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CFM: Air Filters/Engine Requirements
08-11-2004, 05:57 PM
Post: #1
 
Ok, I need some technical info on CFM and surface filtering area of air filters and engine CFM requirements.

My 5.9L V8 360 cid motor is rated:
-245 HP @ 4,000 RPMS
-345 TQ @ 3,200 RPMS

The stock paper air filter size is 13.5" long x 6.5" wide x 1" tall.

Three main questions to start with:
1) What is the total surface filtering area be of this sized filter?

2)What is the CFM air flow rate be for this sized air filter?

3? What is the CFM requirements for my 5.9L V8 360cid motor?

I have heard that the 360 motor only 'needs' 350 CFM-425 CFM, so 'function'. I just would like to clarify this CFM number. Is there are calculator I could use to determine the CFM for my motor?

Lastly, what is the the stock 5.9L V8 throttle body rated at? I have also heard anywhere from 635 CFM upto 690 CFM.

Thanks for any and all info on this.




04 QC/LB, 4WD, 305/555 HO CTD, 37x12.50/H2, 6 Lift, MBRP 5", GDP Power-Flo, GDP Air Boss, GDP Grid Delete, IceBox Intake, Air Dog 150, ATS Pulse Flow Manifold, BD Special, SMARTY SR POD, ARP Studs, T&C WILD Fuel Rail, T&C CPRV, II Dragon Fire 85% CP3, II 100HP Nozzles, Built 48RE Trans.....
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08-11-2004, 06:16 PM
Post: #2
 
Quote:Three main questions to start with:
1) What is the total surface filtering area be of this sized filter?

2)What is the CFM air flow rate be for this sized air filter?

3? What is the CFM requirements for my 5.9L V8 360cid motor?

(1) - cant be computed that way, to many variables.
(2) - cant be computed that way, to many variables.
(3) - no idea
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08-11-2004, 11:38 PM
Post: #3
 
Can't help on 1 or 2, but on the 3rd question you can use this generic forumla to figure the required cfm for your motor.

cubic inches times max rpm of motor, divided by 3456 (360 * 5500rpm / 3456 = 572cfm)

Hope that helps
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08-12-2004, 04:28 AM
Post: #4
 
BB Tony,
Thanks for the info. Helps alot.




04 QC/LB, 4WD, 305/555 HO CTD, 37x12.50/H2, 6 Lift, MBRP 5", GDP Power-Flo, GDP Air Boss, GDP Grid Delete, IceBox Intake, Air Dog 150, ATS Pulse Flow Manifold, BD Special, SMARTY SR POD, ARP Studs, T&C WILD Fuel Rail, T&C CPRV, II Dragon Fire 85% CP3, II 100HP Nozzles, Built 48RE Trans.....
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08-12-2004, 04:36 AM
Post: #5
 
Also, to get a general estimate of the total surface filtering area of my stock sizzed filter, can't I just take the size of the filter:

-13.5" x 6.5" x 1" and = 87.75 square inches

Right? I think that it is.

Now, all I need to do is it figure out what CFM this size filter is capable of flowing.

I want to say it is somewhere in the 520-540 CFM area. A 10"x2.75" round filter has 86.35 square inches of filtering area and it flows 520.69 CFM.

A slightly larger 10"x3" filter round filter has 94.2" square inches and flows 555.97 CFM.

So, can I a$$ume that it will be somewhere between 520 CFM and 555 CFM?? The average comes out to be 537.5 CFM.




04 QC/LB, 4WD, 305/555 HO CTD, 37x12.50/H2, 6 Lift, MBRP 5", GDP Power-Flo, GDP Air Boss, GDP Grid Delete, IceBox Intake, Air Dog 150, ATS Pulse Flow Manifold, BD Special, SMARTY SR POD, ARP Studs, T&C WILD Fuel Rail, T&C CPRV, II Dragon Fire 85% CP3, II 100HP Nozzles, Built 48RE Trans.....
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08-12-2004, 05:13 AM
Post: #6
 
I think you have to factor in all the pleats(surface area). I think it is much more difficult to figure out than you think. Dunno




Clayton
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08-12-2004, 12:12 PM
Post: #7
 
Quote:On 2004-08-12 04:36, LPD111 wrote:

-13.5" x 6.5" x 1" and = 87.75 square inches

Umm, you figuring volume cause inch*inch*inch is cubic inches...a volume of the area the filter exists in, not the volume it can flow.

