new ebay intake manifold...

[91-gsx]

hey guys, yes there is another intake manifold on ebay. just wanted to bring it to your guys attention(not saying it is good or bad). but check it out, smooth and velocity stacks, and check out the price. lets hear what you guys think.
later
http://cgi.ebay.com/ebaymotors/Mits...33742QQitemZ8054814197QQrdZ1QQsspagenameZWDVW

edit: just got to looking at the runners, they are like 3" long or something!!!

 

[compression]

where might the throttle body go on this particular manifold

 

[Slippi84]

I saw that manifold too. The thing is that's not the actual manifold they seel according to them if you read carefully. I mean that thing doesn't even have a tb flange. I also saw another new one that's made by the same people that are socketing my ecu they're called Rx4speed.com you guys should check it out it looks like the dejon with shorter runners but I think it's steel not aluminum.

 

[alex99gst]

In the description it says that they can weld on flanges for different throttle bodies.

 

[Boosted98gsx]

when will ppl actually take some engineering classes before trying to design something that relies on fluid dynamics? I mean holy hell there are so many things wrong with that manifold it's not funny. So many ways to improve airflow. When will someone that is actually an ENGINEER design one of these manifolds for a decent price?

 

[boostedinaz]

when will ppl actually take some engineering classes before trying to design something that relies on fluid dynamics? I mean holy hell there are so many things wrong with that manifold it's not funny. So many ways to improve airflow. When will someone that is actually an ENGINEER design one of these manifolds for a decent price?

If there is so much wrong with it then tell us. Don't just post that it is bad with nothing to back it up.

 

[ninjai_ruken]

^^^ I was thinking the same thing.

 

[tstkl]

I saw that manifold too. The thing is that's not the actual manifold they seel according to them if you read carefully. I mean that thing doesn't even have a tb flange. I also saw another new one that's made by the same people that are socketing my ecu they're called Rx4speed.com you guys should check it out it looks like the dejon with shorter runners but I think it's steel not aluminum.

dejon=steel

 

[Coup D E'Tat]

Why would anyone buy an intake from Taiwan? I can't imagine the customer service they would have.

 

[MrBoxx]

Well, here's the first thing that's wrong with it:

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I mean, I don't see how it can hold any boost at all with a big hole in it like that.

(note: I know sarcasm doesn't travel well over the Net, but please bear with me.)

 

[staticbrainwash]

Boosted98gsx, I'd like to know as well why you think this wouldn't flow as well as others. Other than how short the runners are (which to my understanding is awesome for top end) maybe the design of the plenum isn't the greatest?

 

[91-gsx]

Boosted98gsx, I'd like to know as well why you think this wouldn't flow as well as others. Other than how short the runners are (which to my understanding is awesome for top end) maybe the design of the plenum isn't the greatest?

it tapers down very smoothly, as upposed to the square ones we are use to seeing. if you look at what else the guys has, he makes insane supra intake manifolds as well. those runners seem short to me, but the price and great, and it makes up for it in other areas. im no expert on welds, but they seem pretty clean to me.
later

ps. his feedback is 100%. they cant be all that bad...

 

[staticbrainwash]

If i was building a mad drag car, i'd check this thing out! But as it sits right now, just an extrude hone will be fine for a street demon.

 

[Slippi84]

dejon=steel

Yeah I know I own one

I was just sayin that for people out there lookin it's not aluminum like most people like to have it's steel I should have said like the dejon but I was comparing it to the rest with the last statment not the dejon.

 

[Boosted98gsx]

This is all from an engineers POV.

1) You do not want velocity stacks protruding into your plenum. Yes, they work wonders on a naturally aspirated car, all they do is create turbulance in the plenum on a force inducted vehicle, and get in the way of the air trying to reach the cylinder. Pressurized air is GOING to go to the path of least resistance. WHY PUT SOMETHING IN ITS WAY??!!

Solution: Create tapers on the baseplate into each runner, so the air can still smoothly enter each runner

2) You do not want a tapered plenum on ANY vehicle. Yes, to maintain velocity in a manifold where ALL runners are open at the same time, you need this, but in a manifold where only 1 runner is open at 1 instance in time, it is not, as ONLY that cylinder will be getting air forced into it from the plenum. If you use a tapered plenum, 1 cylinder is going to have more air over it than the rest causing it to run more lean than the rest.

Solution: Have a constant plenum with equal volume over each runner. There is a REASON NONE OF THE TOP DOGS IN DSM'S RUN TAPERED PLENUMS, BECAUSE PHYSICS/FLUID DYNAMICS SAYS IT'S RETARDED TO DO SO!

3) A) using circular runners which then transform into rectangles and B) do not taper into each runner

Solution: A) Transitioning from a circle into a rectangle takes a lot of energy and causes a lot of distortion in the airflow. B) While tapers in the plenum do nothing, having tapers in the runners are essential to help increase the velocity of the air going into the cylinder, which is important to create the right air/fuel mixture to get an even burn, and also it helps increase the amount of air that actually goes into the cylinder, which is the whole point of a SMIM

DONE

 

[dsm-onster]

This is all from an engineers POV.

1) You do not want velocity stacks protruding into your plenum. Yes, they work wonders on a naturally aspirated car, all they do is create turbulance in the plenum on a force inducted vehicle, and get in the way of the air trying to reach the cylinder. Pressurized air is GOING to go to the path of least resistance. WHY PUT SOMETHING IN ITS WAY??!!

Magnus maniflods work wonders with velocity stacks. Another ebay maniflod, the bulldog maniflod seams to deiver exceptional results and this manifold also includes stacks.

