Car/truck with air filter assembly with 3 intake

JDemaris · Feb 23, 2010

Anybody happen to know of a car or truck with a self-contained air-fiter box that uses a 3" hose hookup?

I've got a small 4WD diesel motorhome I'm putting a turbocharger on. Engine is a GM 6.2 diesel and I need an air-filter assembly to fit the turbo.

I know I can order one from Banks Engineering (place that makes turbo kits) but they will charge a fortune. K&N the same. They want well over $200 for housings.

I can buy a used air-cleaner assembly from the on-line junkyard database for under $50, but I have to know what make and model.

I checked my 92 Dodge with Cummmins diesel and it has a huge air-intake. Looks like a 5" or 6" hose on it. My Ford 7.3 turbo diesel is parked 1000 miles away in Michigan, so I can't run out to measure it. If I have to, I guess I could use the Dodge-Cummins and neck the size down to 3". I'd rather just find something that is the correct size.

I'm kind of wondering what a 95 and newer Chevy truck with a 6.5 turbo-diesel might use? Or, newer Ford?

Gas or diesel doesn't matter. Just need something fairly compact that will hook to a 3" hose.

LilFarmer · Feb 23, 2010

Jd,

I have a '99 Suburban with a 7.4 (454) that has a fender mounted, self contained air filter. It isn't where I can look at it right now (Wife drove it to work), but if memory serves it has to be close to a 3" outlet to the MAF.

Have a good day.

JDemaris · Feb 23, 2010

Thansk.That sounds like it would be perfect if 3". I'm going to try find out.

PJH · Feb 23, 2010

ShopVac filter and/or hose? I was thinking my shopvac had a 3" hose. I've built air filters on a smaller scale. Flat plate top and bottom with appropriate sized fitting and a thru rod/wingnut. Would require a sacrificial ShopVac if indeed the right size.

Hairbrained idea Paul

BCnT · Feb 23, 2010

all my Fords have dual 2.5 hoses from air box to throttle body...theyre early to mid 90's

CJ_1080 · Feb 23, 2010

Use one of those because they use a donnaldson filter or go to an autozone or Summitracing.com and you can get all the parts you need on there.

Sean Feeney · Feb 23, 2010

Check 95 chevy caprice I think that had 3"

MisterT · Feb 23, 2010

(quoted from post at 18:34:36 02/23/10) Jd,

I have a '99 Suburban with a 7.4 (454) that has a fender mounted, self contained air filter. It isn't where I can look at it right now (Wife drove it to work), but if memory serves it has to be close to a 3" outlet to the MAF.

Have a good day.

I'm not sure on my '01 chevy with the 8.1, but it's also got to be be close to 3".

Anonymous-0 · Feb 23, 2010

1997 Jeep Grand Cherokee would be awfully close. Squarish box with easy mounting and flat filter, too.

Johnski · Feb 23, 2010

Check out Surplus Center, they show a couple you might be able to use. Jf
Untitled URL Link

JDemaris · Feb 23, 2010

Thanks. To my surprise, they have exactly what I'm looking for. 3" inlet, 190 CFM, and dual element.
Made by Donaldson and I can buy replacement elements anywhere. It's a industrial type with dual elements.

I buy from Surplus Center often, but hadn't thought of looking there until you mentioned it.
I buy a lot of hydraulic parts and electrical relays from them.

karl f · Feb 23, 2010

(quoted from post at 11:39:37 02/23/10) Check 95 chevy caprice I think that had 3"

and a very common filter element. same element as grand prix, lesabre, olds w/ 3.8. millions of cars.
karl f

Lumpy · Feb 23, 2010

Just remember, the more air a turbo can get, the better they run. A restricted turbo is not a good thing.

Anonymous-0 · Feb 23, 2010

If my calculations are correct here is what I come up with:
1 liter = 0.0353146667 Cubic Ft
6.2 X 0.0353146667 = .218 / 2(half of the cylinders breathing out per rev) =.109482 CF/Revolution
0.108482 x 2500 RPM = 273.7 CFM
I think you may be starving the system with that filter.

Anonymous-0 · Feb 23, 2010

Try a Baldwin PA2818. t should be what you are looking for. JJ

JDemaris · Feb 24, 2010

For a turbo, you hit it right on the nose. I'm not building a street racer. This is a small 4WD motorhome and I'm rarely going to run the engine above it's peak torque curve -which is around 2000 RPM. At that engine speed, it should have 375 lb. ft. of torque and 136 horse. That would require around 200 CFM. But, some needs to be added for dirt in filter, and those rare times when I stomp on the pedal to climb a steep hill, pass, etc.

A stock (no turbo) 6.2 run at 2000 RPM needs around 130 CFM. 6.2 (379 cubes) has a volumetric efficiency of 60%.

General rule of thumb that takes all into consideration (turbo or no turbo) is 1.5 times horsepower equals CFM need.

A stock (non turbo) 6.2 barely climbs above 120 horsepower - which comes to 180 CFM.

A 6.2 with a turbo, when driven in a "useful" RPM range, can make a max of 200 horse, thus needing around 300 CFM of air flow.

Car/truck with air filter assembly with 3 intake

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