March 15th, 2012, 09:31 AM | #1 |
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Drilling the windscreen
I cant find ANY info on this! but Ive seen it a lot on the Isle of man TT bikes and some other race or touring bikes. They seem to drill 3-6 holes in the bottom on the windscreen, I'm guessing this is to relieve a little bit of wind pressure when it goes over the top? Maybe it keeps the wind down behind because of the pressure release
Any Ideas? I'm about to just drill into mine and see if it changes anything
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March 15th, 2012, 11:25 AM | #3 |
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March 15th, 2012, 11:26 AM | #4 |
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March 15th, 2012, 11:57 AM | #5 |
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I haven't heard of that, but it does sound similar to that "air curtain" design the last 650r had.
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March 15th, 2012, 01:56 PM | #6 | |
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March 15th, 2012, 01:58 PM | #7 |
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So tempted to drill -___-
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March 15th, 2012, 02:04 PM | #8 |
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http://www.ninjette.org/forums/showt...9&postcount=12
post 12 my sneak78 http://www.redracingparts.com/englis...RNinja2005.php
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March 15th, 2012, 11:15 PM | #9 |
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I'm interested to see what a drilled screen looks like. It seems like a pretty small gain (over DB) if it looks bad.
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March 15th, 2012, 11:56 PM | #10 |
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Speed holes, eh?
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March 16th, 2012, 10:17 AM | #11 |
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Is it the same concept as some of the super sports having the windscreen not attach at the bottom and having a gap? (Like the current ZX6r)
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March 16th, 2012, 10:20 AM | #12 |
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This is what im thinking too, Yamaha has been doing it for a while on the fzr... Hmm I'm going to go drill
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March 16th, 2012, 10:39 AM | #14 |
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Step 1:
Drill 3 small pilot holes half an inch apart Step 2: Drill 3 holes with a 11/64th bit Step 3: Angle the drill bit down as its spinning to open the hole in the direction of the air End result:
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March 16th, 2012, 10:40 AM | #15 |
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I'll let you guys know if it works or not
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March 16th, 2012, 10:52 AM | #16 |
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Those holes seem too small to have much of an effect. I'm curious to hear if it makes any difference.
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March 16th, 2012, 11:05 AM | #17 |
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We will see what happens, I didnt want to drill big ass holes and have it not work lol
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March 16th, 2012, 11:08 AM | #19 |
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March 16th, 2012, 12:37 PM | #21 |
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Actually I don't think that looks bad at all. I'm also guessing they are too small to have much effect, but you may be on to something. This is where nicely sharpened drill bits will come into play.
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March 16th, 2012, 12:41 PM | #22 |
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Actually, be very careful with sharp bits and acrylic, its much better to drill with a dull bit. The sharp edges will catch and will shatter the plastic thats why its better to use different sizes to get to your final goal
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March 16th, 2012, 12:58 PM | #23 | |
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Quote:
I'm thinking a deremel tool might be a good alternative to a regular drill. Do you agree?
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March 16th, 2012, 01:00 PM | #24 |
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unless you have water pouring on it the whole time no, ive used them before and with it spinning so fast the bit heats up and melts the plastic/acrylic If its a variable speed one then you should be fine but a normally drill has been the easiest to work with so far
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March 16th, 2012, 01:30 PM | #25 |
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The vents diminish the low pressure zone between the rider and the bike, and thus reduces the turbulence in that area (most notable when your head/helmet shakes back and forth). Those holes are too small though :P
Some examples: S1000RR (comes stock, but this shows the holes easiest) An aftermarket for the Ninja 650R Ninja 1000 (More of a raised windscreen) If I had to guess.. A lot of pro circuit bikes don't have this as they tend to move in and out of bike more than road racers do, so the turbulence is not as discomforting/irritating. Iono though. The whole vented windscreen looks to be very popular among sport touring bikes for obvious reasons! And you can probably get away with a grinding wheel in a drill and a vacuum to suck up the chips/dust. Patience, patience, patience! Also: The stock 250 windscreen is polycarb and not acrylic, so you have to be even more careful with drill bits that can catch! |
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March 16th, 2012, 11:10 PM | #26 |
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March 16th, 2012, 11:13 PM | #27 | |
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http://motorcycleinfo.calsci.com/Fairing.html
Quote:
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March 16th, 2012, 11:18 PM | #28 |
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OK - dumb question.... on a REALLY cold night, in a tucked position, would it be any colder behind a vented shield vs. un-vented shield?
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March 16th, 2012, 11:20 PM | #29 |
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I doubt that those 3 little holes are going to make any significant difference in temp, considering that the engine is releasing heat right there.
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March 16th, 2012, 11:31 PM | #30 | ||
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March 17th, 2012, 02:08 AM | #31 |
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Same here. Seen that happen. Only way for sure is to get an answer from the engineers who designed it or do some good ol testing.
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March 17th, 2012, 06:52 AM | #32 | ||
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Quote:
Quote:
@choneofakind 's quote was from a website that manufactures aftermarket windscreens (See the Ninja 650 windscreen photo above). |
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March 19th, 2012, 07:51 PM | #33 |
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So today I finally had a good little ride to see how the holes are, it could be a plasibo but I feel that they make a pretty good difference! Its not huge but in a tuck it is for sure nicer, and it was windy as **** today and it felt better. Even at a 125 it felt a lot better (not like I would know )
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