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Reference: Intake Manifold Discussion

Engine Tech / Drivetrain DIY How-To's



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Old 01-21-2004, 12:03 PM   #1
ImportRacerFF
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Default Reference: Intake Manifold Discussion

Alot of people have been asking about intake manifolds and alot of incorrect information has been passed around so i figured i start a thread and help clear some up. Feel free to agree/disagree.



As everyone knows a good start in building an engine up is to put an intake on it. An intake allows more air to reach the engine. It also allows air to travel quicker and smoother then an air box (which is why the tube has no real bends and is the same diamater all the way to the throttle body).
From there it reaches the throttle body. Depending on the size of the throttle body depends on how quickly the air is moved into the intake manifold (then to the chambers). A larger throttle body will allow a better throttle response (less time to fill up the plenum of the intake manifold. Much like filling a water balloon from a hose, the larger the end of the hose the quicker the balloon fills.)

As the intake manifold goes there a few things to increase and watch for. One is the size of the plenum. The plenum is much like a water gun tank (remeber the yellow round bottle that was on the guns that you filled with water, same thing only this gun has four holes that shoot water). The plenum fills with air.

Now skip the runners for a second, and you have the cam, valves, and chambers (cylinders). When a full revoloution occurs the last stroke is the exhaust stroke. This means there is nothing left inside the chamber (cylinder). This creates a vacum (a very strong vacum). The air thats in the plenum is then pushed into the chamber due to this vacum. (air doesn't techincly fill up and wait since at every moment a cylinder requires air)

Air then travels through the runners of the intake manifold. This is much like a hose, Creating velocity will get the air to the chambers quicker. Also with some true physics involved when it hits the chamber it pushs against a wall (as if you ran into a wall you would be flat against it). This allows some compression even before the pistons become involved.

The different kinds of intake manifolds:
Stock Manifolds: Generally very restrictive and long runners. The plenum is generally not very round (causeing the air to bounce off in unpridictable manners) and have a small capcity. The runners and plenum aren't very smooth at all (again causing irregularities in the air flow).

Aftermarket N/A Manifolds: Much like a port and polish job the Plenum has a larger capacity and and is much smoother. They also look much like the d16y8 manifolds where the plenum is round (like the water gun tank). The runners a generally a little shorter and much more open.

Aftermarket Turbo Manifolds: When it comes to turbo all that matters is the flow (the rythem or wave motion). Its also about getting the air to the chambers as quickly as possible. Shorter runners are used for this. The shorter runners and even larger plenum are alot less effective at lower rpms (from idel to 5,000) due to the fact that the velocity is down.

The Hose Analogy: Imagine a hose with water running through it to fill a jug, someone is constantly turning the water from low running to full.
A Stock manifold is a hose that has to small of a diameter for the water to be pushed out effectivly. It works great at lower pressure but as it increases it becomes to restricted. If you were to add even more pressure it would brake the hose. (as in adding a turbo.)

A N/A Manifold would be just adding a bigger diamter hose. It works at all water pressure (not as well at low but still works fine and works even better then stock from mid to high)

A turbo is the largest diamater hose you can get. However, if the water is not on all the way it has no velocity. (works effective at high only).
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Old 01-21-2004, 12:04 PM   #2
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The Different Aftermarket Intake Manifolds:

Skunk2:

Long open runners with a small stock size plenum. The stock plenum helps with the lower rpms (2,000 - 4,000) however the from 4,000 - 5,000 a lose of power occurs due to the way the plenum is shaped (as seen in the dyno sheet at their site). From 5,000 and up the plenum and open runners allow air to create a nice velocity making more power.

Edelbrock Performer X:


Long open runners with a larger plenum. The larger plenum will not show as great of an increase as the skunk2's 2,000 - 4,000 range however will show an increase (compared to a decrease) of power from 4,000 - 5,000 and then the larger plenum and runners allow even more of an crease from the 5,000+ range.

Edelbrock Victor X:


Very short open runners with a large plenum. Due to the short runners and large plenum there is no increase (and most likely decrese) in performance from the 2,000 to 6,000 range. However from 6,000 to 10,000 range the performance is increased more then any other manifold. This is a turbo manifold and should only be used as such.


Golden Eagle And ZEX:


A square plenum and very short runners. Made mainly for nitrious and turbo. I would not recommend these unless your boosting large numbers.

An intake manifold shouldn't be done before a cam. The performer X is ok but to see the real numbers you have to do the cam and increase the duration the intake valve is open. The stock manifold generrally fills the intake stroke up and it might be a little to much with an aftermarket. My suggestion. Get a cam first.
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Old 01-21-2004, 12:38 PM   #3
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GREAT POST!!!!!!! something that i wanted to add that you kinda covered is about the runner length/plenum size in correspondence with the powerband

longer runners/smaller plenum: this usually creates a low-mid range powerband

shorter runners/larger plenum: this usually creates a powerband in the mid-upper RPM range

and all the stuff inbetween, ideally making your own IM is the best way to get exactly what you want, but there are always compromises as to what you actually put on the car
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Old 01-21-2004, 12:49 PM   #4
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so intake manifold would be a good upgrade if you want more power
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Old 01-21-2004, 12:51 PM   #5
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Quote:
Originally posted by mr_ducksauce
so intake manifold would be a good upgrade if you want more power

RE-read the post, its a good upgrade to COMPLIMENT other upgrades such as cams and higher compression or turbo
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Old 01-21-2004, 12:56 PM   #6
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yes i read that....but alot of people say its not really a big deal
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Old 01-21-2004, 12:58 PM   #7
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Quote:
Originally posted by mr_ducksauce
yes i read that....but alot of people say its not really a big deal

AND those "alot of people" who are they?


then why dont we put stage 3 cams on a stock motor if it "is not really a big deal"? come on man
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Old 01-21-2004, 01:34 PM   #8
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Excellent post, very informative.
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Old 01-21-2004, 01:36 PM   #9
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Quote:
Originally posted by gabebauman
Excellent post, very informative.
AGREED, this is sticky material
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Old 01-21-2004, 01:47 PM   #10
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is there intake manifolds for sohc engines like a d16y7?
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Old 01-21-2004, 01:50 PM   #11
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Quote:
Originally posted by rikx
is there intake manifolds for sohc engines like a d16y7?
any fuel injected engine has an intake manifold
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Old 01-21-2004, 02:11 PM   #12
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Quote:
Originally posted by rikx
is there intake manifolds for sohc engines like a d16y7?
Many d16y7 owners upgrade to the EX (d16y8) manifold.
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Old 01-21-2004, 02:14 PM   #13
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just so you know this is now stickied
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Old 01-21-2004, 02:33 PM   #14
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Old 01-21-2004, 03:02 PM   #15
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Rikx you can either upgrade your manifold to a d16y8 (the ex) which has a rounder plenum and same size runners or get the performer x which is larger capacity plenum and larger runners (and smoother). Ill sell you my d16y8 Intake manifold but it might be a months time.

*Thanks for who made this a sticky.*
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