Don't like your KLX without a snorkle or lid?
#11
03-31-2014 | 05:55 PM
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From: Delaware, Ohio
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I'm not sure, Mark...I was concerned about this originally before I cut the larger hole in the OEM airbox top back when. After closely inspecting this area when the saddle is on, and after a few years of running it this way, I'm not seeing a water issue here. Splash and rain seems to have no good access to the opening...especially with the lid on and the OEM hole just enlarged. I think you'd have to submarine the bike in a pretty good water hole or have it fall over and submerge the airbox. And in those cases you're motor is probably running anyway to the point of it not being an issue of how big the hole is...snorkeled or not. I don't think the snorkel on the KLX has as much to do with water as much as it has to do with sound. While there might be a small advantage to water intake in a submerged situation, it will probably only be the small advantage of the smaller hole. A running engine suction is going to vacuum enough water into the box to potentially be a problem anyway IMO...unless you're really fast on the kill switch.
This is why I tend to prefer enlarging the OEM lid opening rather than just run the box without the lid. The bigger hole still gives the engine all the intake volume it needs without presenting a huge opening like the top of a large drinking glass to let potential water spill over the edge. With the lid and a bigger opening, the water will still have to go over a horizontal area to flow into the box. And I think the lid, even with a larger opening, has some sound damping effect on intake noise...like a trumpet with a mute rather than an open end...small, but I notice the difference when you take the top completely off.
This is why I tend to prefer enlarging the OEM lid opening rather than just run the box without the lid. The bigger hole still gives the engine all the intake volume it needs without presenting a huge opening like the top of a large drinking glass to let potential water spill over the edge. With the lid and a bigger opening, the water will still have to go over a horizontal area to flow into the box. And I think the lid, even with a larger opening, has some sound damping effect on intake noise...like a trumpet with a mute rather than an open end...small, but I notice the difference when you take the top completely off.
I agree on the sound damping of the lid based on experience with the 650. It is totally obnoxious to the rider when no lid, okay when no snorkel with lid, and a bit louder when I cut the lid opening bigger. This would have been an idea on the 650 too.
#12
03-31-2014 | 06:21 PM
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From: Land of Fruits and Nuts(Cali)
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It took maybe 15 minutes with a die grinder and carbide tip after i traced the hole. You have to thin a very small area around the lip as you will see on the stock hole, a very simple mod. I hope to give 'er a rip this PM to see what the difference is and it makes we wants to go back up a jet size since airflow was the factor for it not running right at WOT. It ran excellent with the single cutoff 200 snorkle, i just think i can get some more out of her.
#16
04-01-2014 | 02:24 PM
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From: Land of Fruits and Nuts(Cali)
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Im not complaining, we need the water out here...
#18
04-01-2014 | 08:00 PM
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My understanding of intake systems is that unless you're pressurizing at some point that enlarging the intake to any size larger than the narrowest point in the intake isn't going to gain you anything. This isn't strictly true due to things like Bernoulli's law, but much beyond, say, 1.5 times that restriction you'll gain nothing if flow.
If you are, for example, sucking through a straw it doesn't matter if you open the door if the room you're standing in. It just won't get any easier to suck though the straw.
A sealed rigid airbox can also act as a resonating chamber and boost intake at some RMP and throttle opening in the same way that a guitar will amplify the sound of strings.
People often think that the bike makes more power because it's louder and they expect it to make more power.
If you are, for example, sucking through a straw it doesn't matter if you open the door if the room you're standing in. It just won't get any easier to suck though the straw.
A sealed rigid airbox can also act as a resonating chamber and boost intake at some RMP and throttle opening in the same way that a guitar will amplify the sound of strings.
People often think that the bike makes more power because it's louder and they expect it to make more power.
#19
04-01-2014 | 10:08 PM
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Joined: Jan 2013
Posts: 1,422
From: Las Vegas, NV
My understanding of intake systems is that unless you're pressurizing at some point that enlarging the intake to any size larger than the narrowest point in the intake isn't going to gain you anything. This isn't strictly true due to things like Bernoulli's law, but much beyond, say, 1.5 times that restriction you'll gain nothing if flow.
If you are, for example, sucking through a straw it doesn't matter if you open the door if the room you're standing in. It just won't get any easier to suck though the straw.
A sealed rigid airbox can also act as a resonating chamber and boost intake at some RMP and throttle opening in the same way that a guitar will amplify the sound of strings.
People often think that the bike makes more power because it's louder and they expect it to make more power.
If you are, for example, sucking through a straw it doesn't matter if you open the door if the room you're standing in. It just won't get any easier to suck though the straw.
A sealed rigid airbox can also act as a resonating chamber and boost intake at some RMP and throttle opening in the same way that a guitar will amplify the sound of strings.
People often think that the bike makes more power because it's louder and they expect it to make more power.
#20
04-02-2014 | 04:18 PM
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Joined: Jun 2008
Posts: 1,360
From: So Cal
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It's a motorcycle it's supposed to make noises. Intake noise bothering you? You need to upgrade the exhaust or twist it more!
It's music to my ears... I know she's breathing well. I'd rather have the extra oomph. But yeah there's no deep water crossings around here
It's music to my ears... I know she's breathing well. I'd rather have the extra oomph. But yeah there's no deep water crossings around here