K & N—seems just right! 32 Henry cabriolet runs 80 in the 1/8 with gm 5 spd and 3:89 Locker at the track.
     
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  18. Norris McCarty
    Joined: Apr 19, 2007
    Posts: 326

    Norris McCarty
    ALLIANCE MEMBER

    Grace and Company for the win when you quit playing with the helmets and such....that is if you want plenty of airflow AND you want filtered air. Of course if you don’t drive it much or don’t care about your rings, take the filter out of the helmets....it’s the only way they’ll flow any air. Been there and done that.
    596918B6-21E8-4122-B3A4-356A3227DAB4.jpeg
     
  19. fabricator john
    Joined: Mar 18, 2010
    Posts: 171

    fabricator john
    Member
    from venice fl.

    agreed helmets look bada$$ but are chokers
    fabricator john
    miss you dad
     
    loudbang and flat-ed like this.
  20. Bursonaw
    Joined: Jun 19, 2011
    Posts: 163

    Bursonaw
    Member

    If you want helmet type air cleaners that work without restricting your airflow, consider the ones manufactured by Wolk Designs.
    https://www.hotrodhardware.com/index.cfm?ptype=product&product_id=1939&category_id=1031&mode=prod
    After doing some research several years ago on this same subject, I seam to remember that the ones from speedway only have 1/8” gap around the base and the ones from Wolf have a 1/4” gap around the base.

    Hope this helps in your decision.


    Sent from my iPad using Tapatalk
     
    flat-ed likes this.
  21. tubman
    Joined: May 16, 2007
    Posts: 5,852

    tubman
    ALLIANCE MEMBER

    Also, be careful with K&N elements. I have found they flow less than regular pleated elements the hard way. This has been discussed here before.
     
  22. solidaxle
    Joined: Jan 6, 2011
    Posts: 565

    solidaxle
    Member
    from Upstate,NY

    My plugs were always fouling, so I kept jetting down with the bell helmets. There's not a lot of space between the base and cover. On top of that, the elements are too small. I removed the elements and drilled the bases for more air flow. I then had to jet up.
     
  23. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 3,154

    Kiwi 4d
    ALLIANCE MEMBER

    I have run the helmet style with a very free flowing filter , I spaced the helmet up higher so around 1” of filter was visible and more air available ,my top also had the small louvers.
    On the grace and co ones which from the factory have no filter. as we live on an unsealed road , I found a small free flowing lawn mower filter element and fitted slightly taller SS mesh on twin 81 carbs on a 4 banger.
     
    DaveyJonez likes this.
  24. tubman
    Joined: May 16, 2007
    Posts: 5,852

    tubman
    ALLIANCE MEMBER

    Be careful here. How do you define "free-flowing"? I remember seeing a chart that gave the CFM capacities of various OEM filter elements. I was quite surprised to see how large a filter element had to be to pass a significant amount of air. I too, was looking to see if there were any small engine elements that would suit my purposes, and none were even close. It just doesn't make sense that an air filter suitable for a 12 ci 4 cycle engine to come even close to being adequate for a 239 ci engine. That's a 20 times difference. I have spent the last 5 minutes searching for that chart, but could not find it now. If I run across it in the future, I'll be back to amend this thread.

    I am running a 2G on the '51 Merc in my car. I ended up using a filter from Speedway motors with an 8" diameter element 2" high. After some preliminary calculations, I made an extended center stud that allowed me to stack two elements, giving me a total of 100 square inches to feed a carburetor capable of flowing 250 CFM. A little basic calculation gives you the need to be able to filter up to 432,000 cubic inches of air every minute. All of a sudden, 100 square inches doesn't seem to be a lot.

    I am sure there are some engineers out there that can shed some more light on this, but at this time, as far as air filters are concerned, read my signature line.:D
     
    flat-ed and rod noken like this.
  25. 72b
    Joined: Feb 12, 2021
    Posts: 1

    72b

    I used the Edmunds Tall air cleaners from speedway motors. The bases are rubbish so I mounted them on my old helmet bases,
     
  26. Ziggster
    Joined: Aug 27, 2018
    Posts: 919

    Ziggster
    Member

    After purchasing a helmet cleaner, I learned of the very restrictive nature, so I went with this.

    40426D04-E525-4083-9A14-FC701D4F2E08.jpeg

    3745BBA9-4649-4E54-ABE2-95A03F4C490A.jpeg
     
    flat-ed, Hotrodmyk and X38 like this.
  27. clem
    Joined: Dec 20, 2006
    Posts: 3,459

    clem
    Member

    so for the guys that have no filter, but just a bug screen, as shown in the post above, can they have too much air pushing in, especially those with no hoods, does a windy day or higher speed force more air through than required, thus affecting fuel air ratio and either too lean or too rich a condition ?
    I read this on another thread and just curious.
     
  28. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 3,154

    Kiwi 4d
    ALLIANCE MEMBER

    I have been searching for another pair of grace and co air filters , only can find 1 so far. Are they still being made?
     
  29. Bigmac48
    Joined: Apr 3, 2017
    Posts: 483

    Bigmac48
    Member
    from Dundalk Md

    image.jpeg I used my old lid ,taller element with longer stud and wing nut . Tight fit but they go in chrome lid . Filter # 2158 Napa. Again tight fit but pushed them in .
     
    Last edited: Oct 7, 2021
    Kiwi 4d and lothiandon1940 like this.
  30. Flat Roy
    Joined: Nov 23, 2007
    Posts: 486

    Flat Roy
    Member

    An AIR CLEANER has to be able to remove dust and sand to be an AIR CLEANER. If it just has a screen its a bug catcher.:p
     

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