Air Cleaner Modifications

[porkysplace]

Wouldn't it make more sense to add this to the other thread you started on this and finish that thread rather than stat a new thread on the same thing ? Doing this just makes searching that much more difficult .
Air Cleaner Modifications

Edit; Maybe a moderator will merge them.

 

[acme66]

Yep you are right, forgot that I had already stared a special thread on this. Glad you caught it and fixed it.

-Ken

 

[swbradley1]

Merged

 

[mdmorgan]

acme66, Thanks for the great write up and the research, my M936 needs all the help it can get, it has a hard enough time moving its self down the road let alone towing another vehicle.

 

[wreckerman893]

my M936 needs all the help it can get, it has a hard enough time moving its self down the road let alone towing another vehicle.

They are a toad in the road but dam ain't it nice to have one in the yard.

 

[Jakelc15]

I think your right, that filter should flow better than stock. But I'm not sure if it will filter as good as it needs to. It is designed to be used with an inner secondary filter.
Wix 46664 flows about 1000 cfm
More modern turbo'd 855's use a filter that flows about 1500 cfm
I know our engines aren't the big hp engines found in a nice Pete but the displacement and rpms are the same. The turbo should be the only thing that significantly changes the cfm flow of the engine.

Please post any findings with this new filter. Also do you think the inner filter can be used as well?

 

[Jakelc15]

Our engines, without a turbo, require 900-1000 cfm.
A turbo engine can require 1500+ cfm.
I don't think the stock air filter is up to the task of a turbo.

 

[camoyj7]

Nice write up. I know my M931a2 need a better air filter set up. I was thinking about adding another filter under the hood. I think I'll try this first.

 

[o1951]

I am wondering if the reason you found all that dirt in the intake is because someone else figured out the filter was a big restriction and tossed it.

 

[MO MV man]

I just installed the WIX 46664.
I used wire just like acme66 did and it fit GREAT!

It's monsoon season here so no driving impressions.
The moment I get some seat time, I'll report.

My old Donaldson was FAR from "bad" but it had a pronounced clean area where it "hides" under the inner shroud.
The new filter has PLENTY of room to breathe now-zero housing related restrictions.

Airflow requirements:
I went with the Donaldson engine airflow requirement chart-VERY all-inclusive list broken down by manufacturer and engine designation.
It says a 250HP 6CTA8.3 requires 632cfm at 2500 rpm's.
WIX claims 950cfm with the 46664.
The original Donaldson I removed has 550cfm stamped right onto the metal end cap.
And to think over 1/3 of it wasn't doing anything!
That being said, how little flow (theoretically) was it allowing?

I can say with certainty that after my straight pipe conversion when I'd lay into the throttle, the filter minder would move, signalling restriction.

I cannot wait to get some time behind the wheel!

 

[Jeepsinker]

I never saw any pics or mention of wire used. I may have to do this with my 936 if you guys get noticeable results.

 

[crewcab454]

Subscribed

 

[MO MV man]

I never saw any pics or mention of wire used. I may have to do this with my 936 if you guys get noticeable results.

You can find the wire and how he (and I) used it in the YouTube video he made.
VERY simple and effective mod to support the smaller OD of the replacement filter.

 

[MO MV man]

I was JUST perusing the "Today's Posts" and look what I found.......
I'll be darned.

Those Military Guys have come to the rescue again.
A drop-in kit with a NICE filter support/spacer wire!:
http://www.steelsoldiers.com/showthread.php?124242-New-air-cleaner-upgrade-for-the-m939-trucks

 

[Jeepsinker]

That's pretty cool

 

[MO MV man]

I'm dying to take my truck for a spin and see how it runs now.

Then it's time to start the pump mods.

 

[MtnSnow]

Ouch a 125 bucks for a 10 dollar piece of bent wire (probably cost less in bulk numbers to have made) and a Fleet-guard air filter # AF25354 (shipped from multiple place for just under 60 bucks)....I've bought a few items from TMG but Ouch!

 

[162tcat]

Before everyone runs out and throws money at this, don't expect to see or feel a noticeable gain. These are 20,000lb+ trucks, not your honda civic race car. I'm running a donaldson housing capable of 1350 cfm and noticed no difference on my turbo'd 250. The only reason I got a new housing was to replace the old rusty one and have in stock filters available.

Your better off spending that money changing your coolant to the proper SCA type, changing your oil or repacking your wheel bearings.

 

[davo727]

So the wix 46664 is listed as an outer filter, what is it supposed to have as an inner filter?

I just installed the WIX 46664.
!

 

[MtnSnow]

The Fleetguard filter is a "replacement" filters that can be used inplace of OEM Donaldson filter that is not really available via the normal sales channels the general public have access to.

As for the Wix filter I'm not sure