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I guess I'll share with the class, ITB plenum

Posted by Dazed_Driver 
Dazed_Driver
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I guess I'll share with the class, ITB plenum
January 08, 2012 06:09PM
Here's one of the last things I have to fabricate for the rally car. I've got the back carbon fiber end piece attached to the aluminum bit now, and once that's all cured I'll be able to really figure out how I'm attaching the inlet from the airbox.













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Dazed_Driver
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Re: I guess I'll share with the class, ITB plenum
January 08, 2012 06:11PM
I've still gotta figure out how I'm going to actually attach the two halves together, I'm thinking those little flip clip things (like what on an airbox). I also need to get some thin weatherstripping or maybe foam rubber to make a seal.



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phlat65
Sean Medcroft
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Re: I guess I'll share with the class, ITB plenum
January 08, 2012 07:19PM
How about some of the rubber ball in socket things guys use for trunk hold downs? Much less likely to rattle or come loose.

Looks good BTW
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Dazed_Driver
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Re: I guess I'll share with the class, ITB plenum
January 08, 2012 08:08PM
Oh, that's a good idea. I've only ever seen them in the 4inch or so size, do they make a baby sized one? think Mcmaster would have them? (I don't even know what those are called)



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SteveL
Steve Leitch
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Re: I guess I'll share with the class, ITB plenum
January 08, 2012 09:29PM
Search this number at mcmaster.com 1685A13 It seems like a good bet...



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JonArmstrong
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 05:44AM
Did you do any calculations to figure out what volume your plenum needed to be? It looks pretty big.

The runner length and plenum volume work together to generate a resonant frequency which can enhance airflow. So, you typically design the runner length, runner diameter, and plenum volume to tune for a specific engine speed to enhance torque. Since your runner length and diameter are already fixed by using an off the shelf part, you should make sure the plenum volume is in the correct range to enhance these already fixed variables.

See page 23 and beyond in here:

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CB0QFjAA&url=http%3A%2F%2Fwww.not2fast.com%2Fgasflow%2FLecture08.ppt&ei=ydAKT63AKsboggfiu7ivDg&usg=AFQjCNGQ-tw-KBdjU9IWf8GKKgJ_rUNiUA
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alkun
Albert Kun
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 10:57AM
Nice work, Good to see you chipping away at it. Two or three wraps of camo duct tape and that thing will be totally Prodrive.
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Dazed_Driver
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 11:02AM
Quote
JonArmstrong
Did you do any calculations to figure out what volume your plenum needed to be? It looks pretty big.

The runner length and plenum volume work together to generate a resonant frequency which can enhance airflow. So, you typically design the runner length, runner diameter, and plenum volume to tune for a specific engine speed to enhance torque. Since your runner length and diameter are already fixed by using an off the shelf part, you should make sure the plenum volume is in the correct range to enhance these already fixed variables.

See page 23 and beyond in here:

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CB0QFjAA&url=http%3A%2F%2Fwww.not2fast.com%2Fgasflow%2FLecture08.ppt&ei=ydAKT63AKsboggfiu7ivDg&usg=AFQjCNGQ-tw-KBdjU9IWf8GKKgJ_rUNiUA

Yeah, I did. I have a page somewhere bookmarked breaking down the equations, which they got out of a motorcycle tuning book. I've also got another pdf somewhere that is a college dissertation on WRC airboxes (what are the odds, right?) for the Celica, it's like 100+ pages of info.

That airbox is actually slightly smaller than I would have liked, due to size constraints :/ oh well. Maybe version 2.0 will be bigger grinning smiley

EDIT: SKimmed that ppp. Interesting read. I'll have to compare it more to the two sources I used to see where they all differ, and what's the same when I have more time. Maybe I'm right on the money?



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Edited 1 time(s). Last edit at 01/09/2012 11:07AM by Dazed_Driver.
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Gravity Fed
Alex Staidle
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 11:16AM
did you make the carbon fiber ends? curious why you didnt make it a single piece.



