2" Cowl Hood BBC - Does 14x4 Filter fit? - Team Camaro Tech
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post #1 of 17 (permalink) Old Sep 4th, 19, 04:01 PM Thread Starter
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Question 2" Cowl Hood BBC - Does 14x4 Filter fit?

Hey guys,
simple question (i searched the forum but didnt find specific answers):

Does a 14x4 Filter Element fit under the Stock 2" Cowl hood of an 67-69 Camaro with Big Block and Stock Cowl Induction Air Cleaner Assembly? Is it ok if it protrudes into the hole of the hood?

Stock Filter height is 14x3, so its just an inch more, but:

The additional inch gives room for a Stubstack and also I would use it with an K&N X-Stream Lid.

I got an Edelbrock Performer Intake which is about stock height. RPMs and Air-Gaps are higher.

Also: My whole Engine seems to be shifted slighty so that Edge of the filter almost aligns with the edge of the Hood hole.. Do any of you experience the same?

Even more: Does the X-Stream-Lid work positively in a Cowl Hood setup or is it counterproductive? I would like to know all your guys 2cents to this topic.



Thanks in advance for your help!

Last edited by Harris Roc Malouda; Sep 5th, 19 at 01:08 PM.
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post #2 of 17 (permalink) Old Sep 4th, 19, 05:41 PM
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

BB is shifted over. My SB with 4" and Victor Junior protrudes into the opening with a 2" drop housing.
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post #3 of 17 (permalink) Old Sep 4th, 19, 05:48 PM
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

The X-stream-lid will work great with the cowl hood,I had one on my 69 for years.Engine Masters show did a test on these lids & they do work.
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Last edited by Robert Murray; Sep 5th, 19 at 01:26 PM.
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post #4 of 17 (permalink) Old Sep 4th, 19, 06:04 PM
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

Yes, it will work, depending on what intake manifold you have. I have a Weiand Stealth intake manifold on top of my 461 BBC with a stock 2 cowl induction hood and the standard factory drop base open element air cleaner base and it clears the hood no problem.
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post #5 of 17 (permalink) Old Sep 5th, 19, 01:24 PM Thread Starter
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

Thanks for the feedback guys!! Great!

I hear and read this and that:

- the Air Filter shoudnt protrude into the hood cowl because of stream interference vs: its an advantage

- X-Stream Filter destroy air stream (Better use closed ones) vs. they do work well

.. well ..

so i guess i just have to test myself.


What do you guys have to say about k&n's advice to have at least 1.5 inch distance between stubstack and air filter top to make it work?

Doesnt this requirement become irrelevant with an X-Stream lid since it allows air coming in direct above the stubstack? Thus 1 inch or even 0.5 of distance should be enough?

Anyone got some experience with this?




so tomorrow the 14x3 element arrives and i will check if the room situation allows for more.

I actually want a 14x4 filter cause it gives the stubstack some room.

But i want to use a 1 inch spacer as well..

So 1 inch spacer + 1 inch more air filter height might be too much?

Big block life is just big space problem life



Ok here is the video of Engine Masters testing 19 Air Filter combinations... the winner with gaining 3hp over NO(!)-Air-Filter:

A salad bowl

just google:

Air Filter Horsepower Shootout! - Engine Masters Ep. 27

Last edited by Harris Roc Malouda; Sep 5th, 19 at 01:44 PM.
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post #6 of 17 (permalink) Old Sep 5th, 19, 06:43 PM
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

The lids are a waste and lose power. You can get a 1 inch spacer and a 3 inch filter, no way for 4 inch with the spacer

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post #7 of 17 (permalink) Old Sep 6th, 19, 01:04 AM Thread Starter
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

@1971ls6: yeah thats what i mean. Some make good, some make bad experience with these fitler lids.

I suspect its a matter of combination:
When making the lid a filter, you exchange that for flow across the base. This - in my mind - should only have positive results when there is room to breath ontop of the lid: cowl hoods. Whenever a standard hood is used with filtered lids, it should work counterproductive. Making the Carb/Air cleaner suck on the metall hood instead of only sucking in sideways, which is the only way in the first place. Thus just giving up flow potential.

The Engine Masters in Episode 27 made the same experience: Flow from above is better that across base, "as long as there is room/air". Since they tested on the dyno, this situation resembles rather an infinite large cowl hood.

So get this: They taped the 14x3 element off, forcing all the air only through the lid (giving up ALL the flow across the base), result: gain of horsepower.

I will test my setup with and without filtered lid and experiment a little Once i get my AFR monitor i can see whats stabilzing and whats destabilizing air(/fuel) flow..

