FI air filter - restrictive?

FI air filter - restrictive?

Joined: December 29th, 2005, 6:30 am

June 10th, 2008, 6:01 am #1

While finishing some work, I couldn't endure the look of my rusty air cleaner housing anymore.

In typical fashion, I began to wonder.... Why is the inlet aimed at the hot engine? Why is the inlet smaller than the air ducts? Does the cone-style K&N help with restriction? (beyond the fact that it's a low-restriction filter element)


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Joined: December 21st, 2004, 3:04 am

June 10th, 2008, 6:11 am #2


...maybe more...

1.  Install a conical K&N inside the existing can AFTER drilling about 30 1/2 holes evenly spaced around it so that air flows in from all sides.

2.  Ditch the can entirely and just install the filter.

3.  Ditch the ELBOW and the CAN and install the filter horizontally.

There are several other options for COOL air... but the simplest thing is to pull both side vents and cut off the GRIDWORK so that there are just VERTICAL vents which now allow another 30% of air to flow in from the sides.

You've already ditched the rain tray under the lid... right?


My best,



Tony
Black Tooth and me... since 1983!
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Joined: December 29th, 2005, 6:30 am

June 10th, 2008, 7:37 am #3

just roughed out, but you get the idea



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Joined: July 4th, 2006, 3:49 am

June 10th, 2008, 11:05 am #4

While finishing some work, I couldn't endure the look of my rusty air cleaner housing anymore.

In typical fashion, I began to wonder.... Why is the inlet aimed at the hot engine? Why is the inlet smaller than the air ducts? Does the cone-style K&N help with restriction? (beyond the fact that it's a low-restriction filter element)

but went bottomless in the end with a K&N.




Aaron Gregory
Columbus, OH
FX 19
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Joined: July 19th, 2007, 6:15 pm

June 10th, 2008, 1:09 pm #5

While finishing some work, I couldn't endure the look of my rusty air cleaner housing anymore.

In typical fashion, I began to wonder.... Why is the inlet aimed at the hot engine? Why is the inlet smaller than the air ducts? Does the cone-style K&N help with restriction? (beyond the fact that it's a low-restriction filter element)

Being of the overall belief that things are the way they are on our cars for a reason, I have to believe that there is a reason why the air cleaner's "snout" is one size, the FI ductwork upstream of the intake manifold is another size, and the exhaust tailpipe is a third size. Yet, they are all part of the "air pump plumbing" of an internal combustion engine, which is just an air pump that makes power.

So, my question is, how much improvement in airflow will result from modding the air cleaner or air intake if you don't also mod the exhaust piping system?

I think the snout is there to cut down or tune the noise of air rushng into the engine.

I also think that the engineers did not directly pipe fresh air from the left duct directly into the air cleaner (the way they did with the alternator cooling duct on the right) because, as wacky as it sounds, pulling ambient air from the engine compartment is actually helping air circulation in the engine compartment and helping to keep the temps down back there.

That's my story and I'm sticking to it!
Last edited by FlyerFanDan on June 10th, 2008, 4:31 pm, edited 1 time in total.
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Duane K Estill (Corinth, Mississippi)
Duane K Estill (Corinth, Mississippi)

June 10th, 2008, 1:43 pm #6

While finishing some work, I couldn't endure the look of my rusty air cleaner housing anymore.

In typical fashion, I began to wonder.... Why is the inlet aimed at the hot engine? Why is the inlet smaller than the air ducts? Does the cone-style K&N help with restriction? (beyond the fact that it's a low-restriction filter element)

I found an 88 MR2 in the junkyard that had the big K & N deal on it. I took off the MAF, some ducting, and the filter and ran the ducting to the rear boot and stowed the filter face-open in the left rear wheel well to pull cool air from the Bertone vent as it's an open cavity. Total cost was around $20 and it definitely made a difference. The main thing is more "bwah" on acceleration. It also helps to make sure the spring on the MAF is not too stiff so the thing opens easier.

Here are the pictures.

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Joined: December 31st, 2006, 9:00 pm

June 10th, 2008, 2:06 pm #7

While finishing some work, I couldn't endure the look of my rusty air cleaner housing anymore.

In typical fashion, I began to wonder.... Why is the inlet aimed at the hot engine? Why is the inlet smaller than the air ducts? Does the cone-style K&N help with restriction? (beyond the fact that it's a low-restriction filter element)

Kept it stock, but replaced the wing nut with stainless since the photo was taken...

-Bob Brown

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Joined: July 19th, 2007, 6:15 pm

June 10th, 2008, 2:54 pm #8

Looks like you painted it or had it powdercoated!

Mine comes back from powder coating in a day or two--LOL!

Me like the shiny reservior too---chrome plated?
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Joined: July 28th, 2003, 3:10 am

June 10th, 2008, 2:58 pm #9

While finishing some work, I couldn't endure the look of my rusty air cleaner housing anymore.

In typical fashion, I began to wonder.... Why is the inlet aimed at the hot engine? Why is the inlet smaller than the air ducts? Does the cone-style K&N help with restriction? (beyond the fact that it's a low-restriction filter element)

The air cleaner housing and element are taken from a Fiat diesel application. And diesels need lots of air flow. So, in that sense the housing/filter combination is okay for a stock configured engine. But any engine will benefit from reducing the restrictions to airflow, typically at the expense of a higher noise level.

The choice is yours.

Ciao,

Mark Plaia
SeaX member #007
74 X1/9 - il mela verde
fiatmarko@comcast.net
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Joined: December 31st, 2006, 9:00 pm

June 10th, 2008, 3:07 pm #10

Looks like you painted it or had it powdercoated!

Mine comes back from powder coating in a day or two--LOL!

Me like the shiny reservior too---chrome plated?
The Reservoir tank is polished stainless. The strap that holds it (and hardware) is also stainless.

-Bob
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