Windshield

[Guzzidad]

   When I bought my 02 California Special Sport it came with a Guzzi windshield. Hate to admit this but it was horrible to ride behind.
   


   So I bought a fly screen just to keep bugs off the speedo and tach. Well, that was better, but it didn't offer much wind protection. So today I dug out the original windshield and re-installed it with spacers under the bottom screws to increase the angle. Spacers were about 9mm. Unbelievable difference. I can live with this now, and it looks pretty good too.

[Tom H]

Nice!!

Tom

[ratguzzi]

   When I bought my 02 California Special Sport it came with a Guzzi windshield. Hate to admit this but it was horrible to ride behind.
   


   So I bought a fly screen just to keep bugs off the speedo and tach. Well, that was better, but it didn't offer much wind protection. So today I dug out the original windshield and re-installed it with spacers under the bottom screws to increase the angle. Spacers were about 9mm. Unbelievable difference. I can live with this now, and it looks pretty good too.

Do me a favor. Since you replaced it, take the old one and fill it top to bottom with 3/8" diameter holes, like swiss cheese. Try it again and I bet it will be the very best windshield you ever sat behind. I have done this many times with flawless results. Even with the Guzzi "barn door"
JB

[Moparnut72]

What is your theory on how this works? Prior to my Audace I owned a Harley Slim. I tried every sort of windshield on that bike ut could never get rid of the buffeting. I even got one with a recurve at the top. I got it in the fall and only rode it around town. Fatest speed ws about 50 or so, I thoughtI had finally found the solution. Then spring came and I had to ride it to the dealer beacause of a recall. Once I got up toreal speed it felt like I had lost a wheel weight or worse the whole bike was shaking. I even had fork fangs on that bike. I finally gave up and ride both of my bikes naked, the bikes that is. Years ago I had an R75/5  that I put an Avon Fairing on. It was a verycalm ride, in fact it worked so well I had a slight pressure on my back. It was however a full fairing with lowers mounted to the frame.
kk

[Zenermaniac]

Do me a favor. Since you replaced it, take the old one and fill it top to bottom with 3/8" diameter holes, like swiss cheese. Try it again and I bet it will be the very best windshield you ever sat behind. I have done this many times with flawless results. Even with the Guzzi "barn door"
JB

Interesting idea! How far apart are the holes? Any pictures?

[Thunderbutt]

Moparnut- but cutting the holes in the windshield you are allowing air in behind the shield and receiving some of the air pressure which cause the buffeting.

There is a high air pressure on the front of the windshield and a low pressure are behind it as you ride.  By cutting those holes your allowing a slight amount of high pressure air behind the shield to reduce the low pressure area slightly.
At least this is the way it has been explained to me.  Someone with more technical explanation can correct me if I am wrong.

[kingoffleece]

The CalSci web site has a detailed explanation of the vortex being created by pressure.

[oldbike54]

 Tilting the windshield back does the same thing as drilling holes , it allows some air to flow behind the shield , balancing the pressure . Nothing complicated about any of this , air acts exactly like water , pressure differential causes turbulence .

 Dusty