DIY: fresh air ducting for stock EG airbox using OEM Honda / Acura parts
12-11-2007, 07:03 AM
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DIY: fresh air ducting for stock EG airbox using OEM Honda / Acura parts
Vehicle tested: '93 Honda Civic Si
Engine: original D16Z6 SOHC VTEC with 124K miles
Existing engine mods: EXEDY Racing lightweight flywheel (10.9 lbs)
Intake set-up: Factory rubber intake tube, factory EH3 airbox (USDM 92-95 Civic airboxes are identical to one another though), stock HONDA green panel filter, modified air ducting
The factory Civic piping that feeds from the resonator chamber has been cropped - leaving a short duct (see diagram below) that fits into the rubber grommet / opening of the original airbox. This works fine, but in an effort to properly route fresh air from my newly-cut bumper cover (opening was made where original fog light once sat), I wanted to make an extension.
I had a spare '94-'01 Integra non-VTEC intake set-up, so I decided to see what I could do using OEM parts. This set-up in it of itself would be awesome to retro-fit into my Civic, but it ain't happening so long as I retain my air-conditioning. There's simply not enough room and the hood won't clear it. Note that the Integra ducting has been "freed" from the Integra resonator chamber. I did this by placing a flat-head screwdriver along the seam of the resonator chamber box and pounding with a hammer to "crack" it open. The tubing then is easily removed.
To modify the Integra piping, I made the necessary cuts using a hacksaw. Follow-up by sanding the edges and getting rid of the plastic burrs.
On the left is my modified Civic intake duct piece. On the right, is the modified Integra piece.
Because the Civic ducting transitions from a slightly oblong shape (as opposed to completely round), the Integra ducting slips over it and can be secured using a hose clamp.
Installed shot. And yes, you really should put your inner fender liner back in place. I have a new one on order from the dealership.
Newfound fresh air.
Probably should add some sort of velocity stack / air horn onto this...
Engine bay shot...
Driving impressions: modifying the Civic piping and ditching the resonator chamber and the additional piping that basically inhaled underhood air was a huge improvement by itself. So adding the Integra air extension tube didn't make a dramatic difference by any means. However, this set-up in its entirety is very easy to do and has performed very well for me. I've debated about larger diameter rubber intake tubes, but with the exception of the factory ITR tube, none of them offer a straight shot. Even the JDM B16 rubber intake tube has an attached resonator / silencer added to it. I wanted to avoid adding PVC caps or similar to eliminate those parts. So for now, I'm sticking with the stock Si / EX intake tube. Great all around power and low-key sound, which was not the case with my P/W: JDM set-up I was running before...
Hope this helps!
Modified by 93_EH3 at 8:26 AM 12/11/2007
Modified by 93_EH3 at 8:28 AM 12/11/2007
Engine: original D16Z6 SOHC VTEC with 124K miles
Existing engine mods: EXEDY Racing lightweight flywheel (10.9 lbs)
Intake set-up: Factory rubber intake tube, factory EH3 airbox (USDM 92-95 Civic airboxes are identical to one another though), stock HONDA green panel filter, modified air ducting
The factory Civic piping that feeds from the resonator chamber has been cropped - leaving a short duct (see diagram below) that fits into the rubber grommet / opening of the original airbox. This works fine, but in an effort to properly route fresh air from my newly-cut bumper cover (opening was made where original fog light once sat), I wanted to make an extension.
I had a spare '94-'01 Integra non-VTEC intake set-up, so I decided to see what I could do using OEM parts. This set-up in it of itself would be awesome to retro-fit into my Civic, but it ain't happening so long as I retain my air-conditioning. There's simply not enough room and the hood won't clear it. Note that the Integra ducting has been "freed" from the Integra resonator chamber. I did this by placing a flat-head screwdriver along the seam of the resonator chamber box and pounding with a hammer to "crack" it open. The tubing then is easily removed.
To modify the Integra piping, I made the necessary cuts using a hacksaw. Follow-up by sanding the edges and getting rid of the plastic burrs.
On the left is my modified Civic intake duct piece. On the right, is the modified Integra piece.
Because the Civic ducting transitions from a slightly oblong shape (as opposed to completely round), the Integra ducting slips over it and can be secured using a hose clamp.
Installed shot. And yes, you really should put your inner fender liner back in place. I have a new one on order from the dealership.
Newfound fresh air.
Probably should add some sort of velocity stack / air horn onto this...
Engine bay shot...
Driving impressions: modifying the Civic piping and ditching the resonator chamber and the additional piping that basically inhaled underhood air was a huge improvement by itself. So adding the Integra air extension tube didn't make a dramatic difference by any means. However, this set-up in its entirety is very easy to do and has performed very well for me. I've debated about larger diameter rubber intake tubes, but with the exception of the factory ITR tube, none of them offer a straight shot. Even the JDM B16 rubber intake tube has an attached resonator / silencer added to it. I wanted to avoid adding PVC caps or similar to eliminate those parts. So for now, I'm sticking with the stock Si / EX intake tube. Great all around power and low-key sound, which was not the case with my P/W: JDM set-up I was running before...
Hope this helps!
Modified by 93_EH3 at 8:26 AM 12/11/2007
Modified by 93_EH3 at 8:28 AM 12/11/2007
12-11-2007, 08:49 AM
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