Thanks for your input!
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post #8 of 17 (permalink) Old Sep 6th, 19, 07:35 PM
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what brand and part # 14x3 air filter does everyone use? I have a wix R filter which states race off road use only.
i looked for a 14x3.5 with no luck.
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post #9 of 17 (permalink) Old Sep 7th, 19, 03:35 AM Thread Starter
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

K&N or R2C Performance offer 3.5 inch heights
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post #10 of 17 (permalink) Old Sep 7th, 19, 04:21 AM
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

Im using a K&N 14x4 filter element.

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post #11 of 17 (permalink) Old Sep 7th, 19, 09:26 AM
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

I used modeling clay on top of my filter lid. Made four pillars of it and closed the hood. It squished down when the hood was closed and I measured it.
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post #12 of 17 (permalink) Old Sep 7th, 19, 02:06 PM
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

Are you aware they make a 3-1/2" tall air filter element ?

https://www.summitracing.com/int/sea...t-in%3A3-50-in

I have a cowl hood and I'm 99 percent sure a 4" tall filter will work if the base is a corvette type drop base.

BTW I hate the look of those filter-top air cleaners.

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Last edited by NashvilleCat; Sep 7th, 19 at 02:17 PM.
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post #13 of 17 (permalink) Old Sep 8th, 19, 04:27 AM Thread Starter
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

Ok some feedback (plus setup stats because everyting is important here)

67 Camaro
69 BBC 396
Edelbrock Performer Intake (Edelbrock Performer 2-0 Intake 2161 = 4.85 Carb Pad Height)
--> For comparison: GM 3933163 Original 68-69 BBC Intake = 5.0" Carb Pad Height
--> For comparison: Edelbrock RPM(Air-Gap) both: 5.22" Carb Pad Height)
Edelbrock 1411 Carb (Conv. to Manual Choke)
1" Spacer
69 Cowl Induction Base/Flange/Seal
14x3 K&N Filter + X-Stream Lid

Result:

Hood closes, but there is probably only 0.25 inch of room left at the top edge of the flange facing the radiator side.

I will try to bend it a very little bit down at the front facing side and then attach the flange seal to it.

I looked into the cowl from behind the main window and can the top of the filter. I guess it could fit a 14x4 filter but then in would almost touch the cowl roof. So i am gonna let it be like this

But i am gonna measure again to make sure..

Last edited by Harris Roc Malouda; Sep 8th, 19 at 04:39 AM.
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post #14 of 17 (permalink) Old Sep 8th, 19, 02:39 PM
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

Quote:
Originally Posted by Harris Roc Malouda View Post
Ok some feedback (plus setup stats because everyting is important here)

67 Camaro
69 BBC 396
Edelbrock Performer Intake (Edelbrock Performer 2-0 Intake 2161 = 4.85 Carb Pad Height)
--> For comparison: GM 3933163 Original 68-69 BBC Intake = 5.0" Carb Pad Height
--> For comparison: Edelbrock RPM(Air-Gap) both: 5.22" Carb Pad Height)
Edelbrock 1411 Carb (Conv. to Manual Choke)
1" Spacer
69 Cowl Induction Base/Flange/Seal
14x3 K&N Filter + X-Stream Lid

Result:

Hood closes, but there is probably only 0.25 inch of room left at the top edge of the flange facing the radiator side.

I will try to bend it a very little bit down at the front facing side and then attach the flange seal to it.

I looked into the cowl from behind the main window and can the top of the filter. I guess it could fit a 14x4 filter but then in would almost touch the cowl roof. So i am gonna let it be like this

But i am gonna measure again to make sure..
You could go to a 1/2" spacer and use the 3.5" filter.

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post #15 of 17 (permalink) Old Sep 9th, 19, 12:12 PM Thread Starter
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Re: 2" Cowl Hood BBC - Does 14x4 Filter fit?

Quote:
Originally Posted by NashvilleCat View Post
You could go to a 1/2" spacer and use the 3.5" filter.
Thanks for the thought..

Actually the reason i go for this specific spacer is that it adapts the square bore edelbrock 1411 to the spreadbore plenum of the performer 2-O.

Theoretically (according to guys like David Vizard, Tom Dufur etc.) It does two things:

1.) it improves low end torque by adding the 4-Holes to the 4 throttle blades. Air-Pulling effect is stronger

2.) the smooth transition from squarebore-holes to spreadbore-holes/plenum activates the so far unused plenum volume, therefore creating high rpm/hp flow potential.

So it should improve both ends of the power curve, bottom by using holes and top by activating the unused plenum volume.

Before, the square bore carb just sat on top of a spread bore. So much unused area, there is no air-flow guidance from the blade-diameter to the plenum diameter.. I hope you get what i am saying.

Unfortunately there are very few 4-Hole Square- to Spread-Bore Spacers..

I wonder why. There are so many people using Performer 2-Os out there with Square-Bore Carbs...

they all dont make use of the huge and wide Plenum surface, that - when adapted via 4-Hole Spacer to the Carb - gives a lot more Plenum volume that actively pulls from the throttle blades.
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