K&N Cone Filter - BMW Forum

breakpopin · 02-28-2004, 08:34 PM

Yo guys,
A cone K&N filter was given to me by a friend. Its size is huge, the diameter of the opening is 6". DOes the size of the opening (or the filter itself) affects how the car performs? Eg. Small litre cars should use smaller filters whereas bigger capacity cars should use bigger ones.

So can my E36 318i M40B18 use this filter without problem? Or is it too big for me engine?

bimmerfan620 · 02-28-2004, 09:03 PM

The size of the filter means nothing if you can fit it properly.. The larger the better as long as you can insert the correct piping inside it without a leak. When speaking of Intakes on cars, The larger the intake, the better. This basically means that your engine will have that much more filtered air being drawn in with less restriction than if you had a smaller diameter filter. I would use the filter if you can fit it and it is in good condition.

ps - K & N filters are awsome. You can get the refill kit which has the cleaner and the new compressed K & N red oil to spray over the cleaned filter... GREAT filteration and performance gains over cheap knock-offs.

breakpopin · 02-28-2004, 10:12 PM

hey thanks.. so what u mean that the bigger the filter is the better its just as long as i can fit it to my (hold) it to my air flow meter? I was told by someone that my engine (M40B18 1.8L) does not have enough power to suck in air from such a big filter.

here is the picture of my K&N..

bimmerfan620 · 02-28-2004, 10:15 PM

whoever told you your car doesn't have enough power to suck in air from that filter is crazy. You could remove your entire Air/Intake from the throttle body to the filter and you would get KRAZZZZZY throttle response and see a difference in power except for the heat factor.... any car will benefit from a larger filter..... Bottom line, your piping is all the same size, the filter is only allowing more air from all directions to be drawn in faster and with ease..

breakpopin · 02-28-2004, 10:28 PM

Oh Great man! now i can get it fitted soon..! i haf to get the refill kit as well..

hmm, is it important to make a heat shield out of it?

bimmerfan620 · 02-28-2004, 10:37 PM

I would make a heat shield if I was you..

1. It will really help keep the dust from the fan out of the filter
2. does a lot to keep the fan from blowing radiated heat and air into
the filter as well
3. JUST DO IT! - like the NIKE commercials... heh

no, but I would try and find some Aluminum sheets at say, Home Depot, down the Concrete/Roofing materials Isle, (don't know why I know that), and try and form your curves as smooth as possible, while cutting your angles with tin snips. The aluminum is easy to bend, just don't screw it up by going to fast, and after you cut the surroundings to fit the form, you should get some rubber moldings to cover the sharp edges and to seal the shield...

do you understand the directions? or do you need more help?

ps-it's definitely worth putting up a shield..

breakpopin · 02-28-2004, 10:55 PM

heh, trying to understand the work.. hm, do you have a picture of how the heatshield you mentioned look like?

bimmerfan620 · 02-28-2004, 11:13 PM

^^ this is a hackjob style made out of ABS plastic.... ^^

^^ This one is a Racing Dynamics, made by the shop, but there's no reason you couldn't make yours look as good as long as you make your bends correctly using something to mold the aluminum around...

ps- check the rubber seals that are used on the bottoms and the tops to seal the intake off from the rest of the engine bay..

breakpopin · 02-28-2004, 11:21 PM

ah,,, i get the idea.. thank you very much dude!.. will start my project soon! hahhaa..

cheers!

Andrewsd1985 · 02-28-2004, 11:41 PM

That first one is os ghetto rigged, who's is that? You definetley want the heat shield. I'm, pretty sure some others in here have made their own.

bitcore · 02-29-2004, 10:07 AM

Is the racing dynamics a CAI? I think I seemolded plastic that may have cut into the brake duct but im not sure.

bimmerfan620 · 02-29-2004, 10:18 AM

the racing dynamics doesn't have any peices lower than the filter. Their kit only comes with the shielding and rubber moldings to meet with the hood. Other than that it's up to the person to add more.. But It's supposed to help out a good amount..

bitcore · 02-29-2004, 10:22 AM

You think making it CAI would make it any better? What about putting a freaking heat exchanger hooked up to a 2nd compressor to further cool the air? That'd also de-moistureize alot of the air from dehumidification wouldn't it? Am I blabing like an iditot or would any of this help? (compressor would put a load on the engine but mabe the REALLY cold air could overcome that?)

Mattitjah · 02-29-2004, 12:54 PM

Quote:

Originally posted by bitcore@Feb 29 2004, 12:02 PM
You think making it CAI would make it any better? What about putting a freaking heat exchanger hooked up to a 2nd compressor to further cool the air? That'd also de-moistureize alot of the air from dehumidification wouldn't it? Am I blabing like an iditot or would any of this help? (compressor would put a load on the engine but mabe the REALLY cold air could overcome that?)

Nah, it would be better to ad a nitrous cooled intercooler sys. but since we are on this path you might as well go all the way and get a turbo or supercharger sys.

breakpopin · 03-01-2004, 02:01 AM

ah, just finished the first step of washing my K&N filter. Man, the liquid cleaner stinks! (soda powder?).. but the effect was great, all the black dirt just came off after i rinsed it with water. Now the filter looks much better..!! gonna re-oil it later. Any tips and tricks to do this? as i know that too much oil is bad.. how should i apply the oil then?