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Air Flow CFM?

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Kevin Means

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We're planning to replace the stock air intake filter with a Donaldson D090266 air filter system (or similar if someone has a better idea) We need a vertically mounted filter, because the front wall of the habitat will be about one foot behind the cab. While researching air intake systems, I noticed that many of them list their CFM airflow, but I can't find a listing of our CAT 3116's airflow to verify compatibility. Ours is a stock 225 HP 3116. Anyone know its airflow?

Kevin
 
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GeneralDisorder

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Kevin Means said:
We're planning to replace the stock air intake filter with a Donaldson D090266 air filter system (or similar if someone has a better idea) We need a vertically mounted filter, because the front wall of the habitat will be about one foot behind the cab. While researching air intake systems, I noticed that many of them list their CFM airflow, but I can't find a listing of our CAT 3116's airflow to verify compatibility. Ours is a stock 225 HP 3116. Anyone know its airflow?

Kevin
Click to expand...

288 CFM.

CFM of the filter needs to be AT LEAST 288 CFM even when the filter is plugged and needs to be replaced and the filter size has to be large enough that cleaning it isn't a nuisance - a simple 2" diameter unrestricted pipe flows 1,615 CFM (at sea level atmopsheric pressure ~14.7 psi) for example. The size of the filter is largely a function of the filter surface area and how often you want to clean/change it. If you plan a lot of off-road, especially dusty conditions, you want a LARGE filter or several of them so they don't clog up immediately.

My point is that bascially ANY filter is going to flow that much air - because that much air (at atmospheric pressure) will flow through a 1" diameter pipe that's 4' long...... right up till the filter on the end of it clogs up - which if it's just the end of a 1" diameter pipe then the surface area is about 0.785 sqaure inches which would clog up almost immediately. Now of course the filter itself is a restriction but this goes up exponentially (squared) as the orifice increases in diameter so it becomes a non-issue in a hurry. Plus you never just stretch the filter material over the end of the pipe - it's always in some sort of pleated arrangement to increase it's surface area.......

What you need to decide on is how much filter Surface Area you want and how dirty of an environment you will be in..... now you see how the truck ended up with a filter the size of a trash can........
 
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GeneralDisorder

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Ronmar said:
Yea the OEM filter is a little overkill for 6.6-7.2L engine:)
Click to expand...
I feel like it's wrong to state it exactly in that way since the filter size is really a function of how dirty the environment is....... if the engine was operating in a clean room it wouldn't actually need a filter at all. And the eductor /spin housing for particulate extraction only exists as a consequence of the environment.

The size of the engine was not one of the top three reasons for the excessive filter size I guess is my point. It's not irrelevant it's just not the most important factor.
 
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olly hondro

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Good discussion and timely as I replumb intake piping. Of all the stuff I deleted, I kept the trash can but shortened the snorkel. I concur that it's overkill, but I have space for it and it looks cool.

 
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dwlindsey

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On my 1088 there's a tube, maybe 1.75 or 2 inches in diameter that runs from the air filter to the exhaust pipe.

In the Donaldson literature, there are notes about "scavenge", which apparently improves performance.

Is that flexible tube that goes to the exhaust pipe "scavenge"?
 
AKPacker

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dwlindsey said:
On my 1088 there's a tube, maybe 1.75 or 2 inches in diameter that runs from the air filter to the exhaust pipe.

In the Donaldson literature, there are notes about "scavenge", which apparently improves performance.

Is that flexible tube that goes to the exhaust pipe "scavenge"?
Click to expand...
That hose is attached to the air cleaner underneath a set of venturis that spin out large dust particles, and the other end is attached to a venturi in the exhaust pipe that creates suction. It basically vacuums out the large dust particles from the air filter and purges them out the exhaust.
 
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dwlindsey

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AKPacker said:
That hose is attached to the air cleaner underneath a set of venturis that spin out large dust particles, and the other end is attached to a venturi in the exhaust pipe that creates suction. It basically vacuums out the large dust particles from the air filter and purges them out the exhaust.
Click to expand...
So that's a scavenge hose.
I did a quick google:
redekopmfg.com

What is an Exhaust Scavenger Port? - Redekop

What is a Scavenger? A scavenger port is where the contaminants that were removed from the intake air by the equipment’s OEM pre-cleaner go to be disposed of. How is the dust disposed? The dust is either removed by a venturi in the exhaust system or by a blower. 1. The exhaust scavenger uses its […]
redekopmfg.com redekopmfg.com

Looking at the Donaldson Powercore PSD specs here:

Scavenge dramatically improves performance.

So I'll figure out a way to hook that tube up to the Powercore PSD when I install it
 
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Ronmar

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Yep, scavenge. Many tractor/equipment filter casings employ a form of spin filtration to spin and settle out the larger heavier particles to a low/quiet spot(scavenge port)…

the caution here is that the OEM particle separator output has a flapper check valve on it to prevent any exhaust carbon from being sucked back into the filter… it only allows flow toward the exhaust Venturi when there is sufficient ex flow to create enough vacuum to pull open that flapper… I would want to re-creat that check valve…

even with regular vacuum from the exhaust Venturi, the OEM particle separator can still collect a LOT of dirt and debris and should be blown clean with a long blow gun air pipe thru that vacuum port(remove elbow, and flapper), just be careful not to damage the vortex generators Inside…

i deleted that separator from my filter assembly, as the exhaust Venturi is now above the rear bumper and the air filter can will be on the front of the habitat above the cab:)
 
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