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Ascona73
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 11:37AM
Quote
Dazed_Driver
I've still gotta figure out how I'm going to actually attach the two halves together, I'm thinking those little flip clip things (like what on an airbox). I also need to get some thin weatherstripping or maybe foam rubber to make a seal.

When I built the cold air box for my friend's EG33-powered Impreza, I used stock WRX air box clips...he had them around and they were free. Kids toss the stock airboxes all the time.





Opel is a 4-letter word...
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Dazed_Driver
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 12:14PM
Quote
Gravity Fed
did you make the carbon fiber ends? curious why you didnt make it a single piece.

I did. It was easier to go to world market and find a bowl of roughly the right size (diameter, nailed it, unfortunately, the inside of the bowl wasn't a perfect sphere like the outside (save of course for the little "foot"winking smiley was) to use as a mold for the end pieces, vs make a full mold.

Plus, I knew how the back end would be, but the front, due to the inlet, I'm not yet entirely sure where things are going yet.



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NoCoast
Grant Hughes
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 01:16PM
Yeah. Where's air going to come into the plenum from?



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Dazed_Driver
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 02:43PM
Dad dug out an airbox from a suby or mitsubishi last time he was at the pull a part, it fits so well behind the right headlight, you'd think it was stock! That's what'll hold the filter, and then I'll have a little elbow connecting the two. I'll take some pictures. The guy I was supposed to be teaching right now rescheduled, so I have time!



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heymagic
Gene McCullough
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 07:14PM
Quote
Dazed_Driver
Dad dug out an airbox from a suby or mitsubishi last time he was at the pull a part, it fits so well behind the right headlight, you'd think it was stock! That's what'll hold the filter, and then I'll have a little elbow connecting the two. I'll take some pictures. The guy I was supposed to be teaching right now rescheduled, so I have time!

Teaching someone? You? Does it involve small farm animals?
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Dazed_Driver
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 07:33PM
Quote
heymagic
Quote
Dazed_Driver
Dad dug out an airbox from a suby or mitsubishi last time he was at the pull a part, it fits so well behind the right headlight, you'd think it was stock! That's what'll hold the filter, and then I'll have a little elbow connecting the two. I'll take some pictures. The guy I was supposed to be teaching right now rescheduled, so I have time!

Teaching someone? You? Does it involve small farm animals?

Coming from the guy that live in BFE.... We should be checking YOUR place for disturbed animals.

I run Seattle Photography Lessons. I teach Photography and Post Production on Adobe Photoshop/Lightroom and Apple Aperture.



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heymagic
Gene McCullough
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 08:52PM
Quote
Dazed_Driver
Quote
heymagic
Quote
Dazed_Driver
Dad dug out an airbox from a suby or mitsubishi last time he was at the pull a part, it fits so well behind the right headlight, you'd think it was stock! That's what'll hold the filter, and then I'll have a little elbow connecting the two. I'll take some pictures. The guy I was supposed to be teaching right now rescheduled, so I have time!

Teaching someone? You? Does it involve small farm animals?

Coming from the guy that live in BFE.... We should be checking YOUR place for disturbed animals.

I run Seattle Photography Lessons. I teach Photography and Post Production on Adobe Photoshop/Lightroom and Apple Aperture.

Oh...Apple aperture...I knew it would be something kinky... "he, he...he said aperture "(think Butthead voice here)

Are you still doing the gutter thing...er I mean eaves drop as they say in Canadia??
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Dazed_Driver
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Re: I guess I'll share with the class, ITB plenum
January 09, 2012 11:41PM
No, not really. I can run leads for my buddy if I want to, but I quit the corporate retardation awhile ago. My main sources of income now-a-days are Timm Von Derau - the photographer, and Seattle Photography Lessons.

Need something? Or just curious?



