Air Induction Systems, Voodoo, and simple test

[der affe]

i remember trying to explain that to people when i was "porting and polishing" cyl heads on the side of extra cash.

"why is the head only opened up to the gasket size?"

because it doesn't need to be any bigger for you application

"but Jim bob has a BIG welded ports in his, and when he nails it ,it goes fast and DRINKS LOTS OF GAS. it really comes on strong once you get the RPMs up there, let me tell you"

unless you drive like a tard,you will be just as fast if not faster, have power all the way through the RPMs, use less gas them Jim bob, and still have a bottom end.

if you don't like it, bring it to me and let me tune it, you can drive it again, if you are still not happy, i will do another set for free if you supply the heads and i will sell yours for you and give you the $$.

never had to take back a single head, it is some common sense, some science and physics, and a little bit of VOODOO mixed together

[DSP74]

Post some kind of real numbers. Or maybe exactly stock as delivered 20 years ago is so perfect there can be NO improvements.

[DCColegrove]

Of course alot of this goes out the window when we're talking forced induction.

[DCColegrove]

so, like in head porting you are only going out to the max size you can to maintain the velocity, then trying to get more speed by having a slightly rough or textured interior surface. by having the "rough" surface you maintain a thin layer of "air" on the outside of the OD of the runner, air flows faster over air than a hard surface

:up: Actually making the ports smaller in some cases.

So like back to the original subject...keep in mind that marketing will outsell performance every day.



there is no doubt of that, or the damn CAIs would not be so prolific.

You got that right...

[StereoInstaller1]

So like back to the original subject...keep in mind that marketing will outsell performance every day.

there is no doubt of that, or the damn CAIs would not be so prolific.

[der affe]

so, like in head porting you are only going out to the max size you can to maintain the velocity, then trying to get more speed by having a slightly rough or textured interior surface. by having the "rough" surface you maintain a thin layer of "air" on the outside of the OD of the runner, air flows faster over air than a hard surface

[DCColegrove]

Why don't you chill out a little.

Naw... I can dig it....

Controversy provokes thinking...

Well....Eventually ;) .

[Jand3rson]

lifestyle crew has you awfully uppity, post some dhno results and I'll ride your sack too.

Why don't you chill out a little.

[DCColegrove]

lifestyle crew has you awfully uppity, post some dhno results and I'll ride your sack too.

No...

I was pretty much this way long before they all started driving...

Hell...Before some of them were born.

[DCColegrove]

like a velocity stack or a venturi effect to keep the air speed up and on as straight a path as possible

Yes on the V stack to align the air initially entering the induction.

The big trick is to keep the flow accelerating in a uniform fashion from the inlet to the combustion chamber...And ultimately to the tailpipe.

The optimum is a straight line (but not a smooth bore) but not really practical under the hood.

[Farbin Kaiber]

Lyfestyle Krew has you awfully uppity, post some dhno results and I'll ride your sack too.

fixed pimp playa.

[z31maniac]

lifestyle crew has you awfully uppity, post some dhno results and I'll ride your sack too.

[der affe]

Yes kind of... It's a little bit more complicated than that.

If the induction uniformly draws more air through a larger volume it wouldn't be the case.

EDIT: I don't know if I can make sense of it to you without illustration...

.

like a velocity stack or a venturi effect to keep the air speed up and on as straight a path as possible.

i think i get your drift. i messed around with something similar, waaaay back in the mid 90's with CIS-E on VW's

[DCColegrove]

you mean this way?

Yes kind of... It's a little bit more complicated than that.

If the induction uniformly draws more air through a larger volume it wouldn't be the case.

EDIT: I don't know if I can make sense of it to you without illustration...

.

[der affe]

or can you gain more by making it a similar design, but smaller so you have more velocity VS larger bore and slower velocity

you mean this way?