Intake Manifold *Revisted With Ideas and Thoughts"
 

I'm starting to think of fabbing a new Intake Manifold and wondering what is better.

I know Short Runner is good for top end (right?) and Long Runners are good for bottem end(i think).

If I'm going to be usings a .60/.63 on a Cammed and P&P DOHC ZC at about 18psi after my build up, which style am I going to benifit from most?

Re: Intake Manifold
 

you are probably going to want a larger plenum for boost. that means shorter runners i'd think.

make sure you post some design ideas before you make it josh!

Re: Intake Manifold
 

Oh it will definitely be modeled in Inventoror Solidworks and analyzed first, if I have time!!!

Plus Aaron, I'll probably call on you for a throttle body flange and so forth.

Re: Intake Manifold
 

i wish i knew what all was envolved in IM making,i understand turbo manifold but thats it :(

Re: Intake Manifold
 

I don't know much, but that why I do it, To Learn.

Re: Intake Manifold
 

i guess idk even know where to start,and what kinda factors to take into consideration....wanna help? :)

Re: Intake Manifold
 

maybe pick up an IM off a factory turbo'd car (IE: DSM :P) and see how it's designed to give you some ideas....

Re: Intake Manifold
 

the thing that im unsure of most would be how you would get vacuum ports and whatnot mounted...

Re: Intake Manifold
 

Ah you can do anything from welding in little tubes to tapping in some brass fittings.

I'm most likely going to take a honda Factory IM, cut it right behind the injector bungs and mounts, Port that out and tapper it nicely to the head, the make it off of there. I don't have enough experience yet with making things like that and I want everything to still fit together nicely..

Re: Intake Manifold
 

Box pleunm is your friend plus it will be the easiest to cut and set up.

Re: Intake Manifold
 

Why is a box plenum better? I don't doubt you, just curious if youhave info on it?

Re: Intake Manifold
 

id assume a box plenum is just a recatngular shapped plenum as opposed to cylindrical shape...

Re: Intake Manifold
 

.

Re: Intake Manifold
 

very nice man

Re: Intake Manifold *Revisted With Ideas and Thoughts"
 

Well as few may notice in posts about IM I'm thinking of fabbing my own. In my searches for aluminum velocity stacks I was linked to a post on H-T for Steel IM and I was wonder what peoples thought on a Steel IM would be.
http://www.honda-tech.com/zerothread?id=1369010
I like the idea due to the fact that It would be easier to fanricate myself in my shop, and materials are a little easier to come by.

They had a good instruction page linked too.
http://www.sdsefi.com/techinta.htm

The site above has alot of other good info on fabbing Turbo manifolds and tuning which I'm sure people have found before.

Re: Intake Manifold *Revisted With Ideas and Thoughts"
 

Be sure you angle (prefferably curvve) the section for the throttlebody around 33-40* off center. Be sure to give an inch or two of space after the last runner. (Most opposite of the throttlebody) Otherwise distrobution will be uneven.




Build a huge plenum. Best thing you can do. FI loves a huge common area.

AFA the runners, N/A has to have a balance between small diameter promoting high velocity charge speeds, and having large runners that can flow more with less effort. Go to big, or too small & power suffers. Same for head porting.
The runners also should be tuned to length. That way the sound pressure wave will bounce back through the intake & with the right timing(length), you can catch a returning sound pressure wave to shove air into the cylinder.


All of this is completely different when you're shoving air into the engine. The head & intake runners can be grossly enlarged (If you dont' mind loosing power out of boost). having the shortest runners possible also helps.







A lot of times, the easyest thing to do is saw the stock runners off & simply port them very large. Then build your own intake plenum.


Attachment 37564


Spend a couple of weeks griding & polishing, then spend a week with a tig welding the alu together & you wind up with something like...

http://www.thefilehut.com/userfiles/...e/cameng6e.jpg\

Re: Intake Manifold *Revisted With Ideas and Thoughts"
 

Wow that is one sexy and Flashy manifold.

Re: Intake Manifold *Revisted With Ideas and Thoughts"
 

That IS pretty dang cool. How effective is a new IM or even just cutting, porting, new TB and rewelding the stock back one together? Is it a project worth taking on?


JP

Re: Intake Manifold *Revisted With Ideas and Thoughts"
 

On ours, nothing N/A. FI, 15-25bhp so far depending on how much you're shoving in. (So far...)
Keep in mind that's on a Toyota v6. They're ---- retentive about mods. Short of head porting, or a good y-pipe, they take mods, laugh at them then call you a ------- idiot for trying. LoL! Nothing makes power on them. Such a pain in the ass. But it does save money 'cause you don't have to buy/make much LoL!

So that 15-25bhp is really not something people with other engine's can compare against.

Re: Intake Manifold *Revisted With Ideas and Thoughts"
 

wier, i like the built in velocity stacks

Re: Intake Manifold *Revisted With Ideas and Thoughts"
 

Well I was thinging Steel, because of the inexpensive alternatives for velocity stck and what not. I know you can make them Aaron, but Solid Billet Start is not cheap. I found a VW Bug Site that sells size ranges from 35-48mm for 30.00 A pair. Spun Aluminum.