K&N air filters - Diesel Bombers



1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

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Old 11-23-2009, 10:55 AM
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Default K&N air filters

i have been told that you dont want to put K&N air filters on your truck because the filter will allow the oils out of the filter pass by and hurt the turbo, does any body know
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Old 11-23-2009, 11:19 AM
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I've heard the same thing. I have a K&N in my truck, because it was in here when I bought it. I also just dismantled my turbo to upgrade it and saw nothing bad at all. There was no residues or anything. I've just been lazy and haven't gotten the BHAF yet.
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Old 11-23-2009, 11:40 AM
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hey muskrat, what is this bhaf unit you are talking about? i did quite a bit of looking around for my 91 and all i came up with was k and n or an air raid. wound up purchasing the kand n.
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Old 11-23-2009, 11:55 AM
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BHAF= Big Honkin Air Filter. They are just an extra big filter that fits our air intake. They require a special home brewed mount of one sort or another. The "old smokey mount" is popular. I'll try and hook you up with more info in a moment.
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Old 11-23-2009, 12:06 PM
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i appreciate it.
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Old 11-23-2009, 12:40 PM
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Found it. Here is a thread with the part #s for our trucks and directions for the mount.

https://www.dieselbombers.com/1st-ge...7-air-box.html
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Old 11-23-2009, 06:07 PM
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thanks musk! i found my project for tomorrow.
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Old 11-23-2009, 06:33 PM
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I have K+N's in both of my trucks. Work fine for me.
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Old 11-24-2009, 07:39 AM
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I,ve run K&N and Green HP air filters - I'm currently running a Green HP on a custom built intake to the turbo. I have not had any trouble with either one. The key is to not over oil either one.

Bob
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Old 11-24-2009, 07:49 AM
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I understand it as…

If you put to much oil on the filter some oil will pass though the filter and end up on down stream electronics. A stock filter will trap more dirt then a K&N if it’s not oiled (I have been told).
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