You would need to know the number of pleats of the filter (to figure out the total area of filter media) and average flow per given area that particular filter media will flow, and size of the filter to figure it out...I mean think about it, a K&N will outflow a stock filter of the same size. This ain't nearly as easy as you think it is.

steved




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08-12-2004, 01:59 PM
Post: #8
 
you gave volume not surface area, its sorta like the surface area of a golf ball, all the dimples made the surface area larger. well the filter has ridges on it which the only way to tell the surface area would be to take the damn thing apart, unfold it all and lay it out flat...

and the CFM flow rating for a filter is different for each brand filter....

and what the hell are you trying to figure this out for...

its like asking how many licks it takes to get to the center of a tootsie roll pop.... no one cares because the center taste like crap.




Plaque is a figment of the liberal media and the dental industry to scare you into buying useless appliances and pastes. Now, I\'ve heard the arguments on both sides, and there is nothing to convince me of the need to brush your teeth.
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08-13-2004, 06:59 PM
Post: #9
 
Quote:On 2004-08-12 13:59, SalvagExpert wrote:
and the CFM flow rating for a filter is different for each brand filter....

Yeah I kind of figured that. I emailed Accel (Kool Blue), Holley (Power Shot), K&N, and Amsoil. None had the specific CFM specs on the exact fit drop in replacement panel filter for my truck. Accel was the only company to state "ours typically flow 100 CFM better than our competitors." Okay, but how much CFM total is it? Anyways.......

>>>and what the hell are you trying to figure this out for...

Just trying to figure out what the engine requirements are CFM-wise and then trying to figure out what the stock filter flows, and if the stock filter is 'choking' the engine. I already know my TB is flowing enough CFM for the engine to breathe efficiently. This will then help me determine if I want to spend the $40-$50 on a drop in high flow panel filter (K&N, Accel, Holley, etc) or if I will have to go to an aftermarket setup; either being a cone style or a 14" round style setup. The 10" and even 12" round filters do not flow enough CFM unless you want to run a 5" tall filter setup. Also, Intense Performance makes some really nice setups, whether in the open element round style or the cone style setups. Plus they are very helpful with answering questions, and there prices are good too. Their 7" PowerStack cone filter flows 1272 CFM!!!

14" Round Filters:
-14"x2.5" K&N flows around 662 CFM
-14"x2.75" K&N flows around 728 CFM
-14"x3" K&N flows around 795 CFM

Cone Style Filters:
-6"x9" cone: 1017 CFM
-5"x"7" cone: 659 CFM

KN 8" Cone #RE-0810 flows 833 CFM.
KN 4.5"x7" Cone #RE-3130 flows 528 CFM.

There are a TON of K&N cones out there, I mean a TON!!! I just want to match up my TBs CFM flow rate with a filter setup that is around 900-1000 CFM. I do not want the engine to starve for air, like I am sure it is right now with my completely stock setup and a paper Fram filter. If I am going to spend the money, I want to do some research and find out what will work the best for the money I want to spend. Plus, this CFM measurements and flow rate requirements are interesting to learn about.

Everyone thinks that the stock setup draws cool air from the front of the truck, since it has the large rectangular box ontop of the TB and then has the plastic tube running to and into the passenger's side fender. Has anyone actually traced where this tube draws this alleged 'cold air' from?? I believe it still comes from the engine bay/compartment!




04 QC/LB, 4WD, 305/555 HO CTD, 37x12.50/H2, 6 Lift, MBRP 5", GDP Power-Flo, GDP Air Boss, GDP Grid Delete, IceBox Intake, Air Dog 150, ATS Pulse Flow Manifold, BD Special, SMARTY SR POD, ARP Studs, T&C WILD Fuel Rail, T&C CPRV, II Dragon Fire 85% CP3, II 100HP Nozzles, Built 48RE Trans.....
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08-13-2004, 07:19 PM
Post: #10
 
well you certainly have... alot of.... free time? Very Happy
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