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Diy; The Hood Hack.

403_r32

By 403_r32,
in Tutorials / DIY / FAQ

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403_r32 Apprentice

403_r32

Posted
Posted (edited)

Taken from s2ki.com forums. (Yes, there are Honda pictures in here)

*disclaimer* I take no responsibility if you mess up!

I wanted a vented hood for three reasons;

1. To let heat (from header, engine, & radiator) escape from engine bay

2. To get cooler air into intake

3. To use the low pressure area above the hood to help extract air from under the front of the car thereby increasing velocity under the splitter and floor of the nose which should increase downforce.

Why not buy a carbon fiber vented hood? The affordable knock-off carbon hoods are heavier and less stiff than the stock aluminum hood. I believe the stock hood weighs 14 pounds. The high quality "authentic" hoods (cwest, mugen etc...) cost a bundle and still need to be painted unless you are going for the carbon look. Some if not all composite hoods require hood pins for high speed use. Oh yeah, and I'm cheap. I planned on venting both sides but ran out of time and decided I like the look of just one side. Still debating.

Here's my solution:

1Pro_Autosports_Vented_Hood_1.jpg

How to build your own:

Please use appropriate safety equipment and don't screw up.

Yes, you are about to cut holes in a perfectly good hood so be prepared.

Remove the hood and the hood liner and support it upside down on some padded saw horses.

Make templates by laying paper over each support hole you plan to cut and trace the edge (use the pencil rubbing technique). Use the templates to cut out some perforated aluminum (clean and paint the both sides of the aluminum). http://www.mcmaster.com/

2Perforated_Sheet.jpg

Use a 3/8" spacer against the hood support edges to draw the hole shape. I left a 3/8" lip for mounting purposes.

Using a UniBit, drill a hole in each corner.

3Hood_Prep_1.jpg

Using an air saw, cut out the shape from the under side - leave a small gap to finish off with sanding.

Use a sanding drum on a die grinder to smooth to shape. I tried using a sandpaper wheel on an angle grinder but it gets too hot and the paints starts to peel back.

4Hood_Saw.jpg

Once the shape is close, flip the hood over and apply masking tape on the top side all around the new openings.

Use wet dry sandpaper to smooth the cut and feather the paint. The masking tape is there so if you slip with the sandpaper, you won't scratch up your hood.

5Pro_Autosports_Vented_Hood_2.jpg

Lay 3M double stick tape used for moldings/body work on your 3/8" lip and trim with a razor to fit just inside the cut out (find it at automotive body shops).

Use a fine paint brush and carefully paint the exposed edge with factory touch up paint.

Install perforated aluminum and your done. I used some small sheet metal clips to hold the perforated aluminum in place just in case the double stick tape failed due to engine heat but I ran a full track day without them and everything was fine.

6Pro_Autosports_Hood_Vent_11.jpg

7Pro_Autosports_Hood_Vent_12.jpg

Edited by 403_r32
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https://www.sau.com.au/forums/topic/177820-diy-the-hood-hack/
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unarmed_skyline Experienced

unarmed_skyline

Posted
Posted

that looks tough as, would look way better with bost sides done but then agian may be too busy, ohh btw if your in melb and ever need any geniune parts for your s2000 pm me, i work in spare parts at a Honda dealer, i dont mind helping out a fellow member, even if oyur not in melb and think your getting ripped pm me ill let you know.

cheers

jarrod

403_r32 Apprentice

403_r32

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Well, I guess you'd really have to have steady hands if you dont want to respray the bonnet, nevertheless make a mistake! Getting a straight cut is probably the most difficult part. Sanding/feathering down the edges may be a bit tedious, but as long as you take off a fairly even amount and the edge retains an even bevel, the touch up paint would suffice.

The s2k hood was done as I said, just touched up around the edges, and as far as I'm concerned it looks pretty damn good :P As long as you have a straight cut to begin with, and have it all masked off properly there shouldnt be any problems!

Getting more air to run around the iron torpedo of a block will always help lower temperatures. Every little thing helps.

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