# Friend Just Finished Making Ecotec Header...

**URL:** https://forums.speedlife.net/t/friend-just-finished-making-ecotec-header/248406
**Category:** Shift518 Automotive
**Created:** [November 16, 2009, 2:00pm UTC](https://forums.speedlife.net/t/friend-just-finished-making-ecotec-header/248406 "2009-11-16T14:00:36Z")
**Posts on this page:** 1
**Showing post:** 11

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### Author: ![edubs](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/edubs/32/6565_2.png) [@edubs](https://forums.speedlife.net/u/edubs)
#### Post date: [November 17, 2009, 2:14pm UTC](https://forums.speedlife.net/t/friend-just-finished-making-ecotec-header/248406/11 "2009-11-17T14:14:00Z")

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> [@New Show on SpeedTV: Forza Motorsports Showdown](https://forums.speedlife.net/t/new-show-on-speedtv-forza-motorsports-showdown/21718/29):
>
> Just pointing it out for you that’s all. You can see the oxide “sugaring” on the inside welds, especially in the collector.

You were right. He forgot to turn on the gas when he was welding the primaries to the collector.

What would you use, as opposed to a stamped collector? From what I have heard, this collector is proven very reliable and efficient with the “star merge thing” (my technical description, lol).

> [@The MOST 'JDM' Car?](https://forums.speedlife.net/t/the-most-jdm-car/25923/35):
>
> Hey, edubs.
> 
> Do you know what does your friend’s header design base on in terms of calculations (header diameter, length and outlet sizing); and what kind of reference does he use for the such design and calculations? Does he know any good books on this subject besides “The Scientific Design of Exhaust and Intake Systems” by smith/morrison?
> 
> Thanks.

I can ask him. I know he worked with one of the world leaders in fluid dynamics for quite a few years and learned a lot from him. He definitely takes many things into consideration when he builds these. This header is almost perfectly equal length, with the exception of primary #3 (iirc) because of the way it had to run to fit correctly.

> [@12 Hour Sebring 2007 Thread](https://forums.speedlife.net/t/12-hour-sebring-2007-thread/25944/2):
>
> Nice work BTW OP.

Thanks!

No biggie on high-jacking the thread, boxer seems to have a good amount of knowledge of this stuff and that’s what we’re here for.

> [@Newman's 1986 BMW 326rb build thread.](https://forums.speedlife.net/t/newmans-1986-bmw-326rb-build-thread/22123/799):
>
> how big are the primaries, 1 7/8" ?

Dead on. 2" OD, 1-7/8" ID. Length is 14” and the collector is 6” long 2” prim to 3” DP…

 ![http://i174.photobucket.com/albums/w86/howark/RD%20Fabs%20Misc%20Portfolio/DSC06522.jpg](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/3X/a/b/ab7d866aeb8fd4a614a75f93a0d92eab3b086433.jpeg)

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