I agree Chris. I have to change the cover on my 6637 and the dirt seems to be even all over the cover. I can take a pic before I change it.

 

Duplicate post

 

Equation # 6637


Stock or improperly sealed K&N could result in:



6637/AIS/AFE =




It's your choice, pic your poison......

It's your monkey, spank it the way you want to.......

 

This turbo protected by the stock airfilter looks quite apealing as well:

 

Running the 6637 will turn my stock compressor housing into a ported shroud housing?

You've just converted me to a 6637 user.

 

It's quite the amazing mod isn't it..........

I think the ported housing comes with Pete's covers.

 

If I had known that I would have bought a cover a long time ago.

They really are a bargain.

 

I'm not trying to get in your face here because as I'll explain below I've tried to do the analysis suggested above and there're so many unknowns that any given OA report means very little if anything at all about your air filter's "Dirt Filtering Efficiency" and its "Dirt Holding Capacity"!

For an ISO-5011 test the "Dirt Filtering Efficiency" is given by...

"Dirt Filtering Efficiency"={"Dirt Holding Capacity"}/{"Dirt Holding Capacity"+"Dirt Passed"}

Here's a summary for the 4 filters tested and filter #2) is the stock FA-1750 filter.

...............Filter Tested.......#1)...........#2)...........#3)...... ......#4)
..............."Dirt Passed"......0.33..........1.31...........4.70.... .......6.72..grams
..."Dirt Holding Capacity"....107.0.........542.0..........66.9.... ......136.1..grams
"Dirt Filtering Efficiency"....99.69%.......99.76%......93.44%.... ...95.29%

#1) Efficiency={107.0}/{0.33+107.0}=0.9969=99.69%
#2) Efficiency={542.0}/{1.31+542.0}=0.9976=99.76%
#3) Efficiency={66.9}/{4.70+66.9}=....0.9344=93.44%
#4) Efficiency={136.1}/{6.72+136.1}=0.9529=95.29%

As can be seen in the above table the "Dirt Filtering Efficiency" gives the percentage of dirt that's stopped by the filter so that it doesn't enter the engine. As a "thought experiment" lets try to use OA to measure an air filter's "Dirt Filtering Efficiency" by administrating an ISO-5011 test which feeds standardized dust into the intake of an engine running at full HP on a load dyno.

We start the test with new oil and a new oil filter. So now instead of being trapped in the ISO-5011 suction chamber for analysis the dust that's passed by the air filter is ingested by the engine during the intake strokes but most of this passed dust goes right back out during the exhaust strokes!

However a small but completely unknown percentage of the passed dust does make its way past the piston rings and begins to accumulate in the 4 gallon oil reservoir. But now for each pass of the 4 gallons of oil through the high efficiency oil filter a large but completely unknown percentage of the passed dust that did make its way past the piston rings gets filtered out by the oil filter and a small but unknown percentage remains in the general 4 gallon oil reservoir.

So now at the end of the test you do an OA but how can you use the ppm Silicon from this OA report to calculate how much dust passed through the air filter? Since "standardized dust" was used in the test you could determine how much Silicon was in each gram of test dust but how do you account for the unknown percentage of dust that passed through the air filter and right out the exhaust? How do you account for the unknown percentage of dust that was removed from the 4 gallon oil reservoir by the oil filter?

In the real world Silicon makes up about 25% of the earth's crust by weight but in some operating environments such as cities most of the particulate matter in the air isn't Silicon based so in these environments you might even get an acceptable ppm Silicon from an OA report without using any air filter at all!

 

You are correct. UOA does not in any way measure a given filters "Dirt Filtering Efficiency" and its "Dirt Holding Capacity". Silicon level on a UOA is not meant to compare against an ISO or ASTM test. That would be like using a $20 UOA to determine oil meeting specifications. Oil analyis is a snapshop of a given sample and meant to be used to gather historical data and establish trends for a specific application.

But is sure does give you an indication when something is working better or worse for a specific application.

If you could drop your silicon levels by 50-75% by simply changeing to a different air intake system......that's a good thing. No matter what part of the Earth's crust you are occupying.

 

I'm getting ready to hit the road again but if you want I'll give some equations backed up by independent testing to prove that your thinking is incorrect!

 

Gene... I get no response to my apology and offer to work with you on the filtration project?

 

I just sifted through this thread and I'm not sure if the original poster had his question answered. Here's a very straight-forward, cut and dry answer without anecdotes...

The mod is a no brainer. Get yourself a 4" long section of 4" exhaust pipe. Get stainless steel if you're so inclined. Get youself a tubing clamp suitable for 4" to 4.5" diameter tubing from Home Depot or Lowes. Get yourself a 6637 filter.

Install is pretty easy. Just have a good look at the whole clip/locking system the air box, battery box and ram air tube utilize. Start taking it apart and remove the battery. Once you remove the air filter box, you can try to fit your 6637 in the void. I had to do some cutting for the filter to sit in the void nice and flat and so the hood would close. You'll notice that the IAT sensor needs to be relocated. I opted not to install it in the end of my 6637 and zip tied it to a brake line behind (towards the firewall) the filter.

Here's the void after I cut and rasped all edges nice and smooth:


Here's the 6637 installed:



I did not do the foil delete. The foil appears to be an insulation, so I left it. I hope this helps.

 

Well before you posted your "apology" I asked you to answer the question below so I can continue my analysis of your filter cover but you've never answered it!

I've also posted several interesting technical issues regarding testing an "open element" filter to ISO-5011 standards and then applying those test results to real world installations and you haven't responded to those issues unlike others who have?

Now regarding your so-called "apology" below...

I've probably posted more than 100,000 words (including equations) on FTE and there's not a single "careless" remark in the bunch because unlike a lot of members who seem to give advice in a somewhat haphazard "***** nilly" manner I make sure I adhere to the "Hippocratic oath" of not giving any recommendations that might do harm to other member's trucks!

Please quote back to me some examples to back up your accusation of my "carelessness" because "carelessness" is probably the second worst sin a Ph D can commit!

1) Quote back to me our "differences" and I'll try to resolve them!

2) I'm "not always right " but the few times I've been proven wrong I've immediately posted a "bold face capitalized retraction" and I'll put my track record of being right up against anyone's!

3) I most certainly won't accept your "terms for continuing to pursue and participate in this filtration project" nor will I ever accept any terms for participation on this forum other than the ones I accepted when I registered on this site!

 

I would be interested in these equations.. Be safe on the road!

 

Gene the man offered an apology. Why can't it just be accepted?