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The trick seems to be to run enough filter surface area not to measurably restrict.
For example, Holley ran a test in 1971 of air flow through a carb.
No air cleaner 713 cfm
Chevy hi-perf open element cleaner 675 cfm
Same as above but with two filter elements stacked 713 cfm.

They didn't publish the hights, but the point is once they had enough area, the restriction was the carb. (Mike Urich and Bill Fisher Holley Carburetors & Manifolds 1987 edition page 71)

Another thing to consider along the line of what Mr P was describing is the impact on the bowl vents. With Holley type carbs the vent could be placed into a pressure stream, or in a weird turbulent area and that can mess up the fuel curve. A ton of ideas on modifying Bowl Vents shared at Racing Fuel Systems.

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Been installing an 11/32 brass sleeve over the bowl vents and I drill 4 holes in em and they work. No more pulling fuel up the tubes and the top of the carb`s cleaner. They work for those situations like mine were the lid touches the scoop or is real close.........

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hey Dom don't know if you would be interested in this air filter. i found it while doing research on some air filters for my tunnel ram. it says you don't need a base or air filter lid with this one. its said its for people that don't have a lot of under hood room.

http://www.r2cperformance.com/holley-dominator-air-filters.aspx

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Thankxxx man and cool stuff............. I got a Wix racing 3 1/2" air filter and after a few tweeks, the hood fits tight w/no lid just the rubber on the filter against scoop so we`ll see how it runs and how/if the WB see a difference good or bad.

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Not sure if running a smaller (more restrictive) filter setup on the street, and switching out to something more of a "bird and rock catcher" screen only at the track, is a viable approach... or if that's simply fooling myself.

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1. ... 'cuz I was hoping for a comment or two in response to my last paragraph.

2. Where can flow test results for the Wix racing filters found? All I've noticed is the parts listings on Summit, et al, simply say "flow 1000+ CFM"... but it's the same "spec" regardless of size.

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2. Where can flow test results for the Wix racing filters found? All I've noticed is the parts listings on Summit, et al, simply say "flow 1000+ CFM"... but it's the same "spec" regardless of size.

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2. Where can flow test results for the Wix racing filters found? All I've noticed is the parts listings on Summit, et al, simply say "flow 1000+ CFM"... but it's the same "spec" regardless of size.

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Just came across this thread on another forum: http://forums.tccoa.com/showthread.php?t=15773

Even though it's from 2003, the data is still valid IMO and the preface by the poster on the test methodology is also interesting.

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First off, THIS is the reason I joined Moparts and a select few sites because of valuable info like this post is getting not squabbling bs like grade school kids in the sand box..............I agree about the 1000+ cfm in different sizes and would like closer more accurate data than that. Think I`ll call em.............

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2. Where can flow test results for the Wix racing filters found? All I've noticed is the parts listings on Summit, et al, simply say "flow 1000+ CFM"... but it's the same "spec" regardless of size.

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Just came across this thread on another forum: http://forums.tccoa.com/showthread.php?t=15773

Even though it's from 2003, the data is still valid IMO and the preface by the poster on the test methodology is also interesting.

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First off, THIS is the reason I joined Moparts and a select few sites because of valuable info like this post is getting not squabbling bs like grade school kids in the sand box..............I agree about the 1000+ cfm in different sizes and would like closer more accurate data than that. Think I`ll call em.............

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I think if you call them your gonna get some bogus
number.. IF they even know... you would be talking
to a salesman... I agree.. I would have figured a
larger difference from a 3" to 4"... something just
doesnt sound right

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What if the measurement/test was thru say 1000cfm carb or something else that gave an upper limit to the flow?

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If thats the case then a lot of the data might be invalid ..
who is to say that choke point didnt hold back flow
on some of the 3" stuff

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If people want to use the K&N formula - then this s how u calculate the surface area of a round filter.

Its circumference x height - Plug in the diameter into this calculator and itll tell you the circ.

Then x by height -

http://www.csgnetwork.com/circle_sphere_area_calculator.html

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If people want to use the K&N formula - then this s how u calculate the surface area of a round filter.

Its circumference x height - Plug in the diameter into this calculator and itll tell you the circ.

Then x by height -

http://www.csgnetwork.com/circle_sphere_area_calculator.html

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David Vizard says you need to adjust the height of the filter to account for the top & bottom molding and edge effects. So, your 3" filter calc really should be more like 2-3/4" (or whatever a particular filter measures) when you're trying to come up w/ effective surface area.

Also, for those who question the data I found and posted from tests performed elsewhere, no problem. But if you feel the need to pi$$ on the results, you should probably dig up your own data or -- even better -- conduct your own tests to (in)validate it.

At least I took the time to try and find something more than just a bunch of opinions on the subject.

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Hey Brad........."what" you really need to eat a Snickers........"why" because you`re not yourself when you don`t........ and, I used to wake up EVERY single day pissed off and ready to kill but I found internal peace and my Chi is looken better also. CHILL..........you have great info and I APPRECIATE IT BRAD.................

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..."what" you really need to eat a Snickers........"why" because you`re not yourself when you don`t........

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