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Old 12-19-2017, 07:38 PM   #1
Stick
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Question Air Delivery System Questions

Couple of questions about our stock air filtering system. I was taking of my stock airbox to change out the vehicle speed sensor, and i realized i dont really have any idea what any of this shit is and i couldn't really find a good explanation on the forums.

Basically there was 1 (or 2) i cant remember large hoses coming off the bottom of the airbox going down toward the front of the car sort of...can someone tell me what it does? Also the small of the 2 tubes that comes off the intake pipe right before the throttle body, does that control idle or something? Im pretty new to the whole car thing dont make to much fun of me lol
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Old 12-19-2017, 07:50 PM   #2
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The two larger hoses go to the air box that is installed in your bumper. It is sort of a stock cold air intake. Instead of pulling the air from the hot engine bay, the stock intake system pulls the cooler air closer to the ground. As for the hose coming off the valve cover, that is to relieve crank pressure.
No need to worry about feeling dumb, just remember there are no stupid questions except the one not asked and we all had to start somewhere.
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Old 12-19-2017, 07:57 PM   #3
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thanks man, do you know the name of that hose coming off the valve cover? id like to order a slightly longer one i feel like the ebay spec intake i ordered wont have the port close enough to the throttle body for the stock hose to reach.

EDIT: actually would it be smarter to keep the stock hoses and just hose clamp the the actual intake onto the stock hose and forgo the cheap piping? seems like that cheap bare metal piping would retain a lot of heat compared to the plastic. or does that not matter. idk

Last edited by Stick; 12-19-2017 at 08:02 PM.
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Old 12-19-2017, 08:27 PM   #4
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Welcome to the forums!

You are correct, a CAI or SRI piping is pretty worthless (especially on a stock engine). The metal gets heat soaked just like the OEM plastic. The only real upside of the metal piping... it looks pretty?


Swapping out the factory air box/filter for any sort of intake system, or as you said just a hose clamped filter on the OEM piping, doesn't do a whole lot in terms of performance.

The upside to a CAI or SRI.
1. It 'cleans up' the engine bay.
2. Gives you a washable filter (no more buying and tossing every so many thousand miles).

The downside.
1. The filter media itself doesn't filter better, it actually filters worse (allows more particles through).
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Old 12-20-2017, 12:23 PM   #5
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dope ill keep all that in mind thanks fellas
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Old 12-20-2017, 02:03 PM   #6
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Quote:
Originally Posted by Jon View Post
You are correct, a CAI or SRI piping is pretty worthless (especially on a stock engine). The metal gets heat soaked just like the OEM plastic. The only real upside of the metal piping... it looks pretty?
The inside of the CAI or SRI is smooth compared to the ribbed inside of the original intake tube. This does flow air much better. Is it a noticeable performance gain... nah, but it's fun to hear it go wooooosh
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Old 12-21-2017, 07:19 AM   #7
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Nice spam there Robb
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Old 12-21-2017, 11:42 PM   #8
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Quote:
Originally Posted by Grumpys93 View Post
The two larger hoses go to the air box that is installed in your bumper. It is sort of a stock cold air intake. Instead of pulling the air from the hot engine bay, the stock intake system pulls the cooler air closer to the ground. As for the hose coming off the valve cover, that is to relieve crank pressure.
No need to worry about feeling dumb, just remember there are no stupid questions except the one not asked and we all had to start somewhere.
The stock intake pulls air from behind the right headlight assembly. The black box in the fender (#7) is a resonator to reduce intake noise; there is no opening in this to pull air from the fender well or underneath. I think all 90-91 models, and 92-93 EX models have pipe #11 running straight from the filter box to just behind the headlight and pipe assembly #14, 16, and 20 running below that. Both pipes have a connection to the resonator. Below 3500 rpm, the valve in #16 blocks the intake but connects the resonator to the filter box; above 3500 rpm it blocks the connection to the resonator and allows the pipe to pull air through #20. For 92-93 DX and LX, they have only pipe #15 which connects the filter box to the resonator; air is drawn in only through #11.

If you leave the connector off the solenoid (#37) that operates #16, the engine will always get air through both pipes. For 92-93 DX and LX; you can replace #15 with 14, 16, and 20 for less intake restriction (or cut a big hole in the bottom of the filter box!).



The breather tube #4 and hose #5 going from the intake duct to the valve cover is part if the PCV (positive crankcase ventilation) system. For an engine with little blowby, as vapor is pulled out of the crankcase through the PCV to the intake plenum, the line from the intake duct (ahead of the throttle body) allows filtered air into the crankcase. In older engines, I think excessive blowby can overpower the PCV and actually push oil vapor back through this line into the intake ahead of the throttle body - which makes a mess of the throttle body.

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Last edited by fleetw00d; 12-22-2017 at 12:03 AM.
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