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Thread: DIY Randall Intake w/detailed instructions!!!

  1. #1
    Idling - Listen to it purr...
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    DIY Randall Intake w/detailed instructions!!!

    So you've probably heard about the Randall intake which takes air from the high pressure, sealed off area before the windshield. A lot of members use accordion type piping since it's easier to manipulate the thing. But accordion piping have the ridges and is not optimal for smooth air flow. I chose PCV piping and had to trim the pipings a bunch of times, so I figured I'd put together somewhat of a detail write-up. Save some time for future DIYers. Of course I wont be responsible for any damages done following this guide.

    Tools and Parts used:
    - 90* 2" elbow (3)
    - 2ft 2" PVC pipe (1)
    - 2" rubber coupler, no hub, with heat shield (1)
    - 3/8" rubber hose (used to line the hole in the firewall)
    - PVC hand saw, super easy to cut PVC pipes
    - 2 1/2" bi-metal hole saw w/arbor and drill bit
    - shop vac was VERY useful for clean up, you'll have lots of metal and PVC shavings all over
    - Eyes and ear protections for when cutting the firewall

    Note: the Randall intake I followed mentioned PVC cement to seal the junctions of the pipes. I did not use any, it's easier to disassemble if they're not fixed together permanently. Also I found the other 2" coupler found at the hardware store was too long to be used with this particular application, it's probably would be a better choice since the rubber is a lot thicker.

    First, disconnect the OE intake snorkel, I also took off the 2 bolts and 1 nut that hold the intake box to chassis, so it's easier to manipulate everything. Then cut the 2ft pipe into 4 segments, as follow (yes, you'll have a lot extra):
    #1 - 3 1/2"
    #2 - 2"
    #3 - 4 1/4"
    #4 - 1 3/4"



    Assemble everything with the exception of segment #1. Just so you can see where the hole needs to be. Make sure you cut a hole so that the plumbing wont put stress on the clutch reservoir. Here's a pic for idea:





    After the hole is cut, you can apply to paint to prevent rust. Also, a Dremel or file can be used to remove the burs after the hole is cut. Then, cut a slit in the 3/8" hose and use it to line the hole. #1 segment will take some elbow grease to get in the hole, it's a snug fit. But, being #1, it can get into any damn hole it wants to. Finished product:




    Hopefully you wont have this many rings:



    Results: nice throaty rumble near and at WOT, notice hesitation during acceleration is gone, throttle is more responsive. Have fun!

    Next up: advance timing by 14*!!

  2. The Following 4 Users Say Thank You to 95montego For This Useful Post:

    Agent☣Orange (01-22-2014),atank (09-20-2013),NCGreasemonkey (12-23-2015),Phatmiata (09-02-2013)

  3. #2
    2,000 rpm - light wheelspin, no bog here!
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    Looks pretty sweet, how much did this entire set up cost you?

  4. #3
    5,000 rpm - there be torque here! psulja's Avatar
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    Great write up; thanks for posting this up here!
    Paul | IG- @psulja
    Build thread:
    1991 Mariner Blue - Built 1.8 swap, EFR, Fab9Tuning, Tii drivetrain

  5. #4
    Idling - Listen to it purr...
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    Hmm lets see...

    hole saw ~$15
    pvc saw ~$5
    pvc piping/elbows ~$20

    way cheaper than an actual CF Randall intake pipe, which is around ~150, or the JR intake, which is around the same price if not more

  6. #5
    Idling - Listen to it purr...
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    I like this
    Will be doing it this weekend

  7. #6
    5,000 rpm - there be torque here! The Driver's Avatar
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    I like this even better than the other Randall CAI thread! Sweet deal!
    96 Montego, replacing a 95M... I miss: My running peeps in Tampa, running barefoot @ Clearwater Beach and First Choice BBQ, in Brandon. In So Cal I miss: The Malibu Canyons, CA 33 and In & Out Burgers ! I'm from Tampa, if I was from Tampa Bay, I'd be a fish!

  8. #7
    Idling - Listen to it purr... mrdos's Avatar
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    Can you post a pic of the entire bay? Want to see what the entire set up looks like

  9. #8
    3,000 rpm - starting to feel the power BoBo's Avatar
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    ^ Same here, I have an FM Shock Bar but can't use a Randal Cowl. I want to see if it looks clean, I was thinking about using an ebay shock bar and racingbeat intake as an alternative.
    08 Kawasaki Ninja 250R Tuned/Track Prepared
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  10. #9
    Idling - Listen to it purr... finnthehuman's Avatar
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    Great write up.

    I am however just wondering,

    How did you attached the larger bore pipework to the stock airbox which only has a small inlet?

    Many thanks

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