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phlat65
Sean Medcroft
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Re: I guess I'll share with the class, ITB plenum
January 10, 2012 12:12AM
We do post production in our dark room! What's this Adobe you speak of? Some kind of building?
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heymagic
Gene McCullough
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Re: I guess I'll share with the class, ITB plenum
January 10, 2012 12:26AM
Quote
Dazed_Driver
No, not really. I can run leads for my buddy if I want to, but I quit the corporate retardation awhile ago. My main sources of income now-a-days are Timm Von Derau - the photographer, and Seattle Photography Lessons.

Need something? Or just curious?


Curious...other than pick at your car building (or lack of winking smiley ) we haven't talked in a long time.
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Dazed_Driver
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Re: I guess I'll share with the class, ITB plenum
January 10, 2012 12:54AM
Ah, yeah. Been busy with lots of stuff (namely planning and starting two businesses and finishing up classes).

I'll actually be calling you soon, I have some questions about my car, so, be ready! haha

But yeah, I quite GutterMaxx in July I think it was, as corporate has their head up there ass. I had a 29.5 percent closing average, most deals on the board, and they were mad because I didn't have enough cancellations. I had one.

Note the "NOT ENOUGH" part. WTF? They want me to push harder? No thanks, happily in the front of the pack, not about to turn into uber douche salesman. I'll stick with helping people solve their problems in the most cost effective way, not trying to sell them shit they dont need.



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heymagic
Gene McCullough
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Re: I guess I'll share with the class, ITB plenum
January 10, 2012 10:24AM
It's pretty amazing how much mid-guided pressure is in the sales world. Anything from the poor clerk at Target being forced to pedal corporate credit cards , the clerk at Sears selling extended warranties on hose clamps, the bank teller who is required to look at your personal acct screen and upsell products , all while trying to do their actual job in an accurate and timely fashion. Yup, much corporate thinking sucks big time.
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Dazed_Driver
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Re: I guess I'll share with the class, ITB plenum
January 11, 2012 12:35AM
Yeah, it was stupid.

Updates!







So the filter lives in that round box, and while there is a hole in the center of the lid, I'm thinking about moving the elbow to the edge of the lid so the bend isn't sooo ridiculous. It's really tight and I'm trying to not have to get a new airbox. I'll get more pics up one I feel motivated to actually manually upload things vs using facebook. My phone decided it no longer wanted to take pictures today... So I can't just quickly upload them, haha.

Steve, I checked out that part number, those look perfect for both the fuel cell and this! Thanks!



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heymagic
Gene McCullough
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Re: I guess I'll share with the class, ITB plenum
January 11, 2012 10:32AM
Not much room for flex. Could you reverse the flow of the cleaner? Come out of the side, up the inner fender and over into the center to the air box? Have the inlet just bend down 90* behind the radiator.
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Ascona73
Bob Legere
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Re: I guess I'll share with the class, ITB plenum
January 11, 2012 12:41PM
Very shortly I will be building an air box for twin Weber DCOE's for a buddy of mine. I decided that due to underhood space restrictions I am just going to use a foam panel filter in lieu of a remote filter. Essentially half the airbox will be an air filter.

I got me some medium and fine Uni flat foam filtration material, and some stainless mesh to help hold its' shape. About $40 worth of material, and lots of surface area.



Opel is a 4-letter word...
http://www.flickr.com/photos/10498579@N07/sets/
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Do It Sidewayz
Chris Martin
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Re: I guess I'll share with the class, ITB plenum
January 11, 2012 01:26PM
Why not just like this?



looks way more bitching.



Chris



Edited 1 time(s). Last edit at 01/11/2012 01:26PM by Do It Sidewayz.
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MeCalledEvan
Evan Horner
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Re: I guess I'll share with the class, ITB plenum
January 12, 2012 12:51PM
You wouldn't happen to be able to dig up that college dissertation on WRC airboxes would you? I would love to take a look at it.



"The more I learn, the more I realize I don't know and have so much more to learn." - Claude Rouelle, Optimum G lecture June, 2011
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