Hot damn, JBP equal length front header...

[JohnyG]

I hate to bring up another header thread, but these look promising

http://www.v6z24.com/jbodyforum/viewtopic.php?p=486895#486895

http://www.jbodyperformance.com/jbp_660hdrs4.jpg

http://www.jbodyperformance.com/jbp_660hdrs3.jpg

http://www.jbodyperformance.com/jbp_660hdrs2.jpg

[SappySE107]

"They're relatively the same. 24in long, all eq length into a 3" collector to an ingenius Y-pipe design at the rear of the engine. "

Damn, so close yet so far away. What RPM are these made for? 3"collector....dear god. Plus it seems they are gonna cost a shitload for "over-engineered" headers. Ill just stop, but those don't look to be very good specs other than equal length.

[v6h.o.]

similar in design as what im making, but mine will be longer....

thats even shorter than what GM used to recommend in the old power manual. what was thiers 26 or 27inch long recommended?

[SappySE107]

It was somewhere around there. I think even longer than that would be better, maybe 42" or something. I know thats gonna be hard but 24" is just short. 2.25" or 2.5" collectors depending on what the power of the engine will be, 3" is just way too big for anything short of boost.

I sound so pessimistic it seems on every header thread, im not trying to bash or anything...i just want to see a set done up close to if not perfect for these engines. Oh well, it beats manifolds by far!

[Juglenaut]

Lab Grade Stainless steel!!!!!!!! wow and kinda weird..

I recognize those butter fly clamps and the tubing form a previous job

[v6h.o.]

yeah i was going to do a 2inch collector.... or 2.25. havnt decided yet.

i mean fuck my exhaust system is a single 2.5 inch... 3 inch collectors. a bit big i'd say.

[RacerX11]

Having the larger diameter collector can help with scavenging. Generally, you have the three pipes run into a fairly large collector, then taper down to your tailpipe size. If you have the room, making a longer, larger diamter collector can help broaden the torque curve. The collector volume acts like a seconday pipe volume, very similar to stepped-tube headers.

I am running 2-1/2" collectors on mine, then down into 2-1/4" pipes.

Another thing to consider is if they are using formed collectors instead of welded, the 3" will allow a smoother transition. Most formed collectors transition very quickly from the individual tubes to the single collector diameter, which hurts velocity and flow. The larger diamter would make for a smoother transition. The welded collectors have such a smooth transition, you really wouldn't need the larger size.

Marty

[v6h.o.]

interesting...

well maybe its a good thing i havnt bought my collectors just yet... might just go with 2-1/2 then. idealy i'd like to fit the longest smoothest tapered collector in there when i build them but i'll have to see how much room i have.

Marty whats your thoughts about the Burns Stainless style of using a small taper transistion (not the large megaphone setup for no tailpipes) after the collector for a tailpipe equipped vehicle?

http://www.burnsstainless.com/MergeCollectors/mergecollectors.html

[RacerX11]

Everything I have read indicates those style of collectors help. The two problems are the price (if you buy from Burns, not so bad if you make your own), and packaging. Most cars don't have room to package either the larger, longer standard collector, or the merge-style collectors. If you can fit it, I would say go for it.

Marty

[v6h.o.]

so if you were going to use the taper transistion after the collector what type of size of collector would you go with? i mean your going from smaller diameter right after the collector and tapering up larger for the tailpipes...

[Anonymous]

Mine are using a 2.25" collector. And it is a pretty decent "setup" for a collector. I am very happy with them.

For those who do not know...

Mine are equal length, 30"
1 5/8" priamary collected into dual 2 1/4" pipes, which collect into a single 2.5"
6" 3-1 2 1/4" collector
Ceramic coated in silver


They are awesome, I havn't posted the finished pics and I probly won't. I have spent over 1200$, and they still could use a few more things. But it is worth it, becuz this 3.4 sounds so fucking mean it isn't even funny. And the power, ohhhhhh the power....

[SappySE107]

Yeah, and the pushrods need longer tubes than the DOHC because they don't rev as high or have the same high RPM powerband (ok, most dont). A longer collector wouldn't hurt though. I still think 3" is too much, unless its a major design change from what the headers by ed collectors are and they need it for whatever reason. Looks like burns has the same type collectors that form a + in the center from tapering the tubes inside instead of being all round and welded in the center. That would mess up the pulses though with that type transition.

[v6h.o.]

well here is the Pic of the Rear header Un-Finished, while it was being made...

i guess Mev says thats a temporary flange on the head this was a pic of his build progress. they are done and supposedly look killer.

you can see the Collector in this pic.

its not so much a big mearging collector as i thought. more so just dumping into a 3inch....

Thoughts?

[RacerX11]

Yep....that is a formed 3" collector. They basically take the 3" pipe, heat it up, and form the end into a three leaf clover shape. This is why anything smaller than 3" would make a really poor transition. They look pretty good. Do you know how long the 3" collector is?

A little short on the primary length, but like I have said, even less-than-perfect headers are going to be a whole lot better than the cast manifolds.

Marty