Headers

[Anonymous]

This thread has been edited of the garbage posts and then re-opened. If it turns into a catfight again, people are gonna be banned. Thank you and have a nice day.

--Dave



I remember on the old forum there was a ton of info on primary size and length... Does anyone have that info still? There was a Headers By Ed pdf file too, but I seemed to have misplaced it. Can anyone shed some light on this?

[JasonZ34]

I thought we transfered over those boards. I guess not though.

[Anonymous]

No, the DB was never x-fer'd over. And I dont think it ever will be. Lots of great info is gone forever.

[brian89gp]

only thing i remember is that Johns were 45-50" long. The collector for the front head was pretty close to being below the steering rack.

[JasonZ34]

that blows goat ass

[bwawuz02]

i think that 1 5/8" primaries that are 20-25" long should work nicely. maybe 1 3/4" primaries. and going with true duals will be the easiest way. don't have to worry about room for the x-over

[Anonymous]

I thought I heard that 1-5/8" primaries were ideal with 40-48" lengths...

[Anonymous]

Does the primary lengh really matter? it was my understanding that you could collect the 3 anywhere along the way down and back.

also, since my car isnt lowered yet, think i would have ground clearence issues or not?

[Anonymous]

Primary length matters just as much as primary size.

It depends where you wanna run the pipes. Do you want them to go under the car?

http://www.brian89gp.com/misc/kickingz.jpg

That pic is of John V's car when he had his headers on. His car was lowered. Even if he wasnt lowered, he'd still have only 3" or so ground clearance. You do the math.

EDITED: That pic is too big so now its a link.

[Rhedalert]

Is that a weld job or sterling silver jewelry?

[Anonymous]

Looks like my welds!

[Ross96GTP]

Whoa, maybe it's just the pic, but what size primaries were those. It looks like 2 1/2 in the pics, hehe. But that is the truth, it's one thing to design headers, but there really is no room on our cars unless you do maybe do a shorty style header and run it through the stock crossover point with ceramic coating and heat shield the intake heavilly. Other than that, I think that pic proves that running them under the car is not a viable option.

[Anonymous]

Those primaries are HUGE.

I was hoping on going under the car, but that may be a little difficult....I will be taking a look shortly here, and do you think I should collect them before turning under the car or do it like John did?

I recently gained access to a welder and a plasma cutter and so my firend sand i are gonna try and get some headers on my car.

[Anonymous]

I think you coudl get some decent length primaries on the front if you run them in place of the stock crossover. They would have to collect before entering the stock downpipe location though. It would be VERY hard to fit that many pipes in place of one 2.5"

[Anonymous]

Ok, just got in from taking some measurements.

I pretty positive that I heard 40-48" primaries would be ideal for the DOHC, so thats my findings are based on.

I took a 45" long piece of speaker wire (closest length I could find) and I strung it out to see where it ended.

From the cylinder furthest away from the crossover (#1?) I measured 45" to be DIRECTLY under the EGR. I then measured the distance from the left cylinder to the right cylinder (#5?). They are 9-10" apart (depending on where you measure from). So, if you were to use 45" primaries, you'd have to deal with 9" more length at most in difference.

After I measured that, I measured the distance from the head to the cooling fans. The passenger side fan is about an inch bigger than the drivers side fan so I used that to measure to since it would interfere the most. I measured 4.25" or so from the head to the back of the cooling fan. After thinking, gee, thats not much room, I had an idea. What if the cooling fans were moved to the FRONT of the radiator! Eureeka! If you were to move the fans to the front of the radiator you would gain AT LEAST 3" inbetween the head and the radiator (probably closer to 4"). So, if you want to make headers, you are probably gonna either have to buy slim fans or move them to the front of the radiator (neither of which are that big of a problem).

About the difference in length between the cylinder primaries: To take up the extra length in the primaries you are probably going to have to move the battery to the trunk and then run your intake over there so that you can even out the primaries when they collect (not a problem for me ). According to the Headers By Ed pamphlet I have, for a V6 making approximately 225 - 300hp, he recommends 1-5/8" primaries (O.D.) and then having them collect into a 2" collector (for best bottom-end power--which we want/need ). I still am not sure on what collector length being perfect... does anyone know the perfect length? I think there is a long ass equation floating around... does anyone have it? I wouldn't mind doing the math.

Ok, this post is getting long, so I'll end it now.