A fourm member bought a SSAC header, and apparently, from the looks, it has a 2.5" downpipe... I cannot 100% verify, but this is why I am asking YOU.

This is a picture of the 2.5" from SSAC
http://www.sr20forum.com/gallery/data/523/untitled.JPG



This is what some one sent me on the forum..
http://www.sr20forum.com/gallery/data/523/SSACHeader001.jpg
http://www.sr20forum.com/gallery/data/523/SSACHeader002.jpg
http://www.sr20forum.com/gallery/data/523/SSACHeader005.jpg
http://www.sr20forum.com/gallery/data/523/SSACHeader004.jpg
http://www.sr20forum.com/gallery/data/523/SSACHeader003.jpg


anyone care to speculate, I don't HAVE a 2" header to compare right now so I cannot confirm this...

Just from that second picture, the downpipe looks beefier. I'd say its a 2.5"

again, the TOP picture is what SSAC sent me, and the other pics are what a user BOUGHT off of ebay...

They look, the same exact diameter, if this is the case, we should be GO:biggthump

I'll check with SSAC, but I won't get a response until Tuesday:squint:

? so they decided to start selling on ebay before finishing off your GB farmboss?

the secondarys are still tiny.

the secondarys are still tiny.they are, but there are TWO. At first glance you would think they don't flow much, but they are each 1.75" in diameter. Total, that is over 3"...


3" is the same 3" as having a turbo 3" downpipe.

they are, but there are TWO. At first glance you would think they don't flow much, but they are each 1.75" in diameter. Total, that is over 3"...


3" is the same 3" as having a turbo 3" downpipe.

hehe sorry farmboss, when talking about flow within piping we are dealing with area of the circle, not diameter.

3" diameter = Pi*R^2 = 7.1 square inches
1.75" diameter twice = 2 * ( Pi*R^2) = 4.8 square inches
2.5" diameter = Pi*R^2 = 4.9 square inches

so there you have it, it's a TAD bit smaller than a 2.5" pipe.

that being said i am ordering one tonight. :)

hehe sorry farmboss, when talking about flow within piping we are dealing with area of the circle, not diameter.

3" diameter = Pi*R^2 = 7.1 square inches
1.75" diameter twice = 2 * ( Pi*R^2) = 4.8 square inches
2.5" diameter = Pi*R^2 = 4.9 square inches

so there you have it, it's a TAD bit smaller than a 2.5" pipe.

that being said i am ordering one tonight. :)no no no, you overcomplicated it. Simply, the downpipe is 2.5" WIDE, and each secondary is 1.75" WIDE. is that dumbed down enough? 1.75 WIDE + 1.75 WIDE= 3.5 WIDE

WIIIIIIIIIDE

no no no, you overcomplicated it. Simply, the downpipe is 2.5" WIDE, and each secondary is 1.75" WIDE. is that dumbed down enough? 1.75 WIDE + 1.75 WIDE= 3.5 WIDE

WIIIIIIIIIDE

we are talking about how much air will flow through that, right?

think about it again man. two 1.5" pipes, the diameter will equal 3", but if you hold the two 1.5" pipes next to eachother and next to a 3" pipe is it EASY to see that they wont flow nearly as much.

The area of a circle can be found by multiplying pi ¶ (which is equal to 3.14) by the square of the radius

If a pipe has a width of 1.75,
radius= diameter/2 so 1.75/2= .875
its cross section(area of circle) is 3.14*.875^2=2.404

If you have two of those then 2.404*2= 4.808 in2

One 3in diameter pipe
R=1.5
3.14*1.5^2= 7.065 in2

that mean that the 2 smaller pipes have a 68% smaller cross section than the one 3in. pipe.

so long story short two smaller pipes will NOT flow as much as one larger, in this case.

FarmBoss - i don't mean to flame or anything just wanted the correct info out there.

*edit for units in calc*
and Tiaden beat me to it while i was doing math

we are talking about how much air will flow through that, right?

think about it again man. two 1.5" pipes, the diameter will equal 3", but if you hold the two 1.5" pipes next to eachother and next to a 3" pipe is it EASY to see that they wont flow nearly as much.ack, i think you're right.

Well anyway, i don't see the sizing of their secondaries to be the worst design flaw, i hate the horrific looking merge more:rofl:


BUT, simple usually works, and being complicated doesn't gaurantee durability.


so long story short two smaller pipes will NOT flow as much as one larger, in this case.

FarmBoss - i don't mean to flame or anything just wanted the correct info out there.don't worry about it i'm still a little wasted from last night...

hehe sorry farmboss, when talking about flow within piping we are dealing with area of the circle, not diameter.

3" diameter = Pi*R^2 = 7.1 square inches
1.75" diameter twice = 2 * ( Pi*R^2) = 4.8 square inches
2.5" diameter = Pi*R^2 = 4.9 square inches

so there you have it, it's a TAD bit smaller than a 2.5" pipe.

that being said i am ordering one tonight. :)

LoL, i just had the machinists handbook infront of me figuring all this out myself, till i figured, why am i wasting my time. They are only going to argue.

who cares, its a cheap header..with this said, does anyone have the part number for it on ebay? i can never find one:(

I'll tell you what impresses the heck out of me... 3 of you used your brains to figure out the differences in flow potential. And, backed it up with the correct math.

Ain't nothing wrong with the new generation of owners... at all.

Peace,
Mark

I'll tell you what impresses the heck out of me... 3 of you used your brains to figure out the differences in flow potential. And, backed it up with the correct math.

Ain't nothing wrong with the new generation of owners... at all.

Peace,
Mark

That made me smile. :)

My intention wasn't to ditch on the SSAC header, but instead to get the correct info out there for future project planners.

I ordered my SSAC header from ebay last night. Just type in 200sx header in the search box on ebay and you should see it. Ill post some pics if you guys want when i recieve it.

That made me smile. :)

My intention wasn't to ditch on the SSAC header, but instead to get the correct info out there for future project planners.

Same here, I love my SSAC!! I even put one on my brother's car.

I'll tell you what impresses the heck out of me... 3 of you used your brains to figure out the differences in flow potential. And, backed it up with the correct math.

Ain't nothing wrong with the new generation of owners... at all.

Peace,
Mark

cheers to that!

ok i just skipped over all that mumbo jumbo. all i know isthe header has 1 7/8 primarys. which 2 of them collect into a single 1 3/4 which 2 of those collect into a single 2". my header is 2" secondarys into a 2.5" collector. my ve header will be 2 1/4" seconds into a 3" collector. should make for a top end beast. but only if ur running cams.

So yeah if you can find out if you can get the front pipes, that would kick ass!! If not we gonna see another group buy for the 2.5"? Gotta gotta have it!