Another DIY OAI

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Old May 11, 2010 | 06:14 AM
  #1  
AZ442's Avatar
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Another DIY OAI

First off, thanks to the others who have built these and posted.
I was tired of using all that cool air as a fan to blow on the engine. My car did not have the factory air cleaner parts when I got it and I'm way to cheep to spend $1000 to get the aftermarket ones.

I used a 16"x2" alum. ceiling speaker backbox that I found (same as 16"x2" cake pan) 24"x24" alum. sheet to cut the outer ring for the foam to sit on and used the scrap for the Z brackets.

I read a post from Joe somewhere that every 7 degrees you drop the intake air is good for 1 HP. If this is correct, intake air was 200 appx. and now is 70 appx. gain of 18HP

Car runs way better then before.
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Old May 11, 2010 | 06:28 AM
  #2  
stevengerard's Avatar
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wow, very clever, very nice
Old May 11, 2010 | 06:39 AM
  #3  
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Wow - engineering at its finest...
Very nice job - looks nice and you saved a wad of $, too!
And don't forget the weight-savings of the aluminum vs the heavy steel repro parts...

I want to do something similar to Lady... That one tiny snorkle seems too restrictive.
I am running a smaller dia/ air cleaner lid so i can hear the secondaries howl, but do not like bringing in 150* air.

Unfortunately a ram air hood is out of the question...
Oh, well...
Old May 11, 2010 | 07:47 AM
  #4  
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Thanks, I will install drains but we don't drive it if there is any sign of rain.
I held a smoke to the scoops with the hood closed and at a idle and it was sucking it in, at 2000rpm will suck smoke from 12"
Old May 11, 2010 | 07:54 AM
  #5  
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Nice job! As Rob said, engineering at it's finest. Any pics of you making it?
Old May 11, 2010 | 08:09 AM
  #6  
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Originally Posted by OLD SKL 69
Any pics of you making it?
I'm sure that's classified information, dude...
Old May 11, 2010 | 08:24 AM
  #7  
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When I take it back apart I will take some picks.
Old May 11, 2010 | 10:15 AM
  #8  
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I have made my own as well and struggled to find a "box" that was the right size. I like yours a lot.

I ended up buiding it from scratch. The below is a copy of the post i made over on ROP back in March 2008 ...... please excuse if some of it is out of context. I just grabbed the whole thing. The post is here: http://72.22.90.30/phpBB2/viewtopic....fabricated+oai


************************************************** **

Just finished building this today. I will soon treat it to a nice HARDCORE paint job ala Pierre. 67Fire, should i move this post to the paint section after it is painted?
Well i cant say i took the same approach as Norton1 (Steve) but i came in under $20 too. It only cost me the fasteners which dont come cheap these days (used hex button caps and all metal lock nuts around base). I even thought about the Coon *** Ram air setup but never found the part in my area.
Here is the idea that i posted a while ago. The side wall started off as a strip of aluminum about 61" x 5.625" x .030" thk. I bent a 1" flange and than ran the flange through a shrinker. As the flange compresses and shrinks it starts to draw into a circle. Once round i mounted to a base that is .060" thk by about 18.5 diameter.
airbase.jpg
The sidewall was tough to get round using the shrinker along the flange. We have a hand shrinker in the shop and i must have pulled the lever 300-400 times.
Here is the assembled unit
front.jpg

Looking down into it and mounted to the.060 base.
top.jpg

From the bottom and mounted to a .75" drop air cleaner base. The side wall fits tight to the base plate. You can see a couple of spots where i didnt shrink to 100% correct radius show up as a very slight ripple. Its not that bad and probably wont try to get the minor ripples out. They are not visible installed. Black paint might even hide it completely.
bottom.jpg
Sitting on the carb
incar1.jpg
With air filter and top element installed
incar2.jpg
I am going to seal it off to the hood using a universal seal. The bottom of the gasket has u shaped rigid plastic channel, like a door edge gaurd. The top is a 1" thick rubber gasket that will compress nicely against the hood. Its pretty similar to what stock cars use to seal off their air box to their cowl opening.

Once its warm enough outside i will paint it. Cant use etching primer in the cellar !! Dont mind the dirty bay , thats on the spring cleaning list after i repaint the interior.
Old May 11, 2010 | 10:26 AM
  #9  
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BOLDSMOBILE,
The thanks was to you and one other guy the made one from a sump basin. I used your pic's to design this one.

I have found cake pans in the 16x2, 16x3, 18x2 and 18x3. With the edelbrock intake and carb spacer I needed to go a little shorter then most.
Old May 11, 2010 | 11:36 AM
  #10  
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looks good. now you need to make a lid and sell pop corn at the car shows.

lol, i guess it wont run to build heat with a lid. so much for my engineering degree.
Old May 11, 2010 | 11:45 AM
  #11  
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Thumbs up U Should patent these!

Great work guys...very interesting, and looks impessive!
Old May 13, 2010 | 06:09 AM
  #12  
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More Pic's

I took a few more pic's last night.
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Old May 13, 2010 | 08:34 AM
  #13  
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Where did you buy that speaker box? Its a lot cleaner than my build ... no shrinker marks on the bottom and no seam to join on the face.
Old May 13, 2010 | 08:58 AM
  #14  
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I work in the Electrical Contracting business and we had it left over from a job.
The 16"x2" aluminum cake pans are very close and can be had in 16x2,16x3,18x2 and 18x3 I have seen them for sale online and at cooking supply stores, even seen one at Hobby Lobby
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