anyone ever hear 8 into 1 headers in person or know info about.

[paul.m]

You are right about nascar, they were not worth the trouble and the other part was there just was not a significant enough difference in horsepower at the r p m range that nascar engines run ! You better believe Hendricks , penske, and all the other big names would be running them if they were worth it, These gain interest about every 10 yrs or so and then they fade away , they have been making these since the 50,s ! They actually work more on exhaust pulse then anything , it get,s in depth if you really research it . Basicaly IMO on a street car they always look like 10 lbs of s--t in a 5 pound bag

 

[jlcustomz]

I've done that light read on the c-5 vette a good while back, nice fabwork, but I can't & won't go his route. I am planning the upswept & getting some more under the hood room, moving radiator again. I got time to play with fitment here & there before I'll have the real time to fab.
Already planning hood vents, may even consider having my exhaust cutout through a hood vent. Maybe?

 

[jlcustomz]

Got a little more info from a desert racing forum. Supposedly the 8 into 1 merges loose a little torque & a properly configured 180 setup, especially with my tri-y type 2 into 1 collector setups, can give the same sound. confirmed the correct sequence to run the pipes. So just figuring out my routing now, hopefully I can sound close to as good as this c-5.

 

[pontiacgp]

That sounds too much like the formula 1 cars.....this is the sound I like...

.

 

[fleming442]

Got a little more info from a desert racing forum. Supposedly the 8 into 1 merges loose a little torque & a properly configured 180 setup, especially with my tri-y type 2 into 1 collector setups, can give the same sound. confirmed the correct sequence to run the pipes. So just figuring out my routing now, hopefully I can sound close to as good as this c-5.

Just comparing notes: what did you find for the collector/pipe arrangement?
Mine was stack the 1st half of the firing order over the second half, then split that down the middle. So, on an Olds: 1 8 4 3 6 5 7 2
You stack
1 8 4 3
6 5 7 2
And split
18. 43
65. 72

 

[jlcustomz]

I understand you pair the cylinders firing 180 degrees to get the sound. I'm doing 8-4-2-1 merges.
LS1 firing order 18726543, I pair 1-6, then 7-4 , which then merge together. Then pair 8-5 & 2-3 , then they merge. If twin 4 into one collectors, I've seen 1&7 over 6&4 then 3 & 5 over 2 &8.
I think the 8-4-2 merge collector setup would give the most purest sound. Not sure about going into 1 then back to duals or staying split. I'm thinking into 1.

 

[pontiacgp]

sounds good, got any pictures of what you have done so far?

 

[jlcustomz]

I mentioned in post #1 that I was considering this for a future project, gotta get the widebody project put together before I can tear something else apart. Besides that holding me back, I really needed to find out more info that not too many people don't know about, now I'm about there except for how to route things.
Playing with a pair of collector ends for a possible over engine routing, similar to internet 8 into 1 pic. As seen in pic here they could exit down space to front pass side if I make them curve down, probably with multiple pie cuts.
I do want to get a design nailed down soon so I can collect other needed parts.

 

[jlcustomz]

Option 2 would be running up sides , similar to turbo headers, then wrapping around front and merges pointing down , then existing pass side. This would involve moving radiators forwards at least 4 ". Headers could start out with routing similar to the NRE stainless headers pictured to help obtain near equal length needed for best sound.
With this method to connect from both sides, primary pipes would be getting kinda long, like 42". Might not be too bad a deal for a mild street engine, but would be more work to make happen correctly.

 

[jlcustomz]

Here 's a few pics of possible rough arrangement of reused tri-y collectors for 180 headers. I think all 8 flat in a row may look best.
Gonna do more hood vents anyways, thinking about a functional version of the 80's iroc hood vents if not having the entire center be louvers..