capt.Ron

I'm looking at Amsoil filters and have some questions.
How elastic are the flanges on these filters?
The reason I ask is that I'm considering the EaAU4091, which has a 4" (I.D.)flange. Will it stretch around a piece 4" (I.D.) exhaust pipe. My plan is to take a small section of pipe and plug it into the OEM inlet tube. The reason why I want this filter over the EaAU4510 is the offset flange.
My next question requires someone who really understands geometry.........well at least better than me!
The 4091 is 2" shorter but larger at the base and top O.D.
So if anyone here knows how to calculate the total surface area of an oval cone shaped object jump right in and be my brains for me.
Below are the specs for each filter:
Amsoil Number EaAU4091
K&N Number RC-5102
Product Style Oval Tapered
Base OD 9.5" X 6.75"
Top OD 9.00" X 5.5"
Media Height 8.938"
Flange ID 4"
Flange Length 1.875”
Flange Type Off Set


Amsoil Number EaAU4510
K&N Number RF-1024
Product Style - Oval Tapered
Base OD 9.25" X 6.25"
Top OD 7" X 4.5"
Media Height 10"
Flange ID 4.5”
Flange Length .625”
Flange Type Centered
Below is a link to a pdf of the filters that Amsoil sells and their specs.
Below that is a chart emailed to me from amsoil that lists the CFM specs of 3 filters at various "inches of water" (vacuum), one being the 4510.
What I'd like to know is what the CFM of the 4091.
http://www.amsoil.com/products/ea_fi..._and_specs.pdf

sheriffav8r

Now I hate math, mind you, but I did sleep at a holiday inn express last night:

Surface area of a truncated cone is as follows:

Actually, never mind; simply use your filter 4091 as a simple elongated oval filter (average the top to bottom cone shape to make a straight up and down filter instead of a cone; that's where the guessing comes in). Separate the cone into a circular cone (both ends joined together) and two halves of a box (the flat area). Average from top to bottom is 6.125" x 9.25" so figure out the general area as (big guess here since you don't know the diameter of the filter): make the filter round= 6.125" diameter and subtract it from 9.25" to get the flat length of 3.125". Multiply that twice for each side = 6.25" flat area plus the circle diameter of 6.125" for a piD circumference distance of 19.24 inches. 19.24 + 6.25 = about a 25.5" filter diameter. 25.5"x8.938" filter height = 228 square inches of filter area.

The truncated cone oval of the 4510 (after running the same crap up top)=
8.125" average length and 5.375" average width. 5.375" average circle diameter plus 8.125-5.375x2=5.5 square length. 5.375" diameter times pi = 16.88" plus flat length of 5.5" = 22.38" filter diamteter. 22.38"x10" height = 224 square inches of filter.

The 4091 has 4 more square inches of surface area than the 4510 or about 2% more.

Q.E.D.



P.S. Keep in mind, I had to take calculus three times to get a "C." Also, I've been known to be full of crap at times....

capt.Ron

Well at least you're full of crap enough to try!!
Thanks for the help.....We can always count on our MARINES!!

high bid

Make sure to let us know how much HP you gain w/2% more added filter surface area.

capt.Ron

Well considering that I'm going from the K&N drop in to the Amsoil 4091 I'm pretty sure the added surface area will be much more than 2%.

torqmonster

subsrcribed

high bid

True....j/k w/ya.
Yes, I ran the K&N drop in filter and changed to the Amsoil which was an improvement both on airflow and the fact no more oil is being drawn into the turbo from the K&N.

capt.Ron

NP. Figured ya was.
So how elastic are the flanges on the Amsoil filter?
The 4091 is 4" I.D. and the 4510 is 4.5".
I need to stretch the 4" flange around a 4" I.D. pipe.

high bid

I don't believe you will be able to "stretch" the filter flange out enough to work. Keep it simple and go off the I.D. of your rubber turbo intake tube. Get a short length of pvc that will easily fit in the intake and match the amsoil filter to it. As you noted, the 4510 is I.D. 4.5" and it matched my intake perfect w/a piece of pvc. I believe 4" pvc is going to be 4.5 O.D. Hope this helps.

Wild4kst8

i know, shameless plug

https://www.dieseltruckresource.com/.../25630/cat/500

high bid

capt. ron what did you decide on?

capt.Ron

oh I ordered the 4091.
It's got the offset flange.
In fact I need to call the guy to see if he's got it in yet.
I thought that a 4" exhaust was 4" I.D. but according to the muffler shop that I got the section of exhaust from it's actually 4" O.D. (at least the piece I got from him was) so the flange should easily fit over the section of pipe.

AggieJustin

FYI, in case you didn't already have your answer. The piece of 4" exhaust pipe slips right in. Getting the intake hose over the flange is a little bit of work, but it fits up as well. Assembled mine this past weekend, now I just have to get it under the hood.

capt.Ron

A little update on this filter.
I've ran it on both my truck and my 09 5.7 R/T Challenger. I didn't feel any noticeable difference with it on the truck but I did on the Challenger. Not so much when I put it on but more so when I put the stock setup back on to take it in to the dealer for an updated flash. The car felt really sluggish by comparison after removing the Amsoil.

Yellow Yota

Here's a picture of my 4091 mounted up in the heat shield I made. (from a template found online)

I supported the flange end by making a cradle out of a half=round piece of 5" exhaust tube. The other end is supported by a piece of flat bar with a hole in it for the stud in the end of the filter.

I shoved a piece of 4" exhaust tube inside the neck of the filter. It's a tight squeeze, but it fits. This way, the hose clamp for the intake tube has a solid fixture to clamp down on, rather than just the soft rubber of the filter.

Putting the intake hose on was the exact same as with a normal BHAF.

This Amsoil filter makes the turbo much louder than the regular paper BHAF. I ALMOST put my silencer ring back in after I installed this filter.