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Discussion Starter #1 (Edited)
Has anybody tried fitting the NAPA Gold "Big Kahuna" #1333 oil filter on the V6 ATQ engine?

I compared the relevant specs on the Big Kahuna 1333 filter to the #1355 filter that NAPA specs for the V6 ATQ engine. These are the results:

FIL #1333
Gasket ID - 62.54 mm
Gasket OD - 71.98 mm
Filter Height - 177.34 mm
Filter OD - 93.22 mm
Flow Rate (@19 micron) - 7-9 GPM
Thread Size - 3/4 -16

FIL #1355
Gasket ID - 62.36 mm
Gasket OD - 69.98 mm
Filter Height - 113.67 mm
Filter OD - 95.12 mm
Flow Rate (@24 micron) - 7-9 GPM
Thread Size - 3/4 - 16

It appears that the difference in the gasket ID/OD measurements may cause the Big Kahuna 1333 to leak when installed on the V6 ATQ engine?

Doing the math...

The NAPA Gold Big Kahuna #1333 filter provides ~35% additional filter area over the NAPA Gold #1355 oil filter that NAPA specs to the V6 ATQ engine.

If I could add 35% more oil filter area, and increase filtration granularity from 24 microns to 19 microns, by using the Big Khauna 1333 oil filter on the V6 ATQ engine - and have confidence that the filter won't leak - I would definitely do it.

:wrench:

Cheers!
 

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Are the bypass pressures similar? Seems like something to look at as well because you don't want a filter that bypasses when it shouldn't and vice versa also.
 

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Discussion Starter #4
The bypass pressure specs weren't listed on the website.

I shot an email to NAPA Technical Support tonight to ask if they can confirm the bypass pressures for the two part numbers FIL 1333 & FIL 1355.

Will advise if they respond with that info.

Cheers!
 

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he just thinks he's amazing. really. no kidding.
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The specs in your first post compare an OEM V6 filter to the Big Kahuna, correct?

If so, why not just compare to the OEM I4t filter's specs to see if the differences are similar?
 

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I had a 1.8T 2 years ago which was totalled and replaced with a V6. I ended up with some big filters that I thought I could use with the V6 but when I tried them on the V6 they leaked. My 2 cents worth...
 

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I know the AHA and ATQ filters are not interchangeable (because of bypass pressure?). They only work in one direction--ATQ filters can be used on AHA, but not vice versa.

Also, IIRC, there is a length limitation in the ATQ, right? All of my AHA filters are pretty long, but all of the ATQ filters I've seen have been pretty stubby.

Either way, shouldn't be a big issue. The V6 already has ~6.5 qts, doesn't work terribly hard, and doesn't see turbo temps. I wouldn't overthink it. ;)
 

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These are made by Wix - correct? Assuming they are just rebranded and not made to custom specs here are the specs - although I'm a little confused because the filter I found below was not the one listed for the Passat L4 and it's not showing any VWs at all in the application list. The one they show for the L4 is http://www.wixfilters.com/filterlookup/PartDetail.asp?Part=51393

V6 - http://www.wixfilters.com/filterlookup/PartDetail.asp?Part=51355 - bypass is 33 psi
L4 - http://www.wixfilters.com/filterlookup/PartDetail.asp?Part=51333 - bypass is 30

not much difference in the bypass at any rate....I thought I saw on another filter mfr site that the difference was greater....anyway - I'm way out of my league talking about the 1.8L engines being a V6er - I just haven't paid attention to the whole big filter thing...just wanted to pass along the above links - the main wix filter lookup page is at http://www.wixfilters.com/filterlookup/index.asp

Chris
 

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I had one laying around and used it on my 1996 2.8L 12V. I can't recall all the details now, but I dod consult the NAPA site for the specs and it was fine. No ill effects.
 
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