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Old 09-19-2002, 05:25 AM
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Post K&N top filter thingies

I ment to ask about the K&N top filters as well. The filter that replaces the top of you air cleaner. Any one have any practial use results on these? I have so much room under my hood i could stack two regular filters under there and have plenty of clearance left.I am allways looking for ways to get more power and ecconmey. What do you think of theses filters? Thanks again. And what about ram air for street truck? Is it worth it?
Slider in Wa.

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Old 09-19-2002, 05:52 AM
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I've never used K&N but evrything I've seen they're really good compared to Fram and other types.I'm not sure if I understand you correctly but the more surface area you have for air intake the greater amount of air will enter the carb, to a certain point.

I'm not sure how you could figure the maximum amount of air flow the carb will handle vs the air filter.

I hope that wasn't too confusing.
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Old 09-19-2002, 06:42 AM
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If you can stack elements (I think they also make double height elements also) that would be the way I would go. The top filter thingies are expensive, something like $65.
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Old 09-19-2002, 06:57 AM
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There is an air filter that is about 4" tall that is used on early model chev. trucks. I use one on my truck, it's stock size. I'm not sure if K&N has one that size. I've seen the ones from K&N that actually flow air from the sides and top of the filter. They are expensive !!
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Old 09-19-2002, 12:33 PM
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keep in mind that a clean 14x3 K&N filter will flow 800cfm. (the box says so) if you have a 600 or 750cfm carb it simply will do no good. Even though those tops are supposed to flow an additional 1000cfm or something, it going to be kind of a waste of money if your engine doesnt even use all that air.
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Old 09-19-2002, 02:56 PM
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Those are the kind of answer i was after. They all make sense.Thanks guys.
Slider in Wa.
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Old 09-19-2002, 02:56 PM
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agreed. my k&n is 14" x 3&3/4" and is more than enough. i'd go pull it and give you a part # but for some reason it seems to be raining.
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Old 09-19-2002, 05:51 PM
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I have the K and N Flow Control Air cleaner system that I paid $130.00 for. They claim a 15 to 17 horsepower increase on a 340 engine. I know what a 15 horsepower increase feals like and this was not it. I would estimate it to be more like a 5 to 8 horsepower increase. If you are driving the car on the street, its not worth the money, in my opinion. If you go to the drag strip where a tenth of a second can make the difference, I would get it.
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Old 09-19-2002, 06:33 PM
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Or if it looks right in your engine compartment. Personally I prefer the look of simple chrome filter housings, especially if you ain't gonna get a big boost from the filter top thingy. But every little bit helps I suppose.

I bet you could make something similar with a little work and hacking at the top of your filter lid. Say cut sections out and put in pieces from a regular filter. Even if it doesn't flow great, it would have to flow better than stock. For cheap too. If you had some skills it would probably look ok. I may try that with my wagon(if the deal ever goes through) for ****s and giggles.
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Old 09-19-2002, 07:58 PM
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So i could cut up my chrome top filter thingy and make it like a turbulator too!!!!!!!!!!!!
Ya know somebody has got to be the goat and ask this stuff every now and then. I`ll go with the taller filter and leave it alone.
Bulleimer, I just looked out the window and still no rain yet!!!! Lets hear it for the dry side of Washington State. As a matter of fact gonna ride the Harley camping this week end.
Thanks you guys.
Slider in Wa.
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Old 09-20-2002, 10:54 AM
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K7N filters have been around for many years in the sports car race business. They were originally a replacement for no filter and were attractive because they can be washed, oiled and re-used after each race. I doubt that they really add anything to the power picture when you have an oversized filter on a carburetor with limited breathing capacity below the flow rate of the filter.
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Old 09-20-2002, 01:54 PM
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My friend put one of the "Xtreme" tops on his turbocharged 327 and it gave him more boost!!
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Old 09-22-2002, 05:29 AM
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I saw them put a k & n filter on a car on , "More Horsepower" t.v. some time back seemed like it was supposed to make a difference. My oldest has one on his Camaro but he said he didn't really notice any difference in performance. But, you never have to buy another filter for a very long time. He also says (he's a mechanic) some cars already have the terbinator effect built in so the additional turbinator they sell on t.v is a waste of money. I'm more like you slider. I look for ways to run more horsepower without making the car use 5 mi to the gallon. economy and horsepower dosen't happen together very often.
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Old 09-22-2002, 02:03 PM
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I would guess the extra cfm capability would be handy as the filter accumulates dirt, that from what I understand, is what makes them good for muddin or racin........but you wont find a dirty filter under the hood of a rodders ride!! <img src="graemlins/nono.gif" border="0" alt="[nono]" />

[ September 22, 2002: Message edited by: 72 chevy ]</p>
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