nastychevelle

iTrader: (7)

what should be used to form the runners of a sheet metal intake? and how thick should the flanges be?

i was thinking 1/4" for flanges and .125 for runners?

99345hp

I can think of a couple ways to form the metal for the runners, but Im not an engineer so I dont know anything about the correct taper or anything on them. It also depends on what you are starting out with for material for the runners. Square tubing? Rectangular tubing? Round? Flat sheet metal?

As far as thickness. I would go 3/8" for the flanges and 1/8" should be good for the runners.

If you dont know exactly what your doing you can actually lose power by building your own intake manifold. Volume, flow, velocity, etc... all play a big factor into how the intake will perform.

nastychevelle

iTrader: (7)

i think i might start out with rectangle tubing and mess with the edges to make it resemble the port i also plan to move the injectors higher up in the runners to get better atomization if i end up making one

i will most likely try doing something like a 3.5-4" tube cap the end off with a half spere shaped piece and cut in the runners and buy a TB spacer and weld it on there or make my own TB flange or use a 4" square with runners and a removeable top for easy porting/welding like 2.5-3" long runners and have the injector bungs welded at around 2-2.5" up in the runner (about a .5" away from the plenum depending on runner length)

99345hp

Im pretty sure you will want some taper to the runner. To do that you will have to pie cut the rectangle tubing, close the gap and weld the seam. Im not really sure what moving the injector will do, but I dont think it would hurt.

The rest of your plan sounds pretty good. We made an intake for a 331 hemi at work, but the car isn't finished so I dont know how it is going to perform. It is for 4 2 barrel carbs also, so thats a whole different animal.

nastychevelle

iTrader: (7)

ive read a couple threads about it and in one magazine article about some bigtime engine builder (i cant think of his name) and they do them on there motors and aprerantly had really good gains... sould i start with a 4" aluminum square tubing?

99345hp

for the plenum I think that would be sufficient.

nastychevelle

iTrader: (7)

what about runner length? and what shoud i use to form the runners? i want something where i can get them the same shape everytime

99345hp

Im not sure on runner length, but I know that really effects what kind of power the intake will make. Im pretty sure the longer the runners the more torque it will make.

Forming the runners will be tricky. What shape are you looking for? maybe you can make a wood buck to form them on?

v8pwr

iTrader: (19)

If you have the money you can get billet runners which will be identical and help when you fabricate . Building an intake manifold is not easy or cheap , I hope you can weld .

nastychevelle

iTrader: (7)

my dads been a welder for 25+ years he'll be ok haha and what about like 4" runners?

94zgreenmachine

iTrader: (2)

Where does one get these billet runners from?

Phil99vette

iTrader: (11)

What kind of setup? N/A Turbo SC && RPM range?

Phil99vette

iTrader: (11)

Also, I like 1/2" - 5/8" for the flanges.

94zgreenmachine

iTrader: (2)

I did a little searching.
Intake manifold building article:http://www.popularhotrodding.com/tec...lds/index.html

http://www.enginebuildermag.com/Arti...d_to_wild.aspx

Billet runners: http://www.swartzracingmanifolds.com/runners/index.htm

http://www.williamsenginedesign.com/...tintakerunners

nastychevelle

iTrader: (7)

turbo or nitrous i havent decided yet if it was nitrous i wouldnt use 16 injectors rpm up to 6500