Building your Own Sheet Metal Intake

[hellotbone]

Thanks for the uuuuhhh information, I am going with an intake very similar to magnus except with no stacks, for one they are alot of work to machine and another its up in the air if they work or not. As you can see Jims intake has none and it cut what .4 or something seconds off thats enough for me. I will be starting tonight or tomorrow milling out the flanges for the head and the TB. I decided to make my own since I can.

 

[hellotbone]

Material list for starters

Tig Welder I have a Lincoln Precision Tig 185

Head Flange 1/2" x 3 1/4" x 18" Long piece to make the flange

TB flange 1/4" x 4" x 3 1/4" Flate Plate for the flange

Plenum 16" Long x 14" wide to be bent up 4" high tapering to 2"

Runners 6" runners from 2 1/4 OD tubing.

 

[DSMJim]

Thanks for the uuuuhhh information, I am going with an intake very similar to magnus except with no stacks, for one they are alot of work to machine and another its up in the air if they work or not. As you can see Jims intake has none and it cut what .4 or something seconds off thats enough for me. I will be starting tonight or tomorrow milling out the flanges for the head and the TB. I decided to make my own since I can.

Exactly .4 off my 1/4 time from 12.59 to 12.12 and from 110mph to 114. so .4 and 4mph which absolutely no changes before and after.. Just for the record...

 

[anconover]

really not looking to argue a point, but magnus has done the most R&D on the intake manifold IMO. Its shown one of the most gains of an intake mani as well. They use velocity stacks. They only charge extra when u want the CNC 180* thats on the SPL mani's.

 

[ISUJakey]

It may also be worthwhile to glance over the new AMS SMIC as from everything I've read, they are having overwhelming success with it. What is rather ironic also is that a local gentleman from the Twin Cities has been working on his own SMIC design for a while and it turns out that once AMS went public with their design, the two designs are rather similar. I would say that both differ a fair amount from the Magnus also but I'll leave that up to your own opinion. Of course copying either of the designs would not be cool in the least but they may stimulate some ideas for your own manifold.

Information: http://www.dsmstyle.com/forums/showthread.php?t=7042

 

[DSMJim]

really not looking to argue a point, but magnus has done the most R&D on the intake manifold IMO. Its shown one of the most gains of an intake mani as well. They use velocity stacks. They only charge extra when u want the CNC 180* thats on the SPL mani's.

Your absolutely right. What people here fail to realize is that picture I posted on the first page is inside a mangus manifold. Those ends are flared out more than that picture shows. That is a velocity stack and works as such. Putting in a fancy looking machined one is not going to help anymore. If you really must have 180* stacks to sleep better at night, they are available for $200.

 

[hellotbone]

I know where I'm going with this now so I will take pics and post back as it comes togeather.

 

[hellotbone]

Here is the flange in layout Im fully machining it by hand not on a CNC mill.

 

[hellotbone]

In the mill

 

[babell2]

Excuse me for being off topic but
"Does anyone else here have tool envy yet?"
I DO!!!

 

[donk]

i do too , you damn Americans have everything!!!!
best regards Alfred

 

[hellotbone]

Damn American's have everything??? IM A CANADIAN EH

Here is a picture after I milled it out still have to finish the radious on the ports, and also cut the final shape from the square blank.

 

[zachakagoat]

Nice job man I could only dream of having that kinda skills to make this stuff. Who cares if the Magnus manifold is better he WANTS to make his own and make it his way. You gonna rag on the guys that have PVC intakes or homemade MBC now ?

 

[suicidal2af]

Exactly .4 off my 1/4 time from 12.59 to 12.12 and from 110mph to 114. so .4 and 4mph which absolutely no changes before and after.. Just for the record...

And swapping my t25 for a 14b will cut a few tenths off my 1/4 and add a few mph on. No reason to look into 60-1's, I 'spose.

You can't really justify and argument like this by saying x mod gave y power. Wonderful; that speaks great for your manifold. Problem is, that says nothing about a mani with velocity stacks.

As far as this argument goes, stacks probably make little to no difference -- in a forced induction application. When you're operating at positive manifold pressure, as long as you don't have a design that introduces turbulence, you're not really going to see any benefit from it.

However, in an NA application, there will more than likely be a noticeable gain, especially at higher power levels. I'm sure most people here are smart enough to draw conclusions about that if they know what a velocity stack does.

 

[DSMJim]

And swapping my t25 for a 14b will cut a few tenths off my 1/4 and add a few mph on. No reason to look into 60-1's, I 'spose.

I may give you this one if you go from 12.5 to 12.1. An intake manifold taking almost half a second off a mid 12 second car is a good increase in power. I never said it was due to any particular design feature of the manifold. Comparing a turbocharger to an intake manfold for an increase of power is an assinine comparison.

You can't really justify and argument like this by saying x mod gave y power. Wonderful; that speaks great for your manifold. Problem is, that says nothing about a mani with velocity stacks.

Go back to page one. The mangnus manifold has stacks. The picture I posted shows them. Those are velocity stacks. They do not have to have a 180deg lip on them to be a velocity stack. The entire runner is technically a velocity stack because it tapers so much down to the port hole in the flange as well.

 

[hellotbone]

Well go the flange mostly done now I just have to clean up the corners with the die grinder. I have hit a snag getting the material to make the runners for some reason no one in our area carries 2" O.D 3/16 wall tubing to make the runners from so I have to hunt around a bit I know a scrap metal guy Im going to see tonight. Othen then that I just need to use the brake to bang out the plenum and I have to weld it no biggie should have something done towards the end of the week.

 

[hellotbone]

Well I have hit a small snag. I have the plenum built along with the flanges and bottom and end of the intake. However I cannot anywhere locally find material to make the runners of.

I need 2 1/4" OD thin wall aluminium tubing about 1/8 - 3/16" wall. I can't find it anywhere I have called everyone around with no luck and to special order it I am better off to buy a magnus intake.

 

[DSM90AWD]

I need 2 1/4" OD thin wall aluminium tubing about 1/8 - 3/16" wall. I can't find it anywhere I have called everyone around with no luck and to special order it I am better off to buy a magnus intake.

$7.72/ft on eBay

 

[4Restore]

Well I have hit a small snag. I have the plenum built along with the flanges and bottom and end of the intake. However I cannot anywhere locally find material to make the runners of.

I need 2 1/4" OD thin wall aluminium tubing about 1/8 - 3/16" wall. I can't find it anywhere I have called everyone around with no luck and to special order it I am better off to buy a magnus intake.

http://www.aircraftspruce.com

03-38310-4 6061T6 TUBE 2-1/4X.125 4FT 31.600 $31.60

Great resource place with fair prices.

 

[DSMJim]

Where are the pics bi***?

 

[hellotbone]

Im on it Im on it. I was trying to find it local great ebay link Im gonna order up 3' and give em a try.

 

[hellotbone]

OK ordered it from that ebay link thanks again for that its $$$ though 52.12 shipped to my door

 

[DSM90AWD]

They're local to me .

Hell I could pick it up for you and ship it to you if would save you some dough.

 

[hellotbone]

Hahah I already paid the hopped up shipping cost of 12.00 to canada.

Thanks for the offer though. Im building 2 anyone want the second I'll sell it for strictly material cost.

 

[DSMJim]

Hahah I already paid the hopped up shipping cost of 12.00 to canada.

Thanks for the offer though. Im building 2 anyone want the second I'll sell it for strictly material cost.

Plus my management consulting fee of $200.