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Automotive-Style Air Filter Conversion-(not a instructional)

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  • #1

    Automotive-Style Air Filter Conversion-(not a instructional)

    For all those interested, the PO of my bike coverted his airbox to accomodate an automotive-style square airfilter. I assume all he did was cut the bottom of the box and inserted the filter. He was an engineer, so, it may be more complex than it looks. My concern is the dynamic it plays on air intake flow versus a sealed airbox.

    http://db.tt/q4fWmooY
    1979 XS1100F
    2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
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  • #2
    Originally posted by IanDMacDonald View Post
    For all those interested, the PO of my bike coverted his airbox to accomodate an automotive-style square airfilter. I assume all he did was cut the bottom of the box and inserted the filter. He was an engineer, so, it may be more complex than it looks. My concern is the dynamic it plays on air intake flow versus a sealed airbox.

    http://db.tt/q4fWmooY

    Hmmmmmm.........the hole for the snorkle will have had to be sealed up and all air drawn from the bottom.

    Is the bottom of the airbox still used? The 4 bolts that originally held it on couldn't be used.

    I need a closer look at that. I'm intregued.
    Greg

    Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

    ― Albert Einstein

    80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

    The list changes.

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    • #3
      Kinda the same idea as what I've done....http://www.xs11.com/forum/showthread...&highlight=air .... although I completely gutted the air box and retained the lower half for a larger plenum. Without knowing what's inside yours, hard to say how well it works.
      Fast, Cheap, Reliable... Pick any two

      '78E original owner - resto project
      '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
      '82 XJ rebuild project
      '80SG restified, red SOLD
      '79F parts...
      '81H more parts...

      Other current bikes:
      '93 XL1200 Anniversary Sportster 85RWHP
      '86 XL883/1200 Chopper
      '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
      Cage: '13 Mustang GT/CS with a few 'custom' touches
      Yep, can't leave nuthin' alone...

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      • #4
        air box mod, etc.

        Hello-
        The air box mod I did, blocked off the original "snorkel" hole. The bottom half of the original air box was junked. I fabbed up a .12" steel bottom with the square hole cut for the new about 8"x 8" waffle style automotive air cleaner. 4 screws through 2 clamps to hold it. The air cleaner I chose was one that has a more rigid plastic frame and a seal. Even though it is steel, it weighs less than stock lower half of the original. 2 vent lines still plug into the box, but all those plastic tubes are in the trash can. The air flow dynamic acts like a giant plenum and sounds throaty and a bit like a 4 barrel carb on a small block (with the lid not flipped). The rpm range broadened(better flow), it tricks the slides into better and slightly sooner opening since the vacuum in the box is reduced since the wimpy stock briggs and Stratton air filter is no more.
        The distributor centrifigul advance curve reduced, allowing the initial to be increased, no vacuum advance.
        Head was milled like .060 which left the piston to valve clearance a bit tight at .07 and .08. I can't remember the exact compression, but it may be in the notes. I think it's about 10.8:1. The valves are backcut and the bowls are ported mildly. One puck is shimmed, (I don't like that- I was poor at the time), but it ran for ten years the strong use without a tick.
        O2 sensor in the header for jetting. It's rich enough to run open headers.
        ~40 MPG
        Without mufflers it will flip backward without popping the clutch at any speed in 1st gear and most of 2nd. Didn't like the Jardines as much as the pipes that are on there. Reduced the rpm at max horsepower. Makes strong power to 5500-9200 without a hitch.
        Scott
        79 F; CNC cut 2nd gear dogs; Ported/Milled head; Modded Airbox 8x8 bottom auto filter; more initial timing adv. , less Cent., no Vac. Adv.

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        • #5
          air box

          I'm the PO who modified Ian's bike. Anyone need some jardine spegetti headers?
          79 F; CNC cut 2nd gear dogs; Ported/Milled head; Modded Airbox 8x8 bottom auto filter; more initial timing adv. , less Cent., no Vac. Adv.

          Comment

          • #6
            Originally posted by shousey440 View Post
            I'm the PO who modified Ian's bike. Anyone need some jardine spegetti headers?
            Hell yeah! Let me know via PM how much you want and we can do a deal if shipping to Canada is not too much of a pain.
            2-79 XS1100 SF
            2-78 XS1100 E Best bike Ever
            80 XS 1100 SG Big bore kit but not fully running yet.
            Couple of more parts bikes of which 2 more will live!

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