1200 CFM Filter!!

[JayWm]

Nice Vaughn, very nice indeed.....



Hohn, love your sig... that's too funny.

 

[Jim Fulmer]

Jim, I have a smaller version of that... 12 inches long, with a 5" outlet.



I have one of those too but I sucked the seal out of the B/B with it... ... . not quite enough.



Jim

 

[Hohn]

Anyone know for certain what a Donaldson BHAF flows @ 5" or 8" H2O?

Donaldson BHAF (B105006) flows 450CFM @ 6" wc

NOt very impressive.

Stock 3rd gen filter flows 452 CFM @ 4. 62" wc

BHAFs usually give improvements because they ditch the crappy OEM airbox. The filter itself isn't that restrictive.

Fleetguard outsoruces BHAF production to Donaldson.

If you buy a BHAF, it's a Donaldson, NO MATTER where you buy it or what "brand" it is. Kinda like how most oil filters are made by only a couple companies, no matter what it says on the canister.

jh

 

[Hohn]

Part Number: 42790
UPC Number: 765809427907
Principal Application: Donaldson Disposable Housing
All Applications
Style: Air Filter
Service: Air
Height: 11. 880
Outer Diameter: 10. 500
Inner Diameter Top: Closed
Inner Diameter Bottom: 4. 000
Ends: Plastic
CFM: 680

Restriction: unknown

I'm pretty sure that the 680CFM spec is at 10"

That's why the disparity between the 450CFM I quoted and the 680 spec given above.

 

[Hohn]

Oh, to add context: 27. 6" inches of water is a single PSI.

So even at the horrendous restriction of 27. 6", you're only dropping the pressure of the atmosphere (to the turbo) by a SINGLE PSI.

Of course, even this lone single psi may be enough to collapse a filter. If a BHAF has 144 sq in surface area, that 144LB of force on the filter-- probably enough to collapse it.

So you can get 1200 CFM with relative ease. You just pay a price in restriction (inches of water) and filtration efficiency.


Note that a BHAF is 99. 99% efficient (not sure at what micron) but the stock filter is "only" 99. 56% efficient. That extra efficiency is the main reason that the BHAF flows pretty poorly given its size.

BHAF are NOT designed for high flow, plain and simple. They are designed for long service life and high efficiency above all, while delivering ADEQUATE flow.

If you only need 400-600CFM, then a BHAF is perfect for you.


But at 1200CFM, you need a lot more radical steps.

 

[swankmetal]

hey hohn, where should i look for specs on my napa filter? they weren't much help. part #6644.

 

[Hohn]

Sorry to keep posting, but let me add something else into the mix.

Has anyone seen the Dyson Vacuum cleaners? They have me VERY intrigued.


When you need a LOT of flow in a smaller package, I'm convinced that a centrifugal air filter could be very helpful. It could/would be shaped like a turbine scroll, accelerating the air as the radius got smaller.

Line the outer radius of this "snail shell" with some kind of mat to catch things and I think you'd be on to something.


Think along the lines of the "spinner II" oil filter, only tailored for AIR filtration.

How fast would you have to accelerate the airflow to get even the smallest particles to be forced to the outside?

If you do the A=V^2/R and the F=MA, you could probably correlate a certain intake velocity to a certain particle size, based on the mass of a particle you'd assume using the reference density of stone (since that's what most dirt is, right?).

Just thinking out loud.

 

[Hohn]

hey hohn, where should i look for specs on my napa filter? they weren't much help. part #6644.

That isn't a BHAF is it?

The NAPA BHAF is #2790, if I remember.

 

[RonA]

I think fabbing something like what Piers put on his blue Ford conversion would be nice.

 

[Diesel Freak]

I think fabbing something like what Piers put on his blue Ford conversion would be nice.

that would definately be the hot ticket!!

 

[swankmetal]

That isn't a BHAF is it?

not even close. take a look at the thread i posted a link to in response #20. it's got a pic or two.

 

[AK RAM]

The current AFE I have is too small.

How do you know that?…. what a particular AFE filter flows? I have never been able to find flow specs for particular AFE part numbers.



Here is the 2006 AFE universal clamp-on catalog page with every spec to include part numbers……except flow ratings. http://www.cumminsforum.com/forum/attachment.php?attachmentid=1002&d=1144342727

 

[Diesel Freak]

How do you know that?…. what a particular AFE filter flows? I have never been able to find flow specs for particular AFE part numbers.



Here is the 2006 AFE universal clamp-on catalog page with every spec to include part numbers……except flow ratings. http://www.cumminsforum.com/forum/attachment.php?attachmentid=1002&d=1144342727

I did not measure air flow... however the pressure drop across the filter is enough to peg a filter minder at just 30 psi of boost from a HX40 used as a single.



At 50 psi, mucho oil gets sucked out of the primary in my twins.

 

[AK RAM]

Ouch. And which AFE part number would this be?

 

[Diesel Freak]

umm you are missing the point



Jim, I have a smaller version of that... 12 inches long, with a 5" outlet.



AFE # 2450512

here ya go

 

[AK RAM]

Aaahhh…. . no one reads the first two pages of a thread! :-laf

 

[Jeff_K]

why don't you try the 24-50518 which seems to be what some of the twins builders are using? It is 5" inlet and 18" long.

 

[Vaughn MacKenzie]

I did not measure air flow... however the pressure drop across the filter is enough to peg a filter minder at just 30 psi of boost from a HX40 used as a single.



At 50 psi, mucho oil gets sucked out of the primary in my twins.

Cliff I wonder if an environment with high humidity could reduce effective flow rate of a paper media filter. Water vapor could slowly swell the fibers enough to restrict air molecules passing between them, and given the airflow of a Cummins it wouldn't take long to pass a substantial amount of moisture through the media.



Another thing is I recall back in the early days of the BHAF I read a post comparing flow rates of the different brands. . . Wix, Baldwin, Napa, Fleetguard, etc. There was a substantial difference between them. I don't recall how each brand fared specifically and if the numbers came from the manufacturer or a comparison test, but I do remember the Fleetguard's flow rate was considerably higher than the others.



I do know BHAFs haven't worked too well for twins, especially the bigger ones. I remember Jim Fuller totally sucking his in before switching to an AFE or something similar.



Vaughn

 

[BPonci]

The afe 24-50518 is a ok filter. I can suck the filter minder down in valet at 50 psi in the hat and 26 to 28 psi in the cold pipe. I am waiting on a new style filter to show up that should work well.

 

[The Adjuster]

DF



Try this place . . I know they make filters that are 99. 9% efficient at 0. 5micron and have capacities up to 2500 CFM



... dunno what prices they run, but this place supplies the filters for the HUGE gas turbines on oil refineries/platforms in the Gulf, but they also have similar to BHAF in varying sizes that you may be able to adapt.



Might have to add 1 foot to the front of ya truck to fit some of these bad boys in !!! :-laf



Go Here



Kevin



BTW ... stil no luck on the other matter :{