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Post by stupotads on Jul 31, 2011 13:19:00 GMT 1
Has any body fitted a K & N Air Filter ? If so, does it make any difference to the running / economy etc ?
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Post by De Graaf van Salland on Jul 31, 2011 20:28:15 GMT 1
I know that these filters are very popular over here (in the Netherlands), but I'm not a fan of them.
First of all, your bike will make a lot more noise.
And I don't think these filters filter out the fine particles in the air so well.
They are, after all, made of a fine mesh (metal) and the holes in there are always quite a bit larger than the micro-holes in a paper-based filter (which is the original filter).
GvS
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Post by skyhook on Jul 31, 2011 21:20:08 GMT 1
Yes fitted 1 to mine a cpl years back. Sure they make more nosie, but am sure there was more power also. As for MPG cant say as I did not run it long enough to make a dif. Easy to clean as long as you use the right stuff. I run 1 in my yam 900F and am getting better MPG than some yams on Fuelly, and yes even tho she is 21 years old she can still do the top end  ( on a private track that is  ) |
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Post by gothitjulie on Jul 31, 2011 22:24:17 GMT 1
I run K&N type cone filters on my Lario, can't hear them due to exhaust roar anyway so I guess they're OK.
With the mesh cone filters you have to spray the mesh with a special filter oil to make them effective. This needs cleaning off & reapplying occasionally. A tin of the filter oil spray will last you many many decades (mine probably still has CFCs in it it's so old).
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wolfy
Bad ass biker
Posts: 286
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Post by wolfy on Aug 1, 2011 9:46:26 GMT 1
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Post by rj2para (Bisto) on Aug 1, 2011 20:03:24 GMT 1
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Post by gothitjulie on Aug 1, 2011 20:05:40 GMT 1
Extend the oil breather pipe & route down the back of the engine & let the vapour go to the road.
Or, route it back along the bike & angle the end up to spray it into cagers windscreens ;D
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Post by rj2para (Bisto) on Aug 2, 2011 20:40:10 GMT 1
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wolfy
Bad ass biker
Posts: 286
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Post by wolfy on Aug 3, 2011 15:15:15 GMT 1
Thanks for all the info! Not sure if I was clear I'm on the NTV600 (Revere) - those links specify the 650, so I'm still not sure. Anyway, I like the look of the conical ones so I think I'll give those a go, I've got some spare fuel hose I can use to re-route the oil breather, just need to dig out a few cable ties and I've got all I need |
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Post by rj2para (Bisto) on Aug 3, 2011 18:56:49 GMT 1
I am also on the Revere. Not had them side by side but the air boxes look very similar 600 / 650. The air intake looks a little longer on the 650.
I tried looking on the web for another pic I have seen with the cones pointing out and forward either side of the frame. I only saw a pic with the tank on, but I guess there was some kind of pipework routing going on the join the filters to the carbs.
A mate is doing a variation of the pipe extension on his Subaru routing it to the rear of one of his fog lamps. Hence I suspect the reason for the cones external to get cooler air.
If you try it, can we have lots of pics please. It sounds like an interesting project.
Rj.
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wolfy
Bad ass biker
Posts: 286
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Post by wolfy on Aug 5, 2011 16:03:10 GMT 1
Th econes have been dispatched! Yes I will take piccies. The only potential problem is that they may be designed to go straight on to the carb inlet rather than the existing rubber which connects to the airbox in the standard configuration. This would mean I would have to get a bit creative as the rubber is where the 33bhp restrictor washers reside But fortunately, I have a spare set of the rubbers so a cut-down version to house the washer *and* give sufficient clearance in case the cones foul the tank, may be a possibility. You've got to have a go, haven't you? |
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Post by rj2para (Bisto) on Aug 5, 2011 20:08:23 GMT 1
Time for the old man hat to come out With the K&N filters I assume this would put back up over 33 BHP? If so you have legal issues? Does adding a K7N filter equate to an engine mod? As it changes your engines power, probably yes, so it may effect your insurance and would probably invalidate it if you don't tell them. Tempted to say check it out first. Sorry poor cold water on what I think is 'technically' and interesting mod. Ride Safe Rj. |
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wolfy
Bad ass biker
Posts: 286
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Post by wolfy on Aug 6, 2011 8:15:38 GMT 1
I'm with you on that - I've researched and I'd expect about 3bhp increase at the very most if the bike was unrestricted. I would expect a few of the original 55 horses to have 'escaped' in the past 22 years, but I am going to have it dyno'd anyway. In the event it's over 33bhp I'll have to swap back to the original airbox and work out a way of reducing the power slightly. And yes I'd regard it as modification so I will be informing my insurance company accordingly - they're cool with that.
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wolfy
Bad ass biker
Posts: 286
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Post by wolfy on Aug 6, 2011 9:05:12 GMT 1
Interestingly, having done some more research this morning, I reckon the NTV at a rough stretch would manage to make a few bhp with these filters but, and here's the but, only if they get nice cold air coming to them, hence people having them outside or at the end of a ram air intake. Bearing in mind the position of them on the NTV i.e. under the tank immediately over the engine, they won't be getting much cold air so may even lose power. It'll be interesting to see, I've dug out the number of MK Dyno (in Milton Keynes...) and if they don't charge too much I'll have a before run as well.
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wolfy
Bad ass biker
Posts: 286
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Post by wolfy on Sept 3, 2011 18:53:39 GMT 1
First of all, your bike will make a lot more noise. No kidding!! I fitted them this morning and went for an experimental ride. The induction noise is immediately very loud and very very annoying indeed. I went straight back home and but the stock airbox back on before going for a proper ride with it as the designers intended. So, that's two good-sounding ideas proven to be dead-ends this weekend! I think I'll leave fitting the LED indicators until next weekend in case that turns out to be a poor idea |
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( on a private track that is 
)