Solution: Create tapers on the baseplate into each runner, so the air can still smoothly enter each runner

2) You do not want a tapered plenum on ANY vehicle. Yes, to maintain velocity in a manifold where ALL runners are open at the same time, you need this, but in a manifold where only 1 runner is open at 1 instance in time, it is not, as ONLY that cylinder will be getting air forced into it from the plenum. If you use a tapered plenum, 1 cylinder is going to have more air over it than the rest causing it to run more lean than the rest.

Again, Magnus proves otherwise... I am absolutely not questioning your engineering ability or profesional opinion. But, it seams that in the real world the oposite has been established as what works well.

I tend to agree with everything you say. But, real world examples have my attention and cannot be dismissed. With your knowledge, can you show us why the magnus does so well even w/ the flaws you have brought out? You'll have my undivided attention and respect.

 

[staticbrainwash]

Another DSM favorite The JMfab smim is tapered as well and also has raised velocity stacks.

I see whats being said about fluid dynamics, BUT why does every other smim seem to defy what you stated about it?

The only real problem i have with this thing is the shape of the plenum (round is great but the inlet esque tube doesn't float my boat), and how short the runners are.

I still say someone should try it out, do a flow bench test and strap it on a dyno compared to a stock intake manny. I'm curious about it. (I'd try it but i don't have any money right now, and the closest awdyno is 3 hours away.)

 

[91-gsx]

im no engineer, but i always thought that the point of having a tapered plenum is for better destribution of air. sense the cylinder at the end needs less area above it to create more vacuum, this way it gets the same amount of flow as the other cylinders. this might not matter under boost sense the intake manifold is being pressurized, but it would probably make a big difference when you are not under boost.
just my .02

 

[Coup D E'Tat]

Why would anyone buy an intake from Taiwan? I can't imagine the customer service they would have.

Am I the only person who looked at where these were coming from?

 

[autronicDSM]

If you go by the shape of plenum and you use one where it doesn't taper, cylinder 2 & 3 would draw the most air if you think about it.

 

[staticbrainwash]

Is that where it's shipping from? Or where the guy who made it is from? And honestly, so it might take a smidge longer to ship, but good service is good service. How do you imideately know it will be bad because it's from taiwan.

 

[Coup D E'Tat]

It's where it's shipping from. He has international shipping quotes. Do you really think a guy in Taiwan will give a damn if someone in America cracks a weld? Plus, you'd be looking for an easy 100+ in round-trip shipping costs.

 

[staticbrainwash]

But if no ones willing to try it out, and experience the guy service for themselves no one will know. You're drawing terrible conclusions based solely on where he's from. If anyone is that concerned, just call it up, or e-mail him about his service and ask some what-if's.

 

[drivemusicnow]

This is all from an engineers POV.

1) You do not want velocity stacks protruding into your plenum. Yes, they work wonders on a naturally aspirated car, all they do is create turbulance in the plenum on a force inducted vehicle, and get in the way of the air trying to reach the cylinder. Pressurized air is GOING to go to the path of least resistance. WHY PUT SOMETHING IN ITS WAY??!!

Solution: Create tapers on the baseplate into each runner, so the air can still smoothly enter each runner

2) You do not want a tapered plenum on ANY vehicle. Yes, to maintain velocity in a manifold where ALL runners are open at the same time, you need this, but in a manifold where only 1 runner is open at 1 instance in time, it is not, as ONLY that cylinder will be getting air forced into it from the plenum. If you use a tapered plenum, 1 cylinder is going to have more air over it than the rest causing it to run more lean than the rest.

Solution: Have a constant plenum with equal volume over each runner. There is a REASON NONE OF THE TOP DOGS IN DSM'S RUN TAPERED PLENUMS, BECAUSE PHYSICS/FLUID DYNAMICS SAYS IT'S RETARDED TO DO SO!

3) A) using circular runners which then transform into rectangles and B) do not taper into each runner

Solution: A) Transitioning from a circle into a rectangle takes a lot of energy and causes a lot of distortion in the airflow. B) While tapers in the plenum do nothing, having tapers in the runners are essential to help increase the velocity of the air going into the cylinder, which is important to create the right air/fuel mixture to get an even burn, and also it helps increase the amount of air that actually goes into the cylinder, which is the whole point of a SMIM

DONE

First off, where did you go to engineering school?

Second, There is NO WAY for you to be able to look at a manifold and know how well it would perform. You would have to do a test like NABR did a while ago to figure out airflow comparisons between manifolds.

AMS, Magnus, and several others put a LOT of research into their manifolds and they came out with VERY similar designs. Slightly tapered runners, rectangular runners, boxier plenums, velocity stacks stickup up into the plenum, etc.

You're also mixing concepts. Intake velocity has little to do with "proper air/fuel mixture". The best way to ensure a good mix is by causing turbulence (Ie ROUGH intake ports in the head). actually Smaller ports increase velocity, and can increase horsepower.

You're also need to think that at the very last stages of the "induction" cycle air is not being "sucked" in by the piston, or "pushed" in by the boost. Its actually just following the air in front of it. If you can increase the velocity in which the air enters the cylinder, more air will enter the cylinder, just because in those last seconds of the intake valve being opened, the air is still speeding into the cylinder. Basically if you are trying to get even more pressure in a cylinder than is in the manifold.

 

[Coup D E'Tat]

But if no ones willing to try it out, and experience the guy service for themselves no one will know. You're drawing terrible conclusions based solely on where he's from. If anyone is that concerned, just call it up, or e-mail him about his service and ask some what-if's.

Sorry, but that thing has a garbage warranty, from some random guy in Taiwan, where shipping is ~$75 each way. He doesn't even show pictures of the intake you'll be getting.

If you think this guy deserves a chance, be my guest, but I'll stick with places that I know will be around tomorrow.