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Old 09-19-2013, 03:20 AM   #1
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Wow, what a difference in air filters....

I change my air filters every 2 years for smog tests (no matter what the mileage, 12,000 miles this time)


Anyway, the last filter was a Fram.

This time I used a Purolator. I tend to get what's on sale at the time.




The Purolator filter has at least twice the pleats of the Fram air filter..........


So if you need more filtering capacity, use the Purolator over the Fram..


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Old 09-20-2013, 10:23 AM   #2
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Thanks for the info. In general usually anything is better than Fram. There are some applications where fram is acceptable but its usually gotten because its cheap, but there is a reason for its ultra low costs.
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Old 09-20-2013, 10:36 AM   #3
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We just replaced the air filter in my girlfriends 01 ZX3 with a Fram filter. She just got it a couple months ago and we're catching up on any maintenance the PO might have missed. I tried to convince her to go with the K&N drop in (or even an intake) but she got the Fram because of the cost. Didn't make any difference compared to the dirty one in it, but she doesn't do performance mods and just wants the car to be up to speed maintenance wise so I understand why she went with Fram.
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Old 09-20-2013, 10:46 AM   #4
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^^ if it made no difference then she wasted the money on the fram. The prolator is by no means a performance filter. however nice filters have more pleats and thus more surface area because there is more material. So the engine is able to breather easier. this can be for performance but also can mean a small increase in fuel economy for the "normal" / casual driver.
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Old 09-23-2013, 12:31 AM   #5
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Drop in filters all have the same surface area when it comes to cfm. More pleats does not mean more air flow. More pleats means more surface area to trap dirt which can allow the filter to breathe easier as it gets older. The only way to get more cfm out of just the filter itself is to increase the dimensions of the filter. That's why most cone filters flow better is due to more dimensional surface area(not pleats). My Steeda sri cone filter has almost twice the surface area of the stock filter. When I put it on my Kona low end was about the same but I could feel quite a difference above 3500k rpm over my drop in k&n filter.
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Old 09-23-2013, 11:01 AM   #6
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^^ you say more pleats equals more surface area. I think I have discussed this before but cant recall. The more pleats you have the more surface area you have. While you are not changing the flow characteristics of the tube or the air box, you are changing the seen surface area within the pipe. there should be less pressure differential between the two sides which means it should flow more. and with more pleats it should also be able to capture the dirt with less impact on performance.

I am no air filter expert but that is my logic.
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Old 09-23-2013, 04:54 PM   #7
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Your logic is sound. More pleats=more surface area=more filtering capacity.

It won't necessarily flow better, however, because flow is a factor that is also dependent on the restrictive qualities of the filtering media.

Quote:
Originally Posted by Blue5ive View Post
Drop in filters all have the same surface area when it comes to cfm.
I'm not sure what you're trying to say here, but not all drop-ins have the same surface area or the same amount of restriction...

Quote:
Originally Posted by Blue5ive View Post
The only way to get more cfm out of just the filter itself is to increase the dimensions of the filter.
This is not true. Changing the media to freer-flowing will also increase flow and reduce restriction. However, that change will nearly always be a detriment to filtering efficiency.
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Old 09-23-2013, 05:00 PM   #8
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Quote:
Originally Posted by TboneZX3 View Post
Your logic is sound. More pleats=more surface area=more filtering capacity.

It won't necessarily flow better, however, because flow is a factor that is also dependent on the restrictive qualities of the filter media material.



I'm not sure what you're trying to say here, but not all drop-ins have the same surface area or the same amount of restriction...

All drop in fikters of the same physical size; say 7x9, have the same physical dimensions therefore same potential flow


This is not true. Changing the media to freer-flowing will increase flow and reduce restriction. However, that change will nearly always be to a detriment to filtering efficiency.
Was not refering to the media itself.
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Old 09-23-2013, 05:17 PM   #9
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More pleats typically means more surface area, which means increased flow. Take two dimensionally-identical filters (outer dimension of drop-in frame) with the same media, and they will perform differently depending on the surface area of the media. The more surface area of media there is within that dimension, the media will create less of a pressure drop across the filter. This becomes increasingly important over time, as the filter with less surface area will load up quicker as it becomes dirty. If you have more pleats of the same size in one filter than another, that filter will have more surface area, and thus will promote increased flow. I agree that having more pleats doesn't necessarily mean more surface area (due to the size or depth of the pleats), but typically it does.

I think we're virtually saying the same thing here, I just don't understand this part:

Quote:
Originally Posted by Blue5ive
That's why most cone filters flow better is due to more dimensional surface area(not pleats) My Steeda sri cone filter has almost twice the surface area of the stock filter.
If your SRI cone filter had fewer pleats of the same size, it would not flow as well due to lower surface area, so pleats are a consideration.
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Old 09-23-2013, 07:20 PM   #10
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More pleats only aid in filtration because you are putting more material in the same space(Using material with the same flow characteristics). More pleats will yeild better flow as the filter gets really dirty since the one with fewer pleats will start to become more restricted sooner. But too many pleats can can cause restriction in itself compared to a filter with fewer pleats because the fitler media itself is a restriction. So its all a balance. If 2 filters of the same exact material and size with same exact permeability and filtering charcteristics are compared the one with fewer pleats will flow more in the beginning than the higher pleat count. Then at a certain point as the filter becomes more obstructed with dirt the higher pleat count will then take the lead and perform better.

When air is being pulled through an opening only 3 things will get you more air. Higher velocity(cfm), higher density which is usually determined by temp and humidity and decreased restriction at the opening.
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