what is this?

BostonNSX · 24 March 2003

sorry guys I got a bad memory.. I forgot whats the "funnel" look thingy on engine which ppl used to cover it with golf balls are. I want to do a search but how can I search when I dont even know what is it called?

can someone tell me what is it and what does it do. ( the thingy under the circled focus )

original picture from science of speed

supergreen125 · 25 March 2003

velocity stacks?

BostonNSX · 25 March 2003

And what does it do??

Originally posted by supergreen125:
velocity stacks?

supergreen125 · 25 March 2003

to the best of my knowledge....
the funnels have a design called a venturi which increases the speed of the air entering the ports. it is the least restrictive way to get air into the ports on a normally aspirated engine. this setup is for racing engines as there is no filter element to keep dust and debris from entering the combustion chamber... that's why you see tennis balls on them when the engine is not running.

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'94 NSX black on black
'01 IS300
'93 del Sol -turbo integra powered- SOLD

BLACKL@BEL · 25 March 2003

Yep, those are individual throttle bodies.

BostonNSX · 25 March 2003

Anyone from prime done this?

nsxtasy · 25 March 2003

Originally posted by BostonNSX:
ppl used to cover it with golf balls

Originally posted by supergreen125:
you see tennis balls on them when the engine is not running.

Golf balls, or tennis balls? Inquiring minds want to know.

NSXCessive · 25 March 2003

Originally posted by BostonNSX:
I want to do a search but how can I search when I dont even know what is it called?

can someone tell me what is it and what does it do. ( the thingy under the circled focus )

original picture from science of speed

Yeah I had this done on an Integra I owned a few years back...I believe it is called "Porting". Porting is the modification of the ports of the engine, particularly the intake ports. By enlarging them, more fuel air mixture can be inhaled by the engine for more performance. This consumes more fuel and creates more emissions, so engines sold for non-racing general use by the public do not have the largest possible ports.

The existing ports are referred to as 4-port or 6-port depending on the engine model. This port compared to OEM single intake; opened larger after higher RPMs are reached, a lower torque peak can be achieved and a higher RPM horsepower peak achieved. In other words you wouldn't see and increase in performance until high RPM.

I've only seen this on circuit cars and Indy cars, with excessive high RPM 9000+. I'm sure there are more out there. I think it safe to say that NSX has a 6-Port intake. My good old Integra reline was 9600 RPM, too bad it caught on fire, I miss the Indy-Ish noises it made!

Hope this helps...

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-=RudeBoy BaBy NSX=-
[email protected]
http://www3.sympatico.ca/rramchar

[This message has been edited by RudeBoy_baby_NSX (edited 25 March 2003).]

Nimbus · 25 March 2003

Originally posted by nsxtasy:
Golf balls, or tennis balls? Inquiring minds want to know.

You guys are all wrong. It's ping pong balls!

MYNSX · 25 March 2003

Those are the motors commonly raced in Japan capable of 500+ hp w/ NO power adders.

PS...they are on the streets too.
THE REAL FAST AND FURIOUS!

That is a serious motor cost 35-50k to build including digital fuel mngmnt.system.

Very GNARLY.

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WWW.MYNSX.COM

Smoothaccel · 25 March 2003

Originally posted by Nimbus:
You guys are all wrong. It's ping pong balls!

The new model NSX has a bigger engine and uses basket balls to cover the stacks.

ACR_Motorsports · 25 March 2003

It is not called "Porting", although the engine may have had the intake and or exhaust ports "ported". The components pictured are velocity stacks that smooth out the airflow going into the individual throttle bodies(6). Stock NSXs have only one throttle body.

The engine/car pictured is a street car and not a full race engine/race car.

The expensive part of this system is the individual throttle bodies which must be controlled by a full race engine management system. You can run filters on the individual throttle bodies by utilizing an airbox(expensive) with 6 accomodating holes as seen on the JGTC GT500 Class NSXs. The engine pictured is only capable of 350-400 NA horsepower(flywheel) at most. Most of the power would be less useful on the street as the power comes on very late. It is not the same as the GT500 NSX Engines.

The individual throttle bodies can be controlled/timed independently of each other, allowing for precise adjustments for air delivery, more air flow, as well as provide a more direct/shorter path to the combustion chamber. These systems typically require extensive engine modifications/parts in order to utilize the power potential.

Originally posted by RudeBoy_baby_NSX:
Yeah I had this done on an Integra I owned a few years back...I believe it is called "Porting". Porting is the modification of the ports of the engine, particularly the intake ports. By enlarging them, more fuel air mixture can be inhaled by the engine for more performance. This consumes more fuel and creates more emissions, so engines sold for non-racing general use by the public do not have the largest possible ports.

The existing ports are referred to as 4-port or 6-port depending on the engine model. This port is opened after higher RPMs are reached, a lower torque peak can be achieved and a higher RPM horsepower peak achieved.

I've only seen this on circuit cars and Indy cars, with excessive high RPM 9000+. I'm sure there are more out there. I think it safe to say that NSX has a 6-Port intake. My good old Integra reline was 9600 RPM, too bad it caught on fire, I miss the Indy-Ish noises it made!

Hope this helps...

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www.acrmotorsports.com / 949-929-8973

[This message has been edited by ACR_Motorsports (edited 25 March 2003).]

[This message has been edited by ACR_Motorsports (edited 25 March 2003).]

NSXCessive · 25 March 2003

Originally posted by ACR_Motorsports:
It is not called "Porting", although the engine may have had the intake and or exhaust ports "ported". The components pictured are velocity stacks that smooth out the airflow going into the individual throttle bodies

As our kind friend from ACR_Motorsports has pointed out, yes they are called Velocity Stacks... seems I got my terminolgy mixed up sorry...

So back to my simpler thought above!... Velocity stacks improve the air flow into each throtle body at high RPM, thus increasing induction efficiency, and increased horsepower. Usually seen on racing engines where air filters are not needed!

My old Integra, unless you rev it up high 8000s it didn't really create much power over stock, and also had fine adjustments on timing and intake opening for best performance. Considering the cost, it really wasn't worth it, it literally went up in flames anyway!

My NSX still kicks its ass any day! So throw a tennis ball in there when your not driving around... wonder how many sets of piston rings that guy has gone thru?

"Porting" is a whole different set of golf balls...

------------------
-=RudeBoy BaBy NSX=-
[email protected]
http://www3.sympatico.ca/rramchar

[This message has been edited by RudeBoy_baby_NSX (edited 25 March 2003).]

kenjiMR · 26 March 2003

Its secret attack!

ajnsx · 26 March 2003

velocity stacks are usually only used on race engines as they are rebuilt often and long term reliability is not an issue. Non filtered (paper, foam "sock") engines are likely to succumb to nasty air-borne particles.....

Soichiro · 26 March 2003

The answer to nsxtasy's question is tennis balls. You see these strung together in units fitting the engine (6 in this case).

what is this?

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