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ttr250dude

Twin Air filters

6 posts in this topic

After I bought mine, the first thing I noticed was more dead space in my wallet..... :rant:

Seriously, TwinAirs are decent filters. I've used 'em on several bikes I've owned previously, and always have been happy with 'em. But I'm not certain that they actually help the engine breath any better due to a little more room in the air box (especially after I over-oil it anyway..... :lol::p ) But they are a little easier to get that sticky, oily sponge in position in the airbox.... :smirk:

Honestly, my bike makes more juice than I can use most of the time, so my "Butt Dynomometer" probably won't even notice it..... :p

JImmie

Edited by Diesel Goober
It just needed to be edited....

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I believe the theory is it can pull more air since there is more available air around the surface of the filter as opossed to pulling it from outside the air box. Perhaps its more for marketing and sounds good in an ad. Does it really work? I have no idea. I don't think twin airs are known for being a performance upgrade but they are high quality and sure do filter well.

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If the OEM filter is small enough that it creates a significant restriction to air flow, a larger element will reduce that restriction, and should add "some" power. If it's not small enough to cause trouble, making it bigger won't do anything except keep it from clogging so fast. But in some conditions, that could be a performance boost, too.

You can do a fairly scientific test for this by rigging a slack tube manometer with the signal end of the tube just under the filter element. Be sure to have a good long tube for the water loop, as it takes 13.6 inches of water to equate to an inch of mercury. Watch the tube (and where you're going) as you roll open the throttle to full under a load. If there is more than a 12 in/H₂O depression under the filter, it can probably be improved enough by a larger element to show results on a dyno.

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If the OEM filter is small enough that it creates a significant restriction to air flow, a larger element will reduce that restriction, and should add "some" power. If it's not small enough to cause trouble, making it bigger won't do anything except keep it from clogging so fast. But in some conditions, that could be a performance boost, too.

The Twin Air filters are slightly smaller than stock. I'm pretty sure when i got my bike it had the stock filter. It filled the air box pretty good and didnt leave much extra room.

Pics of my old filter compared to my Twin Air:

http://www.thumpertalk.com/forum/showthread.php?t=955783&highlight=

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the real benefit to the twinair filters is that they don't fall apart after 5 cleanings like my oems and uni's did.

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