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BHAF filters

Blueox01
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Blueox01

Blueox01

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Thx, Mike,  getting the Donaldson ,hoping this might it in my old Bullydog RFI, if not I guess my iron guy will get that bullydog sheet metal. I guess they no longer care about 2nd Gen Trucks anyway.

 

P.S agree on 2nd and organic pain relief, was using it for severe ankle arthritis.

Edited by Blueox01
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Max Tune

Max Tune

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1 hour ago, Mopar1973Man said:

First off I've never seen a BHAF collapse yet. Even with my pulling 47 PSI of boost. I've gotta ask about what is causing the collapse...

 

 

I would guess really dusty conditions with a sever lack of maintenance....

 

Then a long wot pull. Still, it seems hard to imagine.

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AH64ID

AH64ID

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For a stock wastegated HX35 that's enough filter at a HR rating of 648 cfm, for anything bigger (or boost up above 30 on a HX35), it's not enough filter. 

 

One thing I have found after researching commonly used BHAF's is that they are large on physical size and small of CFM. Most of them just don't have the flow because there isn't much surface area for the media relative to their size. 

 

You don't have to have one collapse to outflow it's capabilities. 

Edited by AH64ID
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dripley

dripley

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1 hour ago, AH64ID said:

For a stock wastegated HX35 that's enough filter at a HR rating of 648 cfm, for anything bigger (or boost up above 30 on a HX35), it's not enough filter. 

 

One thing I have found after researching commonly used BHAF's is that they are large on physical size and small of CFM. Most of them just don't have the flow because there isn't much surface area for the media relative to their size. 

 

You don't have to have one collapse to outflow it's capabilities. 

So what is a good alternative?

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greed

greed

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I put on a Donaldson - Volant filter. Volant part #61504. Dimensions are 8" X 8" with 4" intake. Supposed to be good for 150,000 miles. I don't remember how fine it filters. Supposed to flow about 1,200 CFM. I know I can hear the turbo more over what I could hear with a Wix BHAF. Specs and a video are on the Volant website. There is also a Outerwears type pre-filter, part #51921.

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Mopar1973Man

Mopar1973Man

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Being the filter minders for our truck is rated in inches of water column let's say I've never moved the filter minder once in 135k miles. I'm for sure not out flowing the filter. Everyone can throw tons of specs of filters out but how about taking a measurement of the amount of vacuum in the filter? Been there done that... Now if your pulling vacuum on the filter and can actually measure inches of water column or move the filter minder then I'd say you are out flowing the filter for sure. 

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Mopar1973Man

Mopar1973Man

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I've tested my filter minder numerous times and the amount of vacuum is so light to pull the disk all the way down is unbelievable. If the filter minder isn't moving then there is zero worry about filter restriction.  

 

There is a difference between speaking a bunch of specs from a book than actually making real-world measurement and find out there is a whole different world and information. This why I don't get all crazy about specs in a book. I'm more into actual real-time measurements and what a device or part can really do. Just like my turbo is way outside its mapped area specs wise but real-world measurement it works awesome. Great sprint turbo for quick boost of power for passing. 

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AH64ID

AH64ID

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How do you think Donaldson and OEM’s come up with their ratings? Throw a dart at a board? Or do actual testing? 

 

The issue with outflowing a filter isn’t just restriction, it can also be filtration effectiveness.  

 

Looking at the Donaldson in question it’s high restriction flow rating comes in at 8”HG.. which in a filter minder is at the barely moved setting, with green going to nearly triple that. Big disparity between the filter ratings and the filter minder. So it’s not surprising that a filter minder doesn’t move. 

 

So there are multiple things to consider. 

 

Generally speaking air filters are undersized on almost every modified rig out there. It is what it is, but we also have to consider that 99% of the time the flow is lower than the filter rating. That’s why undersized air filters can work for most applications. 

 

 

@dripley I always recommend a good pleated filter in a sealed box. I’ve never been a fan of a BHAF, especially on 2nd gens where the filters are in such a warm spot in the engine bay. Heat shield or not, that corner is hot. 

 

We already know the IAT sensor location on a 2nd gen provides a high reading, so the added temp from a BHAF in the OE corner will be masked by the false reading. 

 

Just my 0.02. 

 

 

 

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LegendaryKing

LegendaryKing

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On 4/7/2019 at 7:02 PM, Mopar1973Man said:

First off I've never seen a BHAF collapse yet. Even with my pulling 47 PSI of boost. I've gotta ask about what is causing the collapse...

 

 

 

Most likely wet filter element.  With as much as I have my hood open when its raining I think the few extra dollars is worth the protection some mesh can provide against the filter entering my engine.

 

Also, good information about the filter minder from the source:

http://filterminder.com/resources/learn-more/39-resources.html

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