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What is your opinion on letting the air cleaner stick out of the hood?


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#1 rucus01

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Posted 27 January 2010 - 09:24 AM

I currently have a hood scoop on my s30 because my air cleaner sticks up above the hood line. What do you think of just leaving a small hole in the hood for the base of the air cleaner and then just putting the air cleaner on after I close the hood? Do you think this is doable or are there any concerns?

#2 at-jefft

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Posted 27 January 2010 - 09:29 AM

What about a low profile air cleaner? Would that work?

#3 Titus_RacerX

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Posted 27 January 2010 - 09:33 AM

Resist making your car look like sh!t. Add a scoop or a hood bulge to fix it.

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#4 zeeboost

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Posted 27 January 2010 - 09:40 AM

I don't think it looks right on a Z, but I've seen a couple tastefully done on older muscle. Plus, it may not be that great if you get stuck in heavy rain.
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#5 RB26powered74zcar

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Posted 27 January 2010 - 10:45 AM

I don't think it looks right on a Z, but I've seen a couple tastefully done on older muscle. Plus, it may not be that great if you get stuck in heavy rain.


It don't rain in Texas.... :tongue:

#6 rucus01

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Posted 27 January 2010 - 11:26 AM

It don't rain in Texas.... :tongue:

You are right it doesnt rain as much as it did when I lived in Louisiana. I do have a scoop, just dont like how much it blocks my vision. I guess i could see about making something a bit smaller.

#7 rucus01

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Posted 27 January 2010 - 11:27 AM

What about a low profile air cleaner? Would that work?

I have about 1/2" between the top of the throttle boddy and the stock hood, so it would have to be REAL low profile and would provide a great deal of restriction.

#8 Slopoke

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Posted 27 January 2010 - 11:34 AM

My buddy had his like that on his V8 Datsun. We just put a plastic bag over the air cleaner whenever it rained. Looked kind of mean.
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#9 Globerunner513

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Posted 27 January 2010 - 01:29 PM

Joe-Z had that setup on his car. Let me see if i can find a picture...

I hope Joe-Z doesnt mind me posting these for him.


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#10 proxlamus©

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Posted 27 January 2010 - 10:41 PM

Joe-Z had that setup on his car. Let me see if i can find a picture...

I hope Joe-Z doesnt mind me posting these for him.


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Interesting hood louver location.. umm.. you should read up on the aero test results Joe-Z
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#11 Globerunner513

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Posted 27 January 2010 - 10:45 PM

lol to be fair, I think that setup of his is several years old. Not really sure what he's done to the car now.

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#12 piston

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Posted 27 January 2010 - 10:56 PM

my unprofessional opinion on air filter sticking out of hood.----> GAY!

#13 jc052685

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Posted 27 January 2010 - 11:01 PM

my unprofessional opinion on air filter sticking out of hood.----> GAY!


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#14 Globerunner513

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Posted 27 January 2010 - 11:27 PM

I kinda like it actually. Though I'd probably put a scoop over it of some sort.

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#15 zeeboost

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Posted 28 January 2010 - 05:56 PM

It don't rain in Texas.... :tongue:


Good job, way to jinx us :mrgreen:
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#16 rucus01

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Posted 29 January 2010 - 06:38 AM

Good job, way to jinx us :mrgreen:

Good thing I dont have it that way today, its coming down like crazy out there.

#17 T-Bone028

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Posted 02 February 2010 - 12:53 PM

The lines of the Z are something that makes it that much more mesmerizing. Some body mods help accentuate it....but an air filter sticking out of a hole in the hood just doesnt seem right in my eyes.
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#18 nosebleedZ

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Posted 02 February 2010 - 09:23 PM

At least modify a NACA duct from Motorsport Auto to the filter if your going to cut a hole in the hood. Honestly think about it: Z car hood- $400, K&N chubby- $50, this is an easy one. If not sell someone on here the car to save it from ghetto bodywork.....
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#19 Michael

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Posted 02 February 2010 - 09:49 PM

Hoods can be replaced. If the aesthetics of cutting a hole disappoint, it's not too great a trouble to start over afresh. It's not like tubbing the rear or cutting the roof to make a convertible....

One should be careful about extrapolating aero results for overall car aerodynamics, to the flow through an air filter. The middle of a typical hood is a region of local separation, so air flow into the hole would be poor. However, the air filter acts like a local low-pressure region - because, well, air is flowing into the engine. It would of course be better to source airflow into the air filter from near the hood/windshield juncture, but a hole in the middle of the hood is NOT necessarily awful.

Proper air-scoop design is difficult. So I suggest cutting a hole for Version 1.0, and then worrying about an air-scoop in Version 2.0. Also note that an air filter sticking out of a hole in the hood would at least partially alleviate issues of high underhood temperatures reducing intake mixture density. There are ways to solve this in a "clean" installation with no hood cutting, but which approach is simpler?

After much tinkering, my home-built fiberglass hood has a hole in it, for a 14" round air filter case (Chevy big block V8). It is not suitable for the rain, but in dry conditions it is very convenient. I can tinker with the carb without having to remove the hood.




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