Air filters on a 4BD1T

**Fubar** · 22nd August 2018, 08:46 AM

G'day,

With an engine inbound from the builder this week I am ordering more sundries to speed up the conversion.

I have seen some commentary around removing the inner filter on the standard air cleaner as it is restrictive on a healthy turbo'd Isuzu.

Is this a thing or is it based on gut feel assumptions. Idon't feel comfortable removing it if it was deemed necessary by the developers and would look at other air cleaner options that have enough flow (max 500cfmish) with good filtration.

BTW if anyone has the brackets or pics on how the standard air cleaner mounts I'd be very appreciative of either. I had considered leaving the Td5 air box on but I'm not a fan of it & I think the physicals will be prohibitive.

This is what I have to work with.

Cheers,

Jason

**grey_ghost** · 22nd August 2018, 09:25 AM

Hi Jason,

I was speaking to BlackKnight (Dave) a few weeks ago, and from memory he said don't remove the internal filter - it's there for a reason.

I haven't had any experience myself - just passing on what I've heard.

I'd be interested to hear what Bearman thinks.

Cheers,
GG.

**Bigbjorn** · 22nd August 2018, 10:05 AM

Originally Posted by grey_ghost

Hi Jason,

I was speaking to BlackKnight (Dave) a few weeks ago, and from memory he said don't remove the internal filter - it's there for a reason.

I haven't had any experience myself - just passing on what I've heard.

I'd be interested to hear what Bearman thinks.

Cheers,
GG.

The secondary filter is used on vehicles and plant subjected to rough usage and/or heavy dirt. It does not provide any extra filtration. Whatever particles pass through the primary filter will pass through the secondary filter. It is there to provide filtration in case of damage or leaking at the primary filter. Leave it in place.

**weeds** · 22nd August 2018, 10:20 AM

Way back when I had a short stint on project bushranger the inner filter was removed on at least the two GMV and probably on the IIMV, for the duration of the bushmaster/taipan phase. The muffler was removed, a 3” straight through exhaust and were dyno tuned to get the extra fuel right.

The two GMV’s followed the trial vehicles all over Australia without issue.

Sadly MAS post trial ordered the cars be returned to standard

Oh, pretty sure the cover plate was left off as well......I was never a fan of popping the bonnet twice a day.

How many 4WD’s run two air filters anyways.

**bobakers** · 22nd August 2018, 08:25 PM

Had the restriction issue with the standard filter and new turbo so fitted this:
IMG_2305_air filter.jpg

Donaldson powercore

Regards
Bob

**Fubar** · 22nd August 2018, 08:37 PM

Originally Posted by bobakers

Had the restriction issue with the standard filter and new turbo so fitted this:
IMG_2305_air filter.jpg

Donaldson powercore

Regards
Bob

That's interesting Bob...do you remember the model number or cfm?

What did it set you back?

Cheers,

Jason

**bobakers** · 22nd August 2018, 09:11 PM

Hi Jason
Donaldson D090114
4" inlet and outlet
Flow rate up to 554cfm (@ 10")

RRP $347

Took a lot of work to fit...

Regards
Bob

**BadCo.** · 23rd August 2018, 03:04 PM

Originally Posted by bobakers

Had the restriction issue with the standard filter and new turbo so fitted this:
IMG_2305_air filter.jpg

Donaldson powercore

Regards
Bob

That looks like a bit of me!

**Bigbjorn** · 23rd August 2018, 05:14 PM

Using the selection formulae in the Donaldson parts and service book I came up with the following air flow requirements 4BD1 184 cfm, 4BD1T 327 cfm. Donaldson filters are usually sized to provide the required flow when 70% blocked.

**rar110** · 23rd August 2018, 05:47 PM

Does that mean the original is ok? What was used on NPR trucks?

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