My intake

Post by **kotomile** » January 01, 2004

I made this awhile back so I figure I'll dig up the pics and show it off...

If anyone wants to know how to make it yourself, go to teamdelsol.com > how to > DIY AEM cold air. It's really actually very simple to do.

Merilious · Post by **Merilious** » January 02, 2004

Not bad DIY job there.

Post by **Nikku** » January 02, 2004

i will stick w/ a stock air box w/ cold air ducting

phan · Post by **phan** » January 02, 2004

looks good. what diameter piping did you use though? it looks a bit small...

Post by **Nikku** » January 02, 2004

phan wrote:looks good. what diameter piping did you use though? it looks a bit small...

it should actually taper up towards the TB anyway

Post by **kotomile** » January 02, 2004

phan wrote:looks good. what diameter piping did you use though? it looks a bit small...

It's 2.5" piping, just like AEM uses for a B16. Besides, the pipe doesn't need to be any bigger than the TB opening anyway, IMO.

Post by **Nikku** » January 02, 2004

kotomile wrote:
phan wrote:looks good. what diameter piping did you use though? it looks a bit small...
It's 2.5" piping, just like AEM uses for a B16. Besides, the pipe doesn't need to be any bigger than the TB opening anyway, IMO.

http://www.clubcivic.com/board/showthre ... eadid=9197

read that thread, my name is "iamgod"

Post by **kotomile** » January 02, 2004

Good information, but I don't really see what it has to do with this. Maybe I just didn't find what you wanted me to see there, but it's a lot of stuff to read. If you're trying to stress that the AEM doesn't make good top-end gains, I won't argue with that. I am not interested in top-end gains much, I build my car with autocrossing in mind. Besides, if I want good top-end for some reason, I can rearrange my intake to be a short ram.

Post by **Nikku** » January 02, 2004

kotomile wrote:Good information, but I don't really see what it has to do with this. Maybe I just didn't find what you wanted me to see there, but it's a lot of stuff to read. If you're trying to stress that the AEM doesn't make good top-end gains, I won't argue with that. I am not interested in top-end gains much, I build my car with autocrossing in mind. Besides, if I want good top-end for some reason, I can rearrange my intake to be a short ram.

it was in relation to piping size and throttle body size

"2. Calculating the Ideal Intake Diameter and Tapered Intakes

What's the ideal intake diameter that will allow enough volume to make power but also be not too big so that it slows the flow speed into the TB?

There is a bend just in front of the TB where the intake attaches to the TB. To allow air flow to "turn" and make that bend without creating more turbulence, some people increase the diameter of the intake just in front of the TB. This slows the flow down just enough to allow the air flow to turn without becoming turbulent. How much of a diameter increase should there be at this critical attachment point?

Nitro at Endyn stated in their archives that the ideal intake diameter at the TB attachment point should create about 25% more cross-sectional area than the TB bore's cross-sectional area. Your TB diameter dictates your intake diameter at the attachment point. Notice how the intake has a step just before it connects to the TB in the above image?

How do you calculate this 25% more area and the diameter you need ?

Basic trigonometry. The area of a circle is:

pi x radius squared

The diameter of a circle = 2 x radius

For a 64mm TB the best value for an intake diameter is 2.8 in.

This makes the Iceman tapered design (from 3.5 in. at the filter opening down to 2.75 in. at the TB) , at least theoretically from a fluid dynamics point of view, better than the constant 3 in. diameter .

Here's a Japanese J's Racing tapered short ram (they call it a Tsuchinoko chamber) which generates more midrange power in a short ram (recall longer intakes add more midrange usually in our discussion at the beginning of the article).

This is 10.59 sec et , 2.1L all motor Honda record holder, Erick Aguilar's massive tapered intake:

Aside: BTW notice the stock ignition (but 2 batteries, one dedicated to just the plugs) and unique oil catch can (no little K&N valve cover breather filter on the champion's car)."

there were some pix but i omitted them here, on a related note cowl induction is an interesting idea

Post by **kotomile** » January 02, 2004

So you're saying I should increase the size right near the TB? Interesting idea. Not sure how I'd actually do that though.