CUSTOM , HEADER ( 4-1 & 4-2-1 / Selection / Design / Fabrication )

[A20A1]

So I figure most of you want 4-2-1...

Well only problem for me is that I would need more die's to accomodate the different pipe diameters and that will blow the initial header cost thru the roof... subsequent headers will be cheaper.

Good news though is the 2-1 merges are easier to come by... and much more selection for me to shop around.


Decisions decisions...

[chainz]

It would sound like a motorcycle... (Harley)
You would hear the individual cylinders firing.

You wouldn't get any assistance from one cylinder creating vacuum for the other cylinder since the pipes don't merge thru/into one.

I get it! So that is why some 90's GM V6s with dual exhaust (Luminas, Grand Prix, etc.) have that gargling sound - cause you are actually hearing 2 separate 3 cylindar exhausts?

[A20A1]

yeah the more you split them apart the more it goes from a tone to a pulse.

[88Accord-DX]

It would sound like a motorcycle... (Harley)

If the Accord would sound anything like a Harley, the header would need to have the exhaust pipes coming out the side of the car back behind the front tire. LOL

[Acid X]

It'd be nice if us californians had more headers that were smog legal..

[Strugglebucket]

phuck smog legal.

run what you want and then swap the stock parts back in every two years. consider it a labor of love.

[Acid X]

Yeah, but that seems like a PITA.. Its pretty hard to put in headers with AC stuff, lol.

[gfrg88]

well just gut all that ac crap and you wont have to worry about it and that really doesnt get in the way of installing them....

[Acid X]

Have you seen my AC stuff?

No way i'd gut it, its a brand new system. haha... 1800$ ac system that was put in right before i got it.

[gfrg88]

ok, nevermind then, i really havent seen your system that well, mine doesnt work so im thinking about it, and itll be less weight for me and more room for turbo

[Acid X]

Good luck with smog, lol.

[gfrg88]

im not worried aboug smog, a couple extra bucks should do the job, trust me

[B16KILLA]

im not worried aboug smog, a couple extra bucks should do the job, trust me

I know a place that does "special" smog.

[A20A1]

I'm not sure if you've heard anywhere else, but Paeco offers a header for us.
$260.
Not sure of the design either.

Thanks, they are 4-1

The also offer an exhaust system as well... looks decent.

[A20A1]

I didn't send them an e-mail, I looked at their PDF.

It doesn't say 4-1 it says Four pipes to one collector, or something like that.

[gfrg88]

hmm, i was checking out paeco too, i noticed they have engine kits for honda 2.0, is that for our cars?? they seem too have a lot of nice parts there for us

[A20A1]

or used to have

[gfrg88]

so all those parts they "have" arent available anymore and i was getting so exited

[A20A1]

so all those parts they "have" arent available anymore and i was getting so exited

Some of them aren't

[gfrg88]

so i have to call them up for whatever i want to see IF they have it then??

[gfrg88]

after about a month or two i got an email back from them:


Giovanni -
We can furnish the engine kit for either of these cars. Please give us a
call if we can help you.
Carl at PAECO
(205) 823-7278

[A20A1]

My head will explode... I just added a few more calculations/formulas to the first post... rearanged a few posts, basicly updated it some.




The more vigorously gas molecules shake, the hotter the gas gets, and since sound cannot move faster than the velocity of gas molecules you can determine the speed of sound by the speed of molecular motion.

v = wavelength*frequency
or
v/frequency = wavelength

engine frequency = RPM*15 (really the frequency of the exhaust valve opening)


800 degrees Fahrenheit speed of sound is 1740.59 ft/s

(1740.59ft/s)/(RPM*15) = header length in feet

1 ft = 12.000 inches
1 ft = 0.3048 meters
1 in = 0.0254 meters


http://www.sengpielaudio.com/calculator-speedsound.htm

engine frequency = RPM*15





Optimal Velocity of 240-260 FPS