Building your Own Sheet Metal Intake

[hellotbone]

Has anyone attempted to build their own sheet metal intake system similar to a maguns intake manifold? If so did you have positive effects etc... I defiantly have the ability and the tools to do it I just wasn't sure if it will be worth all the effort or easier to just buy one? I have a couple intakes for my car I can use as a jig to build the sheet metal one off of.

Thanks

Also it would be nice to at least buy the flanges from the TB and the head is available online somewhere it would be appreciated to get a link.

 

[GILZTSIAWD]

You should check out a book called How to Tune and Modify Engine Management Systems by Jeff Hartman. In that book it tells you how to figure up runner length and diameter and plenum volume and all kinds of stuff. Gives you formulas on calculating how long the runner should be based on the air being pushed into the head and then the intake valve shutting and the air reverting and bouncing back, but then it has a formula so you can get the length jus right so that when the air is coming back toward the valve it is opening. Its just a really good book with a lot of information and a whole chapter on building a perfect intake manifold.

 

[SethA]

I remember this thread on DIY SMI.

http://www.dsmtuners.com/forums/showthread.php?t=167966&highlight=build+sheet+metal

Seth

 

[theSicKness]

good luck w/ the project....make sure ur welds are good ive seen a couple intake manifolds blow apart due to crappy welding.....
Jesse

 

[sLoGSX]

Go to bottom of pages for flanges...

http://www.jmfabrications.com/dsm.html

 

[DSMJim]

Jamie, you can buy the flanges from Marco, he sells them seperately and he has them in stock for sure.

If you need some measurements for runners and whatnot you know who to call...

 

[ISUJakey]

An oldie but a goodie: http://www.dsmtuners.com/forums/showthread.php?t=23946

 

[hellotbone]

Jamie, you can buy the flanges from Marco, he sells them seperately and he has them in stock for sure.

If you need some measurements for runners and whatnot you know who to call...

I know no worries I would like to find or buy the velocity stocks too.

 

[hellotbone]

OK I have all the specs and stuff to start my manifold I would like to know because it would be more feesable to build 2 at a time would anyone be interested in the other one? Won't be a whole lot my parts cost and maybe 100 bucks for building it so about 200 for a full sheet metal intake?

 

[Lunch_Box]

I am sure you wouldn't have troubles selling one as long as the welds look good and it is a good design.

 

[DSMJim]

I know no worries I would like to find or buy the velocity stocks too.

Don't waste your time with velocity stacks. Just run the runners inside the manifold and flare them out a bit.

Velocity stacks while they look good, have proven to make no (Zero, nada, none, zilch) hp on the dyno...

Companies only offer it because internet losers seem to think that it is better because it looks better and they are willing to pay more for it. It's kinda the same thing as a exhaust manifold with the wastegate from the collector vs. on one runner. Guys argue the shit out of that, and they all have 300-400hp cars . On a 1000hp car, sure, normal cars, not gonna matter. Flame away...

 

[DSM90AWD]

Don't waste your time with velocity stacks. Just run the runners inside the manifold and flare them out a bit.

Velocity stacks while they look good, have proven to make no (Zero, nada, none, zilch) hp on the dyno...

Wow.. and Magnus used to charge $200 extra for the velosity stacks WTF

I always wondered if hacking up a cast 1G manifold would be worthwhile? Figure you have the plenum, and flange already cast (along with all vac nipples).. just fab up some runners of "X" length, weld and go

 

[DSMJim]

Wow.. and Magnus used to charge $200 extra for the velosity stacks WTF

The stacks are really expensive, I doubt he made money on them, if so it wasn't much. They offer them because people will just buy elsewhere if they don't since some guys are dead set on it since they did all the math etc etc..

When you run a business you make parts that people will buy, if they want a particular option regardless of how you feel about it, you offer it. Thats what your in business for.

They may make a difference at a certian power lever or help with a particular purpose like road racing where your on the gas off the gas all the time, who knows. Many major intake manifold manufactures have done dyno's and found no difference, but offer them for the same reason.

 

[Lunch_Box]

Wow.. and Magnus used to charge $200 extra for the velosity stacks WTF

Maybe that's why they include them for no charge now.

 

[DSM90AWD]

They may make a difference at a certian power lever or help with a particular purpose like road racing where your on the gas off the gas all the time, who knows. Many major intake manifold manufactures have done dyno's and found no difference, but offer them for the same reason.

