Updated DIY Radiator Guard

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by AdvRonski, Dec 23, 2012.

  1. AdvRonski

    AdvRonski They call me......Ronski

    Joined:
    Feb 4, 2007
    Oddometer:
    839
    Location:
    Finally made it to Fruita!
    Last winter I used the down time to make a stainless steel rad guard, details- HERE
    It turned out a little on the heavy side, but it could probably with stand a shotgun blast, and seemed to work well.
    I did have one incident, though. ( This one time, at band camp.............)
    While heading home from Moab via Sego Canyon, I hit the freeway at Thompson, and ran her up to 90 mph in the 100+ degree heat. After about 30 minutes, the coolant temp shot up, and it began to spray Engine Ice onto my right boot.
    I had to slow to 45-50 to keep it at least close to the normal temp, but I made it back to Grand Junction OK.
    After topping up the coolant the next day, I had no further problems for the rest of the year.
    But, I wondered if the tight mesh of the rad guard wasn't flowing as much air as I thought.
    I decided to make a lighter guard out of stainless steel, without the expanded metal, but with a coarser, heavier gauge mesh.
    Here's the chunky original-

    [​IMG]

    And the new, improved version-

    [​IMG]

    The lighter outer frame still makes a fairly stiff structure when mounted-

    [​IMG]

    But, how to measure relative airflow through each guard?
    I made a crude airflow meter from cardboard and duct tape, and used a partially shrouded fan to provide the air.
    First, the baseline reading. ( Try not to laugh too hard at my contraption)-

    [​IMG]

    The unrestricted airflow moved the weighted flap about 7-8 inches. Actually, the flap is "zeroed" at 2 inches, but I just didn't think to move the high-tech base to set it to zero. So, call it 5-6 inches.

    OK, now the original guard is put in place-

    [​IMG]

    Wow, only about 1.5-2 inches of deflection/airflow. That guard really choked off the air to the radiator!

    And, finally, the new and improved version is tested-

    [​IMG]

    Holy Cow! Roughly 3.5-4 inches! That's about twice the flow of my original guard!
    Granted, the whole thing is pretty crude, but it's clear that airflow will be much improved.

    Plus, it's almost a pound lighter-

    [​IMG]

    [​IMG]

    The installed unit fits and looks good. Well, to me anyway.

    [​IMG]

    Next Up- I update the waterpump with a CJ Design Super Shaft and 2009 impeller and cover.
    #1
  2. rossguzzi

    rossguzzi 990 Adv.

    Joined:
    Oct 21, 2012
    Oddometer:
    1,662
    Location:
    Bottom left hand side of OZ
    Aint science wonderfull :)
    #2
  3. bajarider1

    bajarider1 Adventurer

    Joined:
    Mar 1, 2009
    Oddometer:
    32
    Location:
    Sewickley, PA
    Nice work and I like how thorough you were in the R&D department.
    #3
  4. Steveman

    Steveman Been here awhile

    Joined:
    Sep 14, 2011
    Oddometer:
    471
    Location:
    Austria
    Looking at the "old" design it was clear that this will cause trouble, covering at least a third of the radiator. Way to much imho.
    Cross my fingers that new design will work. I use no rad guard BTW and never had an issue :freaky

    Merry Christmas !
    #4
  5. HeatXfer

    HeatXfer Bad knees

    Joined:
    Feb 18, 2008
    Oddometer:
    799
    Location:
    S.F. Bay Area
    Nicely done.
    #5
  6. Scott Baja

    Scott Baja el semental rojo

    Joined:
    May 27, 2010
    Oddometer:
    244
    Location:
    Missoula MT
    Very impressed! Clean nice looking work, and very clever testing. You are to be highly commended! :clap
    #6
  7. Vicks

    Vicks gets stuck in sand

    Joined:
    Oct 4, 2006
    Oddometer:
    3,335
    Location:
    gone RTW...
    brilliant :clap:clap
    #7
  8. gefr

    gefr Life is a trip

    Joined:
    Nov 26, 2005
    Oddometer:
    4,732
    Location:
    East Med, Greece
    I find your lab equipment brilliant. Nice improvisation. Cheers.
    #8
  9. Megadeus

    Megadeus Motorcycles are therapy

    Joined:
    Oct 4, 2006
    Oddometer:
    266
    Location:
    9.8 psi
    You best Redneckonize! Ya' Hear!

    [​IMG]
    #9
  10. DesertSurfer

    DesertSurfer Tail sprayin

    Joined:
    Feb 20, 2009
    Oddometer:
    2,068
    Location:
    City of the Angels
    I wonder if the fatter mesh creates a large backwash diverting flow to the outside of bike's radiator as well as restrictive flow?

    Great food for future thought.
    #10
  11. Zuber

    Zuber Zoob

    Joined:
    Sep 28, 2004
    Oddometer:
    2,877
    Location:
    Main Street, Shedd, Oregon
    " I'm not a Doctor, I have a Master's Degree",..." IN SCIENCE!!"

    Were did you find the wire mesh? McMaster-Carr?
    #11
  12. AdvRonski

    AdvRonski They call me......Ronski

    Joined:
    Feb 4, 2007
    Oddometer:
    839
    Location:
    Finally made it to Fruita!
    I had to think about that one a bit, but it was Summit Racing- http://www.summitracing.com/parts/aaf-all22270/overview/
    They also have the AN fittings and hose for the remote oil drain mod- $50 shipped.
    #12