Air filter shootout

Discussion in 'Mopar General Discussions' started by dukeboy_318, Dec 7, 2017 at 6:54 AM.

  1. dukeboy_318

    dukeboy_318 Get off my lawn!!! FABO Gold Member

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    Hadnt seen/found this posted so I think its worth bringing up.

    Engine Masters on Motor trend did a few weeks backs an air filter setup comparison.

    The base engine is a 496 CI Chevy(gulp) making 750 hp without any filter. Listed below are their combos and the resulting hp those filters will support. + means gained hp, - means losted hp from peak hp of the base engine.

    19: 6.25 x 2.5 mini filter= -145.1 for a max of <300
    18: Single Snorkle mopar big block = -95.8 for a max of 300
    17: Foam filter Velocity stack = - 72.4 for a max of 350
    16: Fly's eye(the triangular eddlebrock set up that is somewhat popular) = -71.1 max of 350
    15: Dual Snorkle Mopar= -53.1 hp max of 390
    14: 10x1.25 short air filter, paper element = -33.5 max of 350
    13: 1.5 inch drop base, K&N 14x3 inch filter with K&N filter lid= -18.8 hp max of 650
    12: 14x3 k&N filter, 1.5 drop base, flat solid lid= -12.7 for a max of 660 hp
    11: Dual Snorkle Mopar with the lid flipped upside down= -11.9 hp max of 640
    10: 14x3 flat base and lid with fram filter= -10.1 for a max of 640
    9: B&B lid with K&N filter= -8.9 for a max of 660
    8: 14x3 with K&N filter lid, flat base= - 7.2 for a max of 660
    7: 14x3 flat base with solid lid, K&N element= -6.6 hp and max of 675
    6: K&N filter lid with 14x3 flat base, element tapped up= -3.5 for 675 max
    5: 4 inch tall, 10 in, flat base, solid lid= -1.2 hp and 750+
    4: Open carb, base line: 0.0
    3: K&N velocity stack with filter lid= 0.9 for a max of 750+
    2: Homemade "Salad bowl" with K&N filter lid= +3.0 hp and max of 750+
    1: Open, no element, Velocity Stack= +5.7 hp and max of 750+



    Just some food for thought.
     
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    • Mattax

      Mattax Just the facts, ma'am

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      Here's link to the video Enginemasters Air Filter & Housing tests

      It is interesting.

      One key factor: RPM
      Of course now I've forgotton the baseline peak rpm in that test, but I think it was somewhere around 6500 - 7000 rpm.
      If the engine maxes out at less rpm, and has less displacement, then less surface area and more restrictive filter material/screening can be used with no measurable effect on peak Hp.
      That's the basis the guys used at the end to make some rough top of the head estimates of how much Hp each combo they tested could be OK for.*

      One effect of the air cleaner shapes that the graphs would show (if we could see them all) is the impact on the bowl vents. Air flow into the venturi is important, but changing the pressure in the bowls can do both good and bad things. With Holleys on a NA engine, its best to have consistant pressure in bowls. I speculate that the downflow only shapes may have upped the bowl pressure; where as the downflow with sideflow created turbulence and inconsistant pressures in the bowl.

      *For example.
      15: Dual Snorkle Mopar= -53.1 hp max of 390
      means this combo made around 700 Hp, 53.1 Hp less than the baseline of 750.
      and it would be fine for any engine up to 390 Hp.
       
      Last edited: Dec 7, 2017 at 8:25 AM
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      • doogievlg

        doogievlg Well-Known Member

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        I saw this and was pretty amazed. The latest one with rocker arms is pretty good too.
         
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        • dukeboy_318

          dukeboy_318 Get off my lawn!!! FABO Gold Member

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          yep.
           
        • rumblefish360

          rumblefish360 so close yet so far away

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          Break out the salad bowl!
          Weld a scoop to it!
          LMAO
           
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          • DFX 340 Duster

            DFX 340 Duster FABO Gold Member FABO Gold Member

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            What makes me smile is that an old trick from back in the day was tested such as the "flip the lid upside down". I also remember some 426 Max Wedge guys running velocity stacks and pulling off the elements just before slamming the hood shut prior to their run.
             
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            • qkcuda

              qkcuda Well-Known Member

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              I had noticed that the stock air cleaner was providing a restriction at the track, although I never actually tested back to back. Not hard to figure when you think that the stock lid only provides about 1/2 to 3/4 inch clearance around the bottom. I took and old air cleaner and modified a lid so the filter would be fully open. I run a K&N filter and I just swap lids when I get to the track.

              IMG_4484.JPG

              IMG_3986.JPG
               
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              • 71DodgeDemon340

                71DodgeDemon340 FABO Gold Member FABO Gold Member

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                Personally id keep the second one on all the time. Looks super slick

                :thumbsup:
                 
                Last edited: Dec 7, 2017 at 7:14 PM
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                • 71DodgeDemon340

                  71DodgeDemon340 FABO Gold Member FABO Gold Member

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                  Guess im good then with my dual cut out filter housing.

                  I wonder how it would compare to different hood setups though? For instance on my demon the hood scoops direct fresh air right near the opening in the housing, wouldnt that allow more airflow than a hood without fresh air ports even if you were running a standard open side filter?
                   
                • dukeboy_318

                  dukeboy_318 Get off my lawn!!! FABO Gold Member

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                  Ram air doesn't make a huge difference. A couple hp at the most. And simulating that on a dyno is a challenge unless that dyno happens to be in a wind tunnel. The biggest effect is gonna be from the cooler, slightly denser air charge I would think.