Power Driven Diesel Air Filter Restrictive?

MCTNKR

Member
31
2
8
Location
Fountain Hills, AZ
Based on some information I saw on a YouTube video about the benefits of installing the "Dust Bowl" PDD air filter, I decided to try it out. Completely stock 1971 M35A2. IP is still sealed with the lead tags. After installing I went for a spin on my usual route. I immediately noticed on the upgrade section of my route that my full throttle EGT went from the usual 900 degrees to 1100 degrees and that instead of 5 PSI of boost I was reading none. Truck still seemed to perform the same but I am not happy with these numbers. After re-installing the stock air filter my readings were back to normal. I am wondering if this filter is very restrictive and making the truck run rich?

I contacted the vendor for an answer and never received a response. Wondering if anyone else has had a similar experience?
 

Fatalid

Member
Steel Soldiers Supporter
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Location
Mesa, AZ
I don’t have any experience with that particular filter, but based on those numbers, I would come to the same conclusion - too restrictive. A less restrictive filter will lead to lower egt numbers.


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Jeepsinker

Well-known member
5,275
131
63
Location
Dry Creek, Louisiana
You might have seen better results if you skeletonized or removed the step in the sump that blocks the front of the filter. Quite a bit of surface area there.

A stock 5.9L Cummins breathes more air than the multifuel does, so...
 

NebraskaFan

Member
47
23
8
Location
Yankton, South Dakota
Probably a long shot on this, but any updates on the test? I also tried this filter initially it seemed to work alright but after driving ~ 30 miles egts started to climb, boost dropped, and I triggered the air filter indicator. The 5.9 should definitely pull more air, so I'm surprised i had this issue. I took it out and cleaned it, got some dust to blow out, so I'll try it again and see, but if its going to clog up every 30 miles I'll probably have to go back to the old filter.
 

Jeepsinker

Well-known member
5,275
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Location
Dry Creek, Louisiana
I put quite a few miles on mine. Granted, I am running the 5.9L, but I've seen no negative effects.
Did you remove the hump that is spot welded into the bottom of the canister? Try it with the can removed.
I'm firmly of the belief that the canister is restricting flow to the face of the filter and that's causing this issue. The face of the filter is roughly 30-35% of the filter surface.
 

NebraskaFan

Member
47
23
8
Location
Yankton, South Dakota
I put quite a few miles on mine. Granted, I am running the 5.9L, but I've seen no negative effects.
Did you remove the hump that is spot welded into the bottom of the canister? Try it with the can removed.
I'm firmly of the belief that the canister is restricting flow to the face of the filter and that's causing this issue. The face of the filter is roughly 30-35% of the filter surface.
I'll try running without the can and see what it does, I'm guessing you're right though. If that works then I'll cut out the hump. Are you using the 7" or 9" filter? Either way it really doesn't seem possible that the multi can out flow the 7" one that I have.
 

NebraskaFan

Member
47
23
8
Location
Yankton, South Dakota
I'm using the 7" filter.
So I tried without the filter housing, and it seemed to help, though i was only getting ~10-11 psi vs usually I can hit 12-13, but egts didn't seem awful. So I cut the bottom of the filter housing out, and it seemed good for about the first 90 miles (I cleaned the filter too FWIW) but then I started losing boost egts became an issue. I contacted PDD and they said the 7" filter is good for about 800 cfm, so it should be more than enough. They recommended I try the performer filter, but I'm not sure if i want to risk letting dirt by. So maybe I need to try the 9" dust bowl? Or perhaps look to other filters?
 

davidb56

Well-known member
Steel Soldiers Supporter
707
378
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Location
Bonners Ferry Idaho
So I tried without the filter housing, and it seemed to help, though i was only getting ~10-11 psi vs usually I can hit 12-13, but egts didn't seem awful. So I cut the bottom of the filter housing out, and it seemed good for about the first 90 miles (I cleaned the filter too FWIW) but then I started losing boost egts became an issue. I contacted PDD and they said the 7" filter is good for about 800 cfm, so it should be more than enough. They recommended I try the performer filter, but I'm not sure if i want to risk letting dirt by. So maybe I need to try the 9" dust bowl? Or perhaps look to other filters?
what are your readings EGT/Boost with the stock filter?
 

NebraskaFan

Member
47
23
8
Location
Yankton, South Dakota
Does anyone have a way to look up donaldson filters by size? These look like they'd be worth a shot.
I'm going to try calling their customer service line to see if they can look them up by size.

I would think the 9" PDD filter would flow enough, but I'm not sure I want to gamble. The surface area on the 9" filter is roughly 70% of the stock deuce filter, so that has me concerned. Although, the 9" filter has 29% more surface area than the 7" filter... so maybe that's enough? Perhaps I just send it with the 9" performer filter and just hope for the best.
 

NebraskaFan

Member
47
23
8
Location
Yankton, South Dakota
maybe you could "snorkel" your air intake to cab top height. I don't have a clue what setup you got without a pic.
Mine has the stock side panel inlet right now.
That would probably help with the loading up of the filter.. might be worth a shot. I'll probably try a different filter first though, since this one seems to be cutting boost by a psi or two, even when clean. A snorkel is still a good idea though, the less dirt it eats the better.
 

davidb56

Well-known member
Steel Soldiers Supporter
707
378
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Location
Bonners Ferry Idaho
Mine has the stock side panel inlet right now.
That would probably help with the loading up of the filter.. might be worth a shot. I'll probably try a different filter first though, since this one seems to be cutting boost by a psi or two, even when clean. A snorkel is still a good idea though, the less dirt it eats the better.
I bought the fittings from Summit Racing out of NV for under 75$ . I reused to mushroom cap and u clamp to remove it from the side and access the panel.IMG_0314.JPG
 
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