Author Topic: Drilling holes in windscreen (Read 6456 times)

Gusable · « **on:** May 27, 2019, 08:58:07 AM »

I’m having buffeting issues on my 98 ev. In another thread here about helmets someone mentioned drilling hole in the big hard door screen I have. Does anyone have a picture of said holes? I’m thinking of doing a series of like 1 inch holes right under my guzzi sticker.. thoughts?

RinkRat II · « **Reply #1 on:** May 27, 2019, 09:20:27 AM »

All you'll need to know is from the windscreen guru.... JB, Ratguzzi. start here....https://wildguzzi.com/forum/index.php?topic=87353.0

Paul B

kingoffleece · « **Reply #2 on:** May 27, 2019, 09:42:50 AM »

If possible, get some spacers or standoffs and try yo move the screen away from the bike/mounting areas a bit. Most issues are from the low pressure being created behind the screen being filled in. The result creates a vortex and is noisy. Controlled fill of this low pressure area goes a long way toward rider comfort. Not to mention different helmets create different results.

Furbo · « **Reply #3 on:** May 27, 2019, 09:48:30 AM »

I've done this on a stock windshield on a Kawasaki Concours. Helps, but doesn't eliminate the issues. It's a bit of magic to get it right. Looking at your shield, that's gonna be a tough one.

There was a certain faring that was popularized by Frank Wedge (MGNOC) that I know alot of folks really liked on the cali's. Can't recall the name of it as I was out of the Cali business by then. (I had a windjammer on a CAL II).

Good luck!

Wildguzzi.com · « **Reply #3 on:** May 27, 2019, 09:48:30 AM »

Madtownguzzi · « **Reply #4 on:** May 27, 2019, 09:57:16 AM »

Quote from: Furbo on May 27, 2019, 09:48:30 AM

I've done this on a stock windshield on a Kawasaki Concours. Helps, but doesn't eliminate the issues. It's a bit of magic to get it right. Looking at your shield, that's gonna be a tough one.

There was a certain faring that was popularized by Frank Wedge (MGNOC) that I know alot of folks really liked on the cali's. Can't recall the name of it as I was out of the Cali business by then. (I had a windjammer on a CAL II).

Good luck!

The faring I think you are thinking about is a Swanee. The H&H from Harper's is the reproduction of the original.
http://www.harpermoto.com/h-and-h-handlebar-mount-fairing.html

Gusable · « **Reply #5 on:** May 27, 2019, 09:57:50 AM »

Thanks for all the suggestions. I too had a concours 1000 with a cee baileys windscreen that the PO had drilled holes in the base and it was perfect!! im a big believer in windscreen holes and clamp on type visors. I had a honda nc 700x that buffeted BADLY. the puig clamp on visor totally transformed the bike! I don't mind drilling holes in this screen as it has a crack previously that I repaired... so its not pristine im thinking about a flat piece of lexan double sided taped to the screen top as a test.

ratguzzi · « **Reply #6 on:** May 27, 2019, 10:53:42 AM »

Quote from: RinkRat II on May 27, 2019, 09:20:27 AM

All you'll need to know is from the windscreen guru.... JB, Ratguzzi. start here....https://wildguzzi.com/forum/index.php?topic=87353.0

Paul B

I have that bike here in Lansdale, PA Working here for another month or so. It is amazingly nice to be behind, no buffeting or anything. At 70 you feel a slight breeze on your face. Quiet too.
JB

LowRyter · « **Reply #7 on:** May 27, 2019, 11:32:50 AM »

Michael D cut a couple of holes in his factory windshield. He said it helped quite a bit.

They are probably 3 inches or so in diameter and between the grips, maybe a little higher up IIRC. I don't know if Michael follows the forum but you might PM him? Or just experiment.

Gusable · « **Reply #8 on:** May 27, 2019, 12:25:03 PM »

I sent him a pm. We’ll see if he’s around thank you

tris · « **Reply #9 on:** May 27, 2019, 02:07:11 PM »

I had a similar issue with my Breva 1100.

I fixed it (to my liking) by lifting the screen 1/2" clear of the headlamp bucket.

You never know, but might work for you if you have the option

Tris

flower_king001 · « **Reply #10 on:** May 27, 2019, 02:44:22 PM »

I tried several things to eliminate buffering and in the end the BEST setup was the OEM sport shield however....you might try shims on the bottom of your shield like I did once in the photo attached. You can also try to raising the shield above your headlight. Also try tilting it back or forward...perhaps a Laminar Lip might help. No one thing will work for everyone but I will say most folks trying to use a barn door shield like the one you have will get buffering.

Question: are you trying to have no air direct to your face?

Best thing is to get %100 fresh/clean air to your face.

I like short shields just big enough keep air pressure off my upper torso while leaving direct clean air to my head thus no buffering.

Gusable · « **Reply #11 on:** May 27, 2019, 04:19:34 PM »

this is gonna sound silly but the main reason I want to keep the screen is I love the way it looks on the bike! what gets me is manufacturers make products like this that they now is gonna buffet MOST people and they still go ahead and make it that way. they should have done a vent slit or something, lil turn up at the top etc. and the seats! ricky ricardo would be goin off in heavy Spanish describing this ev seat!!! GUZZZI!!! you gotta' lotta splaining' to do!!!! lol

flower_king001 · « **Reply #12 on:** May 27, 2019, 04:49:43 PM »

Quote from: Gusable on May 27, 2019, 04:19:34 PM

this is gonna sound silly but the main reason I want to keep the screen is I love the way it looks on the bike! what gets me is manufacturers make products like this that they now is gonna buffet MOST people and they still go ahead and make it that way. they should have done a vent slit or something, lil turn up at the top etc. and the seats! ricky ricardo would be goin off in heavy Spanish describing this ev seat!!! GUZZZI!!! you gotta' lotta splaining' to do!!!! lol

Enjoying the buffering!

