Okay, like i always do i was browsing ebay and stumbled upon the new OBX intake manifold, it looks just like an awesome manifold, i was wodnering if anyone has gotten one or has any opinions on it, other than hearsay or obx sux.

http://cgi.ebay.com/ebaymotors...36474

it essentially looks like they took the venom intake manifold design...







Modified by Soccerking3000 at 3:40 PM 2/10/2005

 

I would make a good guess in that its all for show, and you will actually lose power if you bolt it on.

 

well for forced induction it might have some good gains... but i dont know

 

its not for a show car, it seems to be a much betetr design than the stock manifold, it has the same design as the venom intake so i dont see why i wouldnt perform similarly to it, and i would most likely powdercoat it black

 

I'd put money on it losing power even in a forced induction application.

 

hmm, so what are the gains of the venom intake manifold if they are almost the same design?

 

I agree with the other dudes, if you don't have forced induction or high compression, i would think you'd lose power.

 

Im just curious, besides undersizing the runners or putting some big restriction in the way, how can you **** up an intake manifold design?

 

i dont know, but some plenums are better than others and such i dont understand how something such as this would perform worse than its "real"counterpart

 

Thats what I'm wondering. If inch for inch its the EXACT SAME MANIFOLD as the Venow, then how in the world does putting the letters OBX on it make it less effective?

 

There is a lot more to designing an intake manifold than just plenum size, runner area, and runner length.

They all must be properly sized for the application. The shape, area, length of a runner is critical, and fractions of an inch means whether you will lose or make power.

I've never really seen any dyno's of an OBX, or a Venom intake that shows exactly how it works. I wish I could have it tested.

The whole combination of how a intake manifold is designed is based on air flow and frequency harmonics. I seriously doubt that a company like OBX, which copies other people's products, actually has the engineering capability to insure that the manifold works properly.

 

i doubt obx has that capability but if they copy a manifold that has been proven to have nice gains on engines and has the reputation to back it up, then wont the obx perform the same, maybe not last as long, but at least have similar gains?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Marauder &raquo;</TD></TR><TR><TD CLASS="quote">There is a lot more to designing an intake manifold than just plenum size, runner area, and runner length.

They all must be properly sized for the application. The shape, area, length of a runner is critical, and fractions of an inch means whether you will lose or make power.

I've never really seen any dyno's of an OBX, or a Venom intake that shows exactly how it works. I wish I could have it tested.

The whole combination of how a intake manifold is designed is based on air flow and frequency harmonics. I seriously doubt that a company like OBX, which copies other people's products, actually has the engineering capability to insure that the manifold works properly.</TD></TR></TABLE>
can u beleive this company makes LSD for d series and b series motors, and there are people on this site who use them, there is a dude on this site who has had one for over a year without anyproblems but i dont know his name, they also have a groub buy going on right now for the lsd on this web site.

 

skunk or obx, either way is a larger intake manifold that will kill your low end torque and give you minimal gains on the top end without mods to compression and/or cams. It would be for show only for your application

 

its a knock off...who cares. if it works it works. that design has a huge plenum with short straight runners. it would be good for high boost applications but horrible for n/a or even low boost. due to the huge plenum an n/a motor would not be able to fill the manifold completely and would create differences in vacuum at different cylendars. its simalar to the jg edlebrock manifold. some people say they are great for na but in reality the design is for fi. usually manifolds like this will make some power at very high rpms such as 7k+ but for most the increase in the powerband is such a narrow band it is worthless and a smaller plenum longer runner design would be better suited. there are tons of threads about this...just look at similar designs such as the edlebrock and read posts on that, for most builds a skunk 2 or itr manifold will work the best.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soccerking3000 &raquo;</TD></TR><TR><TD CLASS="quote">i doubt obx has that capability but if they copy a manifold that has been proven to have nice gains on engines and has the reputation to back it up, then wont the obx perform the same, maybe not last as long, but at least have similar gains?</TD></TR></TABLE>

I've never seen any information that shows how a Venom works on a D series over the stock intake. Do you know where I could find some info on this?

 

it was an assumption that a manifold that has 70% better efficiency than the stock manifold would have much better gains, the venom is recommended for FI or heavily modified NA applications, so i think that the manifold would be good for any turbo motor where the air is being forced into the engine as apposed to being sucked into the engine where velocity has a large impact on how much air enters. I don't know if this is the same but its like the scavenging affect for exhaust, for turbo apps, the larger runners would should have gains because the velocity isn't as much of a factor while NA they have to be sized appropriately to have the maximum velocity and there for gains

 

I've heard that line of BS before but never see any proof.

 

what the scavenging affect? or the better effiecny

 

im forced induction and i put on the Skunk2 last night and i noticed a loss in torque but a good gain up top. u get what u pay for........

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soccerking3000 &raquo;</TD></TR><TR><TD CLASS="quote">what the scavenging affect? or the better effiecny
</TD></TR></TABLE>

Just better.....like a dyno before and after and what the setup is. Thats what everyone wants to know. You can't really tell the efficency unless its dyno'd and the readout tells you the volumetric effeciency, but then its on the whole package.

 

the money could def be better spent...IE: tuning, or routie maintence...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soccerking3000 &raquo;</TD></TR><TR><TD CLASS="quote">it was an assumption that a manifold that has 70% better efficiency than the stock manifold would have much better gains, the venom is recommended for FI or heavily modified NA applications, so i think that the manifold would be good for any turbo motor where the air is being forced into the engine as apposed to being sucked into the engine where velocity has a large impact on how much air enters. I don't know if this is the same but its like the scavenging affect for exhaust, for turbo apps, the larger runners would should have gains because the velocity isn't as much of a factor while NA they have to be sized appropriately to have the maximum velocity and there for gains </TD></TR></TABLE>

Generally speaking, this is very correct. As far as being 70% more efficient goes, that's all relative and is vague at best. It could mean that at 7500 rpm it is 70% more efficient than a stock manifold. What it doesn't indicate is that at 2500 rpm it could be 70% LESS efficient than a stock manifold. If the car is forced induction a manifold like the OBX and VENOM will tend to perform better than on a NA engine because of it's configuration. Skunk2, ITR, BLOX and AEBS and the Edelbrock longer runner manifolds will tend to perform better on all motor street cars.


Modified by 00Red_SiR at 12:43 AM 2/11/2005

 

I also have a problem with the 70% more efficient.

Usually, when talking about efficiency with dyno performance, you are talking volumetric efficiency of the engine. A stock engine is somewhere on the lines of 80-90% range on volumetric efficiency. Then as the motor gets built and you upgrade parts and start making a lot more power with the same displacement you can get 100-120% volumetric efficiency. (these numbers are very ballpark, just used as an example)

But to increase efficiency 70%, they are deffinately talking about something other than volumetric efficiency and its probably a number not related to power gains.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 00Red_SiR &raquo;</TD></TR><TR><TD CLASS="quote">
If the car is forced induction a manifold like the OBX and VENOM will tend to perform better than on a NA engine because of it's configuration. Sjunk2, ITR, BLOX and AEBS and the Edelbrock longer runner manifolds will tend to perform better on all motor street cars.</TD></TR></TABLE>

Not really. I'll have to see what data I can pull up. But I have some dyno data around here that shows a VictorX manifold vs. a new "longer runner" manifold and the VictorX loses hands down on a turbo'd B16.