Windscreen holes to reduce turbulence - Suzuki Burgman Forum
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post #1 of 28 (permalink) Old 08-02-2013, 10:56 PM Thread Starter
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Windscreen holes to reduce turbulence

The "The Riders Magazine (29th July)<http://www.ridermagazine.com/top-sto...irst-ride.htm/> review of the 2013 Burg mentions " Holes were added to the lower edge of windscreen to reduce turbulence, but the screen flutters at high..." The 'back of the neck' turbulence on my K7 Exec. (with a Givi D263 ST) is excessive at whatever height the screen is set. Can anyone confirm that "holes at the lower edge" reduce turbulence? Presumably the holes allow air through to reduce the low pressure behind the screen and thus reduce the amount of air rushing back to fill the void? If so, please give me the specs for the holes - diameter (mm please), number of holes, specific location in relation to bottom edge/support brackets etc. Any useful comments/recommendations would be welcome before I start boring.

Last edited by shavian; 08-02-2013 at 11:00 PM. Reason: to improve readability & clarify
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post #2 of 28 (permalink) Old 08-02-2013, 11:38 PM
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I added some steel washers under my shield that allows air under. Try that and see.
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post #3 of 28 (permalink) Old 08-13-2013, 01:03 AM
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Hi shavian,
On my 2013 650, the "holes" are NOT in the windscreen, they're in the windscreen cover. The air therefore passes under the "glass" and is directed straight up the backside of the glass helping flow the air higher off the top of the windscreen. Being my first burgie, I have no opinion on whether or not the holes are an improvement.
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post #4 of 28 (permalink) Old 08-13-2013, 07:26 AM
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Quote:
Originally Posted by Dave_J View Post
I added some steel washers under my shield that allows air under. Try that and see.
Will this work with a Givi on a 400?


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post #5 of 28 (permalink) Old 08-13-2013, 11:54 AM
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Will this work with a Givi on a 400?
Does not work on the 400 because the windshield is mounted different than on a 650.

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post #6 of 28 (permalink) Old 08-13-2013, 01:48 PM
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I fitted one of these to mine and it made a dramatic difference. http://rifle.com/Vents-C541.aspx

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post #7 of 28 (permalink) Old 08-13-2013, 04:31 PM
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Will this work with a Givi on a 400?
The hole between the headlights pushes air behind the windshield on 400s. On my '08 I can stick my hand in and see my fingers through the shield.
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post #8 of 28 (permalink) Old 08-13-2013, 10:03 PM
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The hole between the headlights pushes air behind the windshield on 400s. On my '08 I can stick my hand in and see my fingers through the shield.
Never noticed that. I wonder what would happen if you plugged that off, or taped it off? Warmer on the cooler days?


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post #9 of 28 (permalink) Old 08-13-2013, 10:26 PM
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I've added a four holes to the base of my Givi windscreen. It reduced the turbulence somewhat but noise levels seemed the same (earplugs only in my case).

Start with a 1/4" spade bit to place the holes. Space them to allow for enlargement if needed. Before you break through, put the drill in reverse and push--this will melt though the last bit and reduce potential cracking. If you're drilling the windscreen while it's on the scoot, put a barrier behind it, so the drill point doesn't prick the dash housing.

Air does flow through even at 1/4" diameter holes, but not much (enough to blow plastic shavings out). I increased the holes to 3/8", then (after a test ride) to 1/2". As I mentioned previously, it seemed to help a bit.

Given all the curves and protrusions, I doubt the Big Burg is very aerodynamic and the rider/equipment variables complicate matters further.

Edit: I also cut the screen down by 4", since I dislike looking through windscreens on motorcycles--once they pickup bugs/mist (especially commuting in the rain), they get difficult to see through. It also reduced the quite strong buffeting at helmet level.

Last edited by Flywheel; 08-13-2013 at 10:30 PM.
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post #10 of 28 (permalink) Old 08-14-2013, 02:06 AM
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I cut 2 50mm (2") holes at the bottom of my cracked Giwi screen as an experiment, and it works so well that I never use the undamaged replacement, which gives more buffeting and noticeably worse fuel mileage.

Someone here had a Madstad screen made for his Burgman. The Madstad goes one step further and works like an air deflector, with equal amounts of air passing on both sides of the screen.+

Madstad Windshield on the 650

Madstad Windshield
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Last edited by ErikDK; 08-14-2013 at 02:12 AM.
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