Gusable · « **Reply #13 on:** May 27, 2019, 08:06:23 PM »

I fabbed up a lexan visor that I double sided taped on. I figured out that I can shim out the top windscreen mounts about 5/8ths of an inch. Also going to probably do a single 3 inch hole dead center above the headlight

adaven · « **Reply #14 on:** May 27, 2019, 08:18:22 PM »

I bought an EV last fall that has the touring fairing on it that is enormous. I am looking through the screen. I would rather look over the screen, but the air behind it now is really calm and I worry that if I tinker with it I will never again get it as happy as it is now, although I am tempted. It is a reasonable trade-off for me at this point. What creates one person's buffet is another persons quiet comfort solution.
On a Nevada that I sold I was battered behind the windscreen. A laminar lip didn't help. I tried moving the windscreen to lots of angles and heights with no success. I tried drilling a couple holes about the size of Vetter's vents on either side of the windshield. I tried a Dart Marlin. The only way I got significant improvement was to remove the windscreen altogether.
It is more art than science. You just have to play with it.

Gusable · « **Reply #15 on:** May 27, 2019, 08:31:11 PM »

It can be very fun and rewarding if the goal is accomplished

timonbik · « **Reply #16 on:** May 27, 2019, 08:47:30 PM »

I have Victory Cross Roads that I have buffeting. I have tried adding fork leg lowers (helped a little), then added a lower triple tree deflector (also helped a little) and now going to try a Chinese knock off of a lamar lip. Last resort I am going to install a Goldwing style vent in the windshield above the headlight. Don't like cutting a hole in it but want to get clean air for a peaceful ride.

Gusable · « **Reply #17 on:** May 27, 2019, 08:57:09 PM »

eBay I assume for the knock off lip?

timonbik · « **Reply #18 on:** May 27, 2019, 09:54:25 PM »

yup, cheap and it came surprisingly fast. Goldwing vent also from China.

flower_king001 · « **Reply #19 on:** May 28, 2019, 09:16:43 AM »

Quote from: Gusable on May 27, 2019, 08:06:23 PM

I fabbed up a lexan visor that I double sided taped on. I figured out that I can shim out the top windscreen mounts about 5/8ths of an inch. Also going to probably do a single 3 inch hole dead center above the headlight

Hmm...but it doesn't look good now

MGrego · « **Reply #20 on:** May 28, 2019, 10:00:17 AM »

I had terrible buffeting from a large "Barn Door" style windscreen on my HD Superglide, not too dissimilar from your windscreen. I drilled a couple of holes in the screen thinking I would add some Vetter vents. What I discovered was simply leaving the holes open solved the issue. The holes allowed the air pressure to equalize on both sides of the screen enough to stop the majority of buffeting. At some point prior to that, I added some fork mounted deflectors, but their effect on the buffeting was much, much less than the holes.

If you look close you can see where I drilled the holes.

Gusable · « **Reply #21 on:** May 28, 2019, 10:09:23 AM »

Very cool!

flower_king001 · « **Reply #22 on:** May 28, 2019, 10:16:08 AM »

IMHO..best screen for EV

rocker59 · « **Reply #23 on:** May 28, 2019, 10:23:30 AM »

It works.

Pics from my Quota, but same concept:

Testarossa · « **Reply #24 on:** May 28, 2019, 10:40:42 AM »

Big holes work to stop buffeting but won't stop rain. Vetter solved this problem decades ago using pop vents. You can spend a lot of money on pop vents or buy them cheap from aircraft supply houses. See https://www.univair.com/categories/miscellaneous/snap-vents.html

Gusable · « **Reply #25 on:** May 28, 2019, 01:44:58 PM »

Yes I’ll take mustard on my hot dog... 👍. Pop vents are super cool. Great idea

inditx · « **Reply #26 on:** May 28, 2019, 03:39:00 PM »

Quote from: Testarossa on May 28, 2019, 10:40:42 AM

Big holes work to stop buffeting but won't stop rain. Vetter solved this problem decades ago using pop vents. You can spend a lot of money on pop vents or buy them cheap from aircraft supply houses. See https://www.univair.com/categories/miscellaneous/snap-vents.html

Very clever Testarossa!
So, start with 2 and go from there? Large or small?
Attach by glue then?
Sorry, just a brand new idea for me.
Thanks,
inditx

boatdetective · « **Reply #27 on:** May 28, 2019, 06:24:23 PM »

I bought a California Scientific screen and they use large holes. Seems to work well. I'd recommend looking at some of their screens for inspiration. I also bought an MRA screen for the top- which is highly adjustable. There is some wind noise, but it really helps with buffeting on your torso.

Testarossa · « **Reply #28 on:** May 28, 2019, 11:53:13 PM »

Quote

So, start with 2 and go from there? Large or small?

Vetter's late-model Windjammer used two pop vents. In this photo I'd guess the vents are about three inches, assuming that's a 7-inch headlamp.

janguzzi · « **Reply #29 on:** May 29, 2019, 01:27:09 AM »

Similar topic:
https://wildguzzi.com/forum/index.php?PHPSESSID=449b7db99e6e2ce29d4fec405af248b4&topic=101106.0

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Author Topic: Drilling holes in windscreen (Read 6456 times)

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