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roughly how many peices of bends did you end up using to make those headers 30inches Aaron?
im likely doing a set with primaries around 28-34 inch long. have to do some more figuring out to determine how long they're going to be (sorry i know pushrod engine posting in the DOHC forum...)
i know that with the routing, the # of bends will be different. but want to make sure i have enough kicking around. just have to get my flanges made up sometime so i can start the build.
Colin
92 Sunbird GT, 3200 Hybrid 13.99@ 95.22 (2004)
90 Eagle Talon TSi AWD 10.54 @ 129mph.
If you are runnign a pushrod motor, I'd use a longer pipe for it optimizes low end. I made them 30" especially for the high end, and we all know how much the 3.4 loves the high end. Howver if I had had a pushrod, I would have used 1.5" pipes and 40" primaries. But you will want to use bigger than 1.5" becuz of how much power your car is making.
On the fronts there are about 4 pieces of pipe for each priamry, on the back it ranges from 3 to 8.
However if I was to build another set, I would order different piping.
I oreder 10 U-bends with liek 6 or 8 inch tails.
Then 2 J bends with different sized tails, one long, one short
After this was 4 straight 30" lengh sections of 1 5/8"
I would not have ordered the 4 straight sections, I didn't use any of them. Becuz of the complex routing of the headers needed, more curves are neccessary than straight pipes and the tails off the curves worked perfect. I also would have ordered 2 more J bends and 2 less U bends. I ended up using both the J bends(the long tails helped), 9/10 of the U bends, and none of the straight sections.
yeah im using 1-5/8ths pipes Aaron, my engine revs up to 6200 in its current state.
im not worried about low end torque really. i have enough as it is.. this is a high RPM setup with the cam that i run.
ive got 15 pieces of pipe right now. hmm. maybe i better order some more.
i dont have any straight peices as i know most of the pieces of straight pipe will be able to be used from the U and Jbends themselves.
40 inch primary's just sounds absurdly long to me. i cant find my headers by ed booklet but i know he recomends 34-36 for most app's.
Colin
92 Sunbird GT, 3200 Hybrid 13.99@ 95.22 (2004)
90 Eagle Talon TSi AWD 10.54 @ 129mph.
Ok, so if I were to make a set with each primary about 6 inches longer, what would you suggest for parts. 4 J bends, all long tails, 8 U bends and no straight pipe. Maybe I can make use of the straight pipe then.
Ben if I were you I would get maybe 6 J bends, they come in really handy, more so than the U bends I found, and 8 U bends and no straights. There is plenty of straight pipe included on the bends themselves, I'll get a pic of a U bend a little later. But design them so that they collect right over the tranny like I did, it makes the install a lot easier and it makes the 3 bolt flange easy to get to.
v6h.o., Ed recomended 40"+, he says going shorter is pointless. He said a good set of headers offers power all through the curve, from 1500 to redline. I chose to go short 1 for ease of the build, and 2 I could care less about the low end. He was a firm believer that longer is better. He only has a few prebuilt sets of headers, and the corvette stingrays use like 50" primaries, and he said they still gianed all of the way to redline.
I ordered EXACTLY:
10 U bends(I have 1 extra) 1 5/8"
2 J bends(Wish I had more) 1 5/8"
4 X 30" straight sections(useless) 1 5/8"
2 J bends (Don't know yet) 2 1/4"
2 X 30" staight sections(Probly Useless) 2 1/4"
2 3-bolt flanges at 2 1/2" with gasket
4 3-bolt flanges at 2 1/4" with gaskets
2 custom 3 into 1 collectors, 2 1/4"
It is hard to comprehend what I am doing exactly, I will have pics of the rears soon, but I have yet to build the downpipe.
Wow, looks great Aaron! I might have to stop giving you shit all the time now! Just a comment on the chrome though, why not have them ceramic coated inside and out? It will cut the heat radiation from the headers, and keep the velocity up, helping with scavaging. Also IIRC you can get ceramic coat that looks like chrome. Another thing I would have rather done is remove that stupid fake firewall (the rubber one) because there is about 1 1/2 inches or so from the block to the real firewall gained if it is removed. You might get a little more engine noise in the car, but who here really cares about engine noise in the car that wants to go faster? Another thing I would have rather done instead of cutting a hole in the subframe (not knocking you on it, as long as it works fine) is maybe take a persuader (read hammer) to the firewall where the bump is for the exhaust After all, that part is under carpet inside the car, and there is an airgap between the engine bay firewall sheet metal, and the passenger cabin firewall sheet metal. Any one who has done a 5 speed swap can tell you this because you find out when you go to run the shifter cables through it (have to use a hole saw inside the car, and punch the perforated section out under the hood). Still though, good deal, and congrats!
-60v6's 2nd Jon M.
91 Black Lumina Z34-5 speed 92 Black Lumina Z34 5 speed (getting there, slowly... follow the progress here)
94 Red Ford Ranger 2WD-5 speed
Mine aren't nearly 10", they are 6. But 10 would be hard, especially with 40" primaries. You'd need to do a lot of turning to get length in front of the motor. And that means more space gets taken up. For a 10" collector you'd want them to collect right after they turn over the tranny. That would be tough. Mine collect right over the 2 upper bolts for the tranny.
UPDATE-The rear headers are a bitch. I was thinking the fronts were gonna be hard, rears easy. So I get them all welded up, after redesigning all 3 primaries, and try to put them in. OMFG. So I pull the drive axle to where it is almost out, just sticking like 1/2" through the engine mount thingy. Then I try to get it up there. No can do. So I pull all 6 studs, the Knock sensor, both shift cables, and both PS lines. After all this and some crafty manuevering, it goes up. Uh Oh. My #1 primary runs right where the drive axle goes. I thought for sure it would clear, but not even close. the axle would go right through it. SO I took it off and today I have to cut it up and reroute one of the primaries. This fuckign thing is a bitch and I hate it. Why the fuck did I get this stupid idea of making headers???
Because of the gains and everyone else wants them maybe?
-60v6's 2nd Jon M.
91 Black Lumina Z34-5 speed 92 Black Lumina Z34 5 speed (getting there, slowly... follow the progress here)
94 Red Ford Ranger 2WD-5 speed
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