As I understood it velocity stacks work well for NT engines as it helps to artificially speed up the airflow, but when used with compressed air (as in the turbo world) where velocity is already taken care of, plenum size / runner design is much more important.

Did you see that Intake Shootout from last year where a few well-know designs performed less than expected? Wish I could find that page again

 

[RedAllWheel]

Don't waste your time with velocity stacks. Just run the runners inside the manifold and flare them out a bit.

Velocity stacks while they look good, have proven to make no (Zero, nada, none, zilch) hp on the dyno...

Companies only offer it because internet losers seem to think that it is better because it looks better and they are willing to pay more for it. It's kinda the same thing as a exhaust manifold with the wastegate from the collector vs. on one runner. Guys argue the shit out of that, and they all have 300-400hp cars . On a 1000hp car, sure, normal cars, not gonna matter. Flame away...

You have no clue what your talking about, velocity stacks improve flow at the base of the plenum where their are dead spots. And as far as them not making power, what evidence do you have to support that statement. AMS just tested several different one off intake designs, back to back on a dyno in June 05 Modified magazine, and they said hands down the velocity stacks made more horsepower.

 

[hellotbone]

Nice pic Jim I was looking for one like that. No stacks for this guy.

 

[Black95TSIawd]

AMS just tested several different one off intake designs, back to back on a dyno in June 05 Modified magazine, and they said hands down the velocity stacks made more horsepower.

Did they compare the same manifold with and without the stacks or different company's manifolds who have and dont have stacks? I'm pretty sure unless they were the same IE magnus intake with and then without, that it would be hard to tell the difference as plenum design and runner size/length also play a part. Shine some light on me as that i am too lazy to go pick up the magazine.

 

[Ams2gJim]

Did they compare the same manifold with and without the stacks or different company's manifolds who have and dont have stacks? I'm pretty sure unless they were the same IE magnus intake with and then without, that it would be hard to tell the difference as plenum design and runner size/length also play a part. Shine some light on me as that i am too lazy to go pick up the magazine.

Yes, we did test the manifold against a manifold without stacks. Our intake manifold made 10 whp in the mid rang and 20 overall. This was against another well know intake manifold on the market.

Jim

 

[anconover]

jim of jmfabrications also saw better gains from his mani with stacks vs no stacks.

 

[SethA]

Yes, we did test the manifold against a manifold without stacks. Our intake manifold made 10 whp in the mid rang and 20 overall. This was against another well know intake manifold on the market.

Jim


I think what they are asking is whether the stacks alone made the difference. Perhahaps it was another design difference that resulted in the improved performance. It would be interesting to try a comparison of your manifold w/ stacks vs your manifold w/o stacks.

Seth

 

[RedAllWheel]

Did they compare the same manifold with and without the stacks or different company's manifolds who have and dont have stacks? I'm pretty sure unless they were the same IE magnus intake with and then without, that it would be hard to tell the difference as plenum design and runner size/length also play a part. Shine some light on me as that i am too lazy to go pick up the magazine.

Maybe Jim can answer this in more detail... But from the limited info in the article it seems they tested several manifolds they made, back to back with and without velocity stacks and the one with velocity stacks made more power. Also, of course the runner length and dimensions, as well as the plenum size plays a role in making power in different areas for different horsepower levels. But, as far as an intake with velocity stacks vs. one without, the one with made/makes more power.

 

[DSMJim]

You have no clue what your talking about, velocity stacks improve flow at the base of the plenum where their are dead spots. And as far as them not making power, what evidence do you have to support that statement. AMS just tested several different one off intake designs, back to back on a dyno in June 05 Modified magazine, and they said hands down the velocity stacks made more horsepower.

Thats a pretty powerful statement from a guy reading out of magazines.

What im refering to is the difference between what is inside of the magnus manifold shown in that picture vs. stacks. That is why I have shown the pictures.

If you want to PM me directly I will give you more info on what im talking about, however one thing I am not going to do is start a vendor war in this thread. I should have known better than to even speak up about this topic.

 

[ECLIPSE4x4]

however one thing I am not going to do is start a vendor war in this thread.

Your right Jim, it isn't gonna happen

 

[RedAllWheel]

Thats a pretty powerful statement from a guy reading out of magazines.

Not exactly sure what that means, yes I do pick up on tips via. reading, if that helps with your confusion. But I mostly learn through trial and error, so far this year with my new setup on a quest to make power above 8500rpm, I've been through 3 different intakes.