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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford SVT Raptor General Discussions [GEN 1]
"Wet" vs "Dry" Filter elements
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<blockquote data-quote="MarkT" data-source="post: 86974" data-attributes="member: 3007"><p>Hey Brian... we have similar backgrounds with dirt bikes... except I remember the days when they came with PAPER filters!</p><p></p><p>Here's the history of the "oiled filter" in regards to dirt bikes as I lived it:</p><p></p><p>Paper filters were the standard in the early days of motocross bikes. But there was a problem. If a paper filter got wet, if it didn't tear, it swelled up and no more air would flow. Even if it dried out, it was damaged would not flow properly. But paper filters did keep the dirt out!</p><p></p><p>Most dirt bikes in the 1960's were two strokes of the "piston port" design... without boring you with the details of operation, the result was that at low rpm a LOT of the air/fuel/oil mixture was spit back through the carburetor... </p><p></p><p>In those days, the foam rubber available would be attacked by oil... and the fog of fuel made things even worse. The foam would break down over time and the filter would become very restrictive. </p><p></p><p>In the late 60's, K&N in Riverside, CA came up with the "oiled gauze" idea for two-stroke off road dirt bikes... Gauze did not break down like the foam of the day, flowed a lot of air, and wasn't affected by getting wet... oiled gauze did not filter as well as paper in those days... but it was a great option in the day.</p><p></p><p>In the early 70's, new kinds of foam were available and most bikes had some sort of oiled foam filter. But you still had to replace the foam filter every year or two. Some brands would literally disintegrate if washed in strong solvent or even gasoline. K&N's were better in this respect as well. </p><p></p><p>As I remember it, the paper filter was the best when it came to filtering. But paper wasn't great on motorcycles used off road in wet conditions... and the "spit back" through the carb didn't help either.</p><p></p><p>I've used K&N filters off road for years... decent filter. But they do let some of the fine silt through especially when new. (A K&N actually filters better when dirty... as long as you don't let it dry out.) I usually used a K&N with a foam prefilter... </p><p></p><p>As has been mentioned, "paper" filters have come a long way. The quality ones are now made out of synthetic materials and are a good choice in my opinion... especially when it comes to keeping the dirt out. (some "paper" filters... like the one in the Raptor... are even "oiled".)</p></blockquote><p></p>
[QUOTE="MarkT, post: 86974, member: 3007"] Hey Brian... we have similar backgrounds with dirt bikes... except I remember the days when they came with PAPER filters! Here's the history of the "oiled filter" in regards to dirt bikes as I lived it: Paper filters were the standard in the early days of motocross bikes. But there was a problem. If a paper filter got wet, if it didn't tear, it swelled up and no more air would flow. Even if it dried out, it was damaged would not flow properly. But paper filters did keep the dirt out! Most dirt bikes in the 1960's were two strokes of the "piston port" design... without boring you with the details of operation, the result was that at low rpm a LOT of the air/fuel/oil mixture was spit back through the carburetor... In those days, the foam rubber available would be attacked by oil... and the fog of fuel made things even worse. The foam would break down over time and the filter would become very restrictive. In the late 60's, K&N in Riverside, CA came up with the "oiled gauze" idea for two-stroke off road dirt bikes... Gauze did not break down like the foam of the day, flowed a lot of air, and wasn't affected by getting wet... oiled gauze did not filter as well as paper in those days... but it was a great option in the day. In the early 70's, new kinds of foam were available and most bikes had some sort of oiled foam filter. But you still had to replace the foam filter every year or two. Some brands would literally disintegrate if washed in strong solvent or even gasoline. K&N's were better in this respect as well. As I remember it, the paper filter was the best when it came to filtering. But paper wasn't great on motorcycles used off road in wet conditions... and the "spit back" through the carb didn't help either. I've used K&N filters off road for years... decent filter. But they do let some of the fine silt through especially when new. (A K&N actually filters better when dirty... as long as you don't let it dry out.) I usually used a K&N with a foam prefilter... As has been mentioned, "paper" filters have come a long way. The quality ones are now made out of synthetic materials and are a good choice in my opinion... especially when it comes to keeping the dirt out. (some "paper" filters... like the one in the Raptor... are even "oiled".) [/QUOTE]
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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford SVT Raptor General Discussions [GEN 1]
"Wet" vs "Dry" Filter elements
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