12-25-2015, 02:16 AM | #46 | ||
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
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Jay and Detours are correct. It is the internal construction of the OCS which matters, not the pinch in the tube. The pinch in the tube merely indicates the OCS has been positioned upside down, and will cause the OCS to deposit more gasoline in the collection tube, instead of allowing more gas fumes to be drawn into the air box, and added to the fuel/air mixture. As Jay stated, proper orientation of the OCS might not noticeably increase fuel mileage. However, it will allow more gasoline fumes to be consumed by combustion, rather than condensing the fumes as liquid fuel in the collection tube. As Detours has shown in the following photograph, the screen inside the OCS is shaped like a cup. http://www.chinariders.net/showthrea...el+tube&page=6 The photograph aboves shows the OCS in the upside down, or incorrect orientation. In this position the gas vapors drawn from the crankcase only pass through the side of the screen, since the top is open. This increases the velocity of the fuel vapors as they are drawn toward the air box. As the velocity of a fluid increases, pressure decreases, according to Bernoulli's Principle. https://en.wikipedia.org/wiki/Bernoulli%27s_principle Bernoulli's Principle predicts the air traveling over the top of an airfoil must move at a faster speed than the air moving under the air foil. Therefore, the top of the airfoil has lower air pressure, which generates lift.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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12-25-2015, 02:16 AM | #47 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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However, lower pressure also promotes the condensation of gases, as shown in the video below. Therefore, when the OCS is positioned upside down, the lower pressure increases the condensation of fuel vapor.
The video below shows the wing of a Boeing B737-400 taking off in the rain from Seattle-Tacoma airport. Just as the plane starts to lift off the ground condensation is observed over the top of the wing. This phenomenon is caused by low air pressure over the wing causing water vapor in the humid air to condense.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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12-25-2015, 02:27 AM | #48 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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When the OCS is positioned properly, the cone of the screen is located at the top of the OCS. As the fuel vapors pass through the second screen, their velocity is decreased. The decrease in vapor velocity results in an increase in vapor pressure. This higher pressure helps the volatile fuel vapors to remain in a gaseous state. The less volatile water vapor condenses to a liquid, which is collected in the down tube. More of the volatile fuel vapors remain in a gaseous state, and are drawn into the air box, where they are consumed in the combustion process.
Detours has verified the collection of less fuel in the down tube after he flipped his OCS to the correct orientation. http://www.chinariders.net/showthrea...el+tube&page=9
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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12-25-2015, 02:30 AM | #49 |
Join Date: Oct 2015
Location: Berthoud, CO
Posts: 205
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Spud, Jay, Detours
Thanks for setting me straight. Spud - what was making me crazy was that you had two photos with the OSC in the same direction and you said one of them was wrong. It's all OK now. Thanks
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Dan CSC RX3 Cyclone, CSC TT250, Moto Guzzi V7 II, KLR650 |
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12-25-2015, 02:30 AM | #50 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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When the OCS is positioned as show below, the internal screen is in the correct position, with the cone of the screen at the top.
Since we can't see inside the OCS for the proper orientation of the screen, we use the external location of objects to verify the proper orientation. The tube should be located at the top of the OCS. The clamp should be located at the bottom of the OCS.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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12-25-2015, 02:37 AM | #51 |
Join Date: Jul 2008
Location: Idaho
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When the OCS is positioned as shown below, the internal screen is in the incorrect position, with the cone of the screen at the bottom.
Since we can't see inside the OCS for the improper orientation of the screen, we use the external location of objects to verify the improper orientation. The tube should be located at the top of the OCS. The clamp should be located at the bottom of the OCS. These objects are inverted in the photo, which shows the improper orientation. The big loop in the tube also indicates the internal screen is improperly oriented. The tube has a big loop because it must travel to the bottom of the OCS. The problem is not caused by a pinch in the tube. The big loop in the tube is merely an external indication that the internal screen is upside down, which will promote the collection of more liquid fuel in the down tube.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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12-25-2015, 02:45 AM | #52 |
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Location: Idaho
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Even if the OCS is upside down, you might not collect any fuel in the down tube. The fuel vapors are still condensing into the tube, but the tube might not be thoroughly sealed. If you shave/sand any imperfections in the plug, and seal the plug with grease, you will definitely collect a mixture of water and fuel in the down tube.
When the OCS is oriented properly, you will collect less condensed fuel in the down tube. This will better protect the environment, and reduce maintenance, since it allows you to empty the tube less frequently. It will also improve fuel mileage, but the improvement will be so small it will probably not be noticeable.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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12-25-2015, 02:48 AM | #53 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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If you seal the plug so it collects liquid, you will notice more liquid in the tube with the OCS in the incorrect position. If you flip the OCS to the correct orientation, you will collect less liquid in the down tube.
The difference in liquid volume results from a decrease in condensed fuel. Instead, more fuel vapors are being conducted to the air box, where they will be added to the fuel/air mixture, and burned.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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12-25-2015, 02:50 AM | #54 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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You're welcome. I re-examined the photos, and you are correct. I made a mistake, and I'm sorry for causing the confusion. I have corrected the original post. The correct photos are also shown above in post #50, and post #51.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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12-25-2015, 12:50 PM | #55 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Perhaps one might install a valve, rather than the plug. Pull up to the campsite, open the valve, harvest the campfire starter and start a fire.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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12-25-2015, 01:03 PM | #56 |
Join Date: Aug 2015
Location: Upstate NY
Posts: 343
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I did notice after riding yesterday that the little fluid that collected in the catch tube was a higher percentage water than fuel, it had a faint gas smell vs the strong smell previously. Looks like the separator is working properly now. I would expect some condensation to be removed as the humidity is over 80% here very often.
I don't think the fuel in the tube will make any significant impact on the MPG for the bike. That's more a result of a heavy guy who likes to wind up the bike often. Even when I'm gentle on the bike I still get 55mpg, it just takes more effort to get me up a hill Merry Xmas everyone, hope your stocking were full of t-handles and other various goodies today! Still in the 40's so it's time for a rare Christmas motorcycle ride. |
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12-27-2015, 07:24 PM | #57 |
Join Date: Sep 2014
Location: Northeast Oregon
Posts: 40
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After reading this thread I went out to the cold(24 f) garage and checked my OCS. Mine was upside down! I have almost 2500 miles on the moto and my MPG with the stock gearing was always around 72.
I'll have to wait for a warm enough day to wash the moto and them flip the OCS over.
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Current Motos: 2015 RX3, 2016 CSC TT, 1975 Honda XL250 |
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12-27-2015, 08:44 PM | #58 | |
Join Date: Jul 2015
Location: Milpitas, CA. USA
Posts: 775
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I like it. Shows character. |
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12-27-2015, 08:53 PM | #59 |
Join Date: Sep 2014
Location: Northeast Oregon
Posts: 40
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LOL, yes it stays fairly dirty except for the chain and the fork stanchions.
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Current Motos: 2015 RX3, 2016 CSC TT, 1975 Honda XL250 |
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12-27-2015, 09:16 PM | #60 |
Join Date: Jul 2008
Location: Idaho
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X2; a dual sport bike doesn't look good until it gets